CN116609643B - Signal detection circuit and integrated circuit - Google Patents
Signal detection circuit and integrated circuit Download PDFInfo
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- CN116609643B CN116609643B CN202310896914.XA CN202310896914A CN116609643B CN 116609643 B CN116609643 B CN 116609643B CN 202310896914 A CN202310896914 A CN 202310896914A CN 116609643 B CN116609643 B CN 116609643B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2851—Testing of integrated circuits [IC]
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K5/22—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral
- H03K5/24—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral the characteristic being amplitude
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Abstract
The invention discloses a signal detection circuit and an integrated circuit. The signal detection circuit comprises a comparison module, an adjusting module and a logic judging module; the comparison module is used for comparing the signal to be detected with the first reference signal and the second reference signal; the control end of the adjusting module is connected with the output end of the comparing module, the output end of the adjusting module is connected with the input end of the comparing module, and the adjusting module is used for reversely adjusting the signal to be detected when the signal to be detected exceeds the range of the first reference signal and the second reference signal; the input end of the logic judgment module is connected with the output end of the comparison module, and the logic judgment module is used for outputting an abnormal detection signal when the signal to be detected exceeds the range of the first reference signal and the second reference signal. When the amplitude of the signal to be detected exceeds the fluctuation threshold, the adjusting module reversely adjusts the signal to be detected so as to reduce the fluctuation amplitude of the signal to be detected and improve the fluctuation bearing capacity of the signal detecting circuit.
Description
Technical Field
The embodiment of the invention relates to the technical field of signal detection, in particular to a signal detection circuit and an integrated circuit.
Background
In an integrated circuit, the signal can be detected so that the signal outputs an abnormal signal when the amplitude is too high or too low, thereby ensuring the stability of the integrated circuit.
Disclosure of Invention
The invention provides a signal detection circuit and an integrated circuit, which are used for improving the capability of the signal detection circuit to bear fluctuation.
In a first aspect, an embodiment of the present invention provides a signal detection circuit, including a comparison module, an adjustment module, and a logic judgment module;
the input end of the comparison module is used for inputting a signal to be detected, the first reference signal input end of the comparison module is used for inputting a first reference signal, the second reference signal input end of the comparison module is used for inputting a second reference signal, and the comparison module is used for comparing the signal to be detected with the first reference signal and the second reference signal; the control end of the adjusting module is connected with the output end of the comparing module, the output end of the adjusting module is connected with the input end of the comparing module, the input end of the adjusting module is connected with the fixed potential end, and the adjusting module is used for reversely adjusting the signal to be detected when the jump of the signal to be detected exceeds the range of the first reference signal and the second reference signal; the input end of the logic judgment module is connected with the output end of the comparison module, the output end of the logic judgment module is used as the output end of the signal detection circuit, and the logic judgment module is used for outputting an abnormal detection signal when the signal to be detected exceeds the range of the first reference signal and the second reference signal;
the comparison module comprises a first comparison unit and a second comparison unit, and the adjustment module comprises a first adjustment unit and a second adjustment unit;
the negative input end of the first comparison unit and the positive input end of the second comparison unit are used as input ends of the comparison module, the positive input end of the first comparison unit is used as a first reference signal input end of the comparison module, the negative input end of the second comparison unit is used as a second reference signal input end of the comparison module, the output end of the first comparison unit is connected with the control end of the first adjustment unit and the first input end of the logic judgment module, the output end of the first adjustment unit is connected with the negative input end of the first comparison unit, the input end of the first adjustment unit is connected with a first potential input end, the first adjustment unit is used for comparing the size of the signal to be detected and the first reference signal, and the first adjustment unit is used for pulling down the signal to be detected when the signal to be detected jumps more than the first reference signal; the output end of the second comparison unit is connected with the control end of the second adjustment unit and the second input end of the logic judgment module, the output end of the second adjustment unit is connected with the positive input end of the second comparison unit, the input end of the second adjustment unit is connected with the second potential input end, the second comparison unit is used for comparing the size of the signal to be detected with the size of the second reference signal, and the second adjustment unit is used for pulling up the signal to be detected when the jump of the signal to be detected is smaller than that of the second reference signal; the logic judgment module is used for outputting the abnormal detection signal when the signal to be detected is larger than the first reference signal and/or when the signal to be detected is smaller than the second reference signal; wherein the amplitude of the first reference signal is greater than the amplitude of the second reference signal;
the logic judgment module comprises a NAND logic device;
the first input end of the NAND logic device is used as the first input end of the logic judging module, the second input end of the NAND logic device is used as the second input end of the logic judging module, and the output end of the NAND logic device is used as the output end of the logic judging module.
Optionally, the first comparing unit includes a first comparator; the positive phase input end of the first comparator is used as the positive input end of the first comparison unit, the negative phase input end of the first comparator is used as the negative input end of the first comparison unit, and the output end of the first comparator is used as the output end of the first comparison unit;
and/or the second comparing unit comprises a second comparator; the positive phase input end of the second comparator is used as the positive input end of the second comparison unit, the negative phase input end of the second comparator is used as the negative input end of the second comparison unit, and the output end of the second comparator is used as the output end of the second comparison unit.
Optionally, the first regulation unit comprises a first controllable current source; the control end of the first controllable current source is used as the control end of the first adjusting unit, the input end of the first controllable current source is used as the input end of the first adjusting unit, and the output end of the first controllable current source is used as the output end of the first adjusting unit;
and/or the second regulating unit comprises a second controllable current source; the control end of the second controllable current source is used as the control end of the second adjusting unit, the input end of the second controllable current source is used as the input end of the second adjusting unit, and the output end of the second controllable current source is used as the output end of the second adjusting unit.
Optionally, the signal detection circuit further comprises a filtering module;
the filtering module is connected between the comparing module and the logic judging module and is used for filtering the comparison signal output by the comparing module.
Optionally, the filtering module includes a first filtering unit and a second filtering unit;
the first filtering unit is connected between the first comparing unit and the first input end of the logic judging module, and is used for filtering the first comparing signal output by the first comparing unit; the second filtering unit is connected between the second comparing unit and the second input end of the logic judging module, and is used for filtering a second comparison signal output by the second comparing unit.
Optionally, the first filtering unit includes a first resistor and a first capacitor; the first end of the first resistor is connected with the output end of the first comparison unit, the second end of the first resistor is connected with the first pole of the first capacitor and the first input end of the logic judgment module, and the second pole of the first capacitor is connected with the grounding end;
and/or the second filtering unit comprises a second resistor and a second capacitor; the first end of the second resistor is connected with the output end of the second comparison unit, the second end of the second resistor is connected with the first pole of the second capacitor and the second input end of the logic judgment module, and the second pole of the second capacitor is connected with the grounding end.
In a second aspect, an embodiment of the present invention further provides an integrated circuit, including the signal detection circuit in the first aspect.
According to the technical scheme, the control end of the adjusting module is connected with the output end of the comparing module, and the output end of the adjusting module is connected with the input end of the comparing module. When the amplitude jump of the signal to be detected exceeds the range between the first reference signal and the second reference signal, the comparison signal output by the comparison module jumps, and the adjustment module adjusts the signal to be detected reversely according to the action of the falling edge of the comparison signal, so that the signal to be detected changes to the range between the first reference signal and the second reference signal after jumping, the fluctuation amplitude of the signal to be detected can be reduced, and the capability of the signal detection circuit for bearing fluctuation is improved.
Drawings
Fig. 1 is a schematic diagram of a signal detection circuit according to the related art;
fig. 2 is a schematic structural diagram of a signal detection circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of another signal detection circuit according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Fig. 1 is a schematic diagram of a signal detection circuit according to the related art. As shown in fig. 1, the signal detection circuit includes a first transistor M1, a first current mirror K1, a second transistor M2, a second current mirror K2, a first current source I1, a second current source I2, an inverter F1, and a nand logic N1. The specific connection relationship is shown in fig. 1, and the first current provided by the first current source I1 is relatively small, which can be regarded as logic 0. The second current provided by the second current source I2 is relatively large and may be considered as a logic 1. In the process of the signal detection circuit, when the difference between the input signal VIN and the gate voltage VCM1 of the first transistor M1 is smaller than the threshold voltage of the first transistor M1, the first transistor M1 is turned on, the first current mirror K1 outputs a current signal to the input terminal of the inverter F1, and at this time, the first current mirror K1 can pull up the first current provided by the first current source I1, so that the input terminal of the inverter F1 inputs a signal with logic 1, and outputs the signal to one terminal of the nand logic N1 after being inverted by the inverter F1, and at this time, the nand logic N1 outputs an abnormality detection signal of logic 1. When the difference between the input signal VIN and the gate voltage VCM2 of the second transistor M2 is greater than the threshold voltage of the second transistor M2, the second transistor M2 is turned on, the second current mirror K2 outputs a current signal to the output terminal of the second current source I2, and pulls down the second current provided by the second current source I2, so that the other end of the nand logic device N1 inputs a signal with logic 0, and at this time, the nand logic device N1 outputs an anomaly detection signal with logic 1. Wherein the gate voltage VCM1 of the first transistor M1 and the gate voltage VCM2 of the second transistor M2 are equal. When the difference of the input signal VIN from the gate voltage VCM1 of the first transistor M1 or the gate voltage VCM2 of the second transistor M2 is greater than the threshold voltage of the first transistor M1 and less than the threshold voltage of the second transistor M2, the first transistor M1 and the second transistor M2 are turned off, and the first current mirror K1 and the second current mirror K2 cannot output current. At this time, the first current source I1 provides a first current to the input terminal of the inverter F1, so that the input terminal of the inverter F1 inputs a signal with logic 0, and outputs the signal to the nand logic device N1 after being inverted by the inverter F1, i.e. one end of the nand logic device N1 inputs a signal with logic 1. Meanwhile, the second current source I2 provides a second current to the other end of the nand logic device N1, i.e. the other end of the nand logic device N1 inputs a signal with logic 1, and at this time, the nand logic device N1 outputs a normal detection signal with logic 0. Whereby the amplitude variation of the input signal VIN can be detected.
In the above process, when the variation range of the input signal VIN exceeds the fluctuation threshold, that is, exceeds the threshold voltages of the first transistor M1 and the second transistor M2, the detection signal output by the signal detection circuit is abnormal, so that the capability of the signal detection circuit for carrying the fluctuation is weak.
Aiming at the technical problems, the embodiment of the invention provides a signal detection circuit. Fig. 2 is a schematic structural diagram of a signal detection circuit according to an embodiment of the present invention. As shown in fig. 2, the signal detection circuit includes a comparison module 110, an adjustment module 120, and a logic determination module 130; the input end Vin1 of the comparison module 110 is used for inputting a signal to be detected, the first reference signal input end VREF1 of the comparison module 110 is used for inputting a first reference signal, the second reference signal input end VREF2 of the comparison module 110 is used for inputting a second reference signal, and the comparison module 110 is used for comparing the signal to be detected with the first reference signal and the second reference signal; the control end CTRL of the adjusting module 120 is connected with the output end OUT1 of the comparing module 110, the output end OUT2 of the adjusting module 120 is connected with the input end Vin1 of the comparing module 110, the input end Vin2 of the adjusting module 120 is connected with the fixed potential end VI, and the adjusting module 120 is used for reversely adjusting the signal to be detected when the signal to be detected jumps beyond the range of the first reference signal and the second reference signal; the input terminal Vin3 of the logic determination module 130 is connected to the output terminal OUT1 of the comparison module 110, the output terminal of the logic determination module 130 is used as the output terminal OUT3 of the signal detection circuit, and the logic determination module 130 is configured to output an abnormal detection signal when the signal to be detected exceeds the range of the first reference signal and the second reference signal.
The comparison module 110 includes a first comparison unit 111 and a second comparison unit 112, and the adjustment module 120 includes a first adjustment unit 121 and a second adjustment unit 122; the negative input end IN 1-of the first comparison unit 111 and the positive input end In2+ of the second comparison unit 112 serve as the input end Vin1 of the comparison module 110, the positive input end In1+ of the first comparison unit 111 serves as the first reference signal input end VREF1 of the comparison module 110, the negative input end IN 2-of the second comparison unit 112 serves as the second reference signal input end VREF2 of the comparison module 110, the output end OUT11 of the first comparison unit 111 is connected with the control end CTRL1 of the first adjustment unit 121 and the first input end Vin31 of the logic judgment module 130, the output end OUT21 of the first adjustment unit 121 is connected with the negative input end IN 1-of the first comparison unit 111, the input end Vin21 of the first adjustment unit 121 is connected with the first potential input end VI1, the first comparison unit 111 is used for comparing the size of a signal to be detected and the first reference signal, and the first adjustment unit 121 is used for pulling down the signal to be detected when the signal to be detected jumps more than the first reference signal; the output end OUT12 of the second comparing unit 112 is connected with the control end CTRL2 of the second adjusting unit 122 and the second input end Vin32 of the logic judging module 130, the output end OUT22 of the second adjusting unit 122 is connected with the positive input end in2+ of the second comparing unit 112, the input end Vin22 of the second adjusting unit 122 is connected with the second potential input end VI2, the second comparing unit 112 is used for comparing the magnitude of the signal to be detected and the magnitude of the second reference signal, and the second adjusting unit 122 is used for pulling up the signal to be detected when the jump of the signal to be detected is smaller than the second reference signal; the logic judgment module 130 is configured to output an abnormal detection signal when the signal to be detected is greater than the first reference signal and/or when the signal to be detected is less than the second reference signal; wherein the amplitude of the first reference signal is greater than the amplitude of the second reference signal.
The logic determination module 130 includes a nand logic;
the first input terminal of the nand logic device is used as the first input terminal Vin31 of the logic determination module 130, the second input terminal of the nand logic device is used as the second input terminal Vin32 of the logic determination module 130, and the output terminal of the nand logic device is used as the output terminal OUT3 of the logic determination module 130.
Specifically, the signal to be detected may be a voltage signal. The first reference signal and the second reference signal define a fluctuation threshold of the signal to be detected, wherein a smaller reference signal between the first reference signal and the second reference signal is used as a lower limit of a normal fluctuation threshold of the signal to be detected, and a larger reference signal between the first reference signal and the second reference signal is used as an upper limit of the normal fluctuation threshold of the signal to be detected. The comparison module 110 may compare the magnitude of the signal to be detected with the first reference signal and the second reference signal. When the amplitude of the signal to be detected is stabilized between the first reference signal and the second reference signal, the adjusting module 120 does not act according to the comparison signal output by the comparing module 110. Meanwhile, the logic judging module 130 may output a normal detection signal according to the comparison signal. When the amplitude jump of the signal to be detected exceeds the range between the first reference signal and the second reference signal, the comparison signal output by the comparison module 110 jumps, and the adjustment module 120 adjusts the signal to be detected reversely according to the action of the falling edge of the comparison signal, so that the signal to be detected changes to the range between the first reference signal and the second reference signal after the jump, thereby reducing the fluctuation amplitude of the signal to be detected and improving the capability of the signal detection circuit for bearing the fluctuation. After the adjusting module 120 adjusts the signal to be detected according to the comparison signal in an opposite phase, if the amplitude of the signal to be detected still exceeds the range between the first reference signal and the second reference signal, the logic judging module 130 outputs an abnormal detection signal according to the comparison signal.
For example, when the signal to be detected is greater than the second reference signal and less than the first reference signal, the first comparing unit 111 outputs a first comparing signal with logic 1, and the second comparing unit 112 outputs a second comparing signal with logic 1, and the two input terminals of the nand logic device input signals with logic 1, and the nand logic device outputs normal detection signals with logic 0.
The first potential provided by the first potential terminal VI1 may be a low level. Illustratively, the first potential terminal VI1 may be a ground terminal. When the signal to be detected has a jump and the transient jump voltage is greater than the first reference signal, the first comparing unit 111 outputs a first comparing signal with logic 0, and the first adjusting unit 121 pulls down the signal to be detected according to the falling edge of the first comparing signal, so that the fluctuation amplitude of the signal to be detected is reduced, the signal detecting circuit can bear higher fluctuation, and the capability of the signal detecting circuit for bearing fluctuation is improved. Meanwhile, the second comparing unit 112 outputs a second comparison signal with logic 1, one of the two input ends of the nand logic device is a signal with logic 1, the other is a signal with logic 0, and the nand logic device outputs an abnormal detection signal with logic 1, so that detection of the signal to be detected is realized.
The second potential provided by the second potential terminal VI2 may be a high level. The second potential terminal VI2 may be a power source terminal, for example. When the signal to be detected has a jump and the transient jump voltage is smaller than the second reference signal, the second comparing unit 112 outputs a second comparing signal with logic 0, and the second adjusting unit 122 pulls up the signal to be detected according to the falling edge of the second comparing signal, so that the fluctuation amplitude of the signal to be detected is reduced, the signal detecting circuit can bear higher fluctuation, and the capability of the signal detecting circuit for bearing fluctuation is improved. Meanwhile, the first comparing unit 111 outputs a first comparison signal with logic 1, one of the two input ends of the nand logic device is a signal with logic 1, the other is a signal with logic 0, and the nand logic device outputs an abnormal detection signal with logic 1, so that detection of the signal to be detected is realized.
According to the technical scheme, the control end of the first adjusting unit is connected with the output end of the first comparing unit, the control end of the second adjusting unit is connected with the output end of the second comparing unit, the output end of the first adjusting unit is connected with the negative input end of the first comparing unit, and the output end of the second adjusting unit is connected with the positive input end of the second comparing unit. When the amplitude jump of the signal to be detected exceeds the range between the first reference signal and the second reference signal, the first comparison signal output by the first comparison unit or the second comparison signal output by the second comparison unit jumps, and the first adjusting unit reversely adjusts the signal to be detected according to the falling edge action of the first comparison signal or the falling edge action of the second comparison signal, so that the signal to be detected changes to the range between the first reference signal and the second reference signal after jumping, the fluctuation amplitude of the signal to be detected can be reduced, and the capability of the signal detection circuit for bearing fluctuation is improved.
With continued reference to fig. 2, the first comparing unit 111 includes a first comparator COMP1; the positive phase input end of the first comparator COMP1 is used as the positive input end in1+ of the first comparing unit 111, the negative phase input end of the first comparator COMP1 is used as the negative input end IN 1-of the first comparing unit 111, and the output end of the first comparator COMP1 is used as the output end OUT11 of the first comparing unit 111;
and/or the second comparing unit 112 includes a second comparator COMP2; the positive input terminal of the second comparator COMP2 serves as the positive input terminal in2+ of the second comparing unit 112, the negative input terminal of the second comparator COMP2 serves as the negative input terminal IN 2-of the second comparing unit 112, and the output terminal of the second comparator COMP2 serves as the output terminal OUT12 of the second comparing unit 112.
Specifically, when the first comparing unit 111 includes the first comparator COMP1 and/or the second comparing unit 112 includes the second comparator COMP2, the first reference signal and the second reference signal are input amplitude fixed signals. Compared with the signal detection circuit provided by the related art, the threshold voltage of the transistor is used as the fluctuation threshold of the signal to be detected, so that the stability of the fluctuation threshold of the signal to be detected can be improved, and the detection stability of the signal detection circuit is improved.
For example, when the signal to be detected is greater than the second reference signal and less than the first reference signal, the signal at the positive phase input terminal of the first comparator COMP1 is greater than the signal at the negative phase input terminal, and the first comparator COMP1 outputs a first comparison signal with logic 1. Meanwhile, the signal at the positive phase input end of the second comparator COMP2 is greater than the signal at the negative phase input end, the second comparator COMP2 outputs a second comparison signal with logic 1, and the logic judgment module 130 outputs a normal detection signal with logic 0 according to the first comparison signal and the second comparison signal. When the signal to be detected has a jump and the transient jump voltage is greater than the first reference signal, the signal at the positive phase input end of the first comparator COMP1 is smaller than the signal at the negative phase input end, and the first comparator COMP2 outputs a first comparison signal with logic 0. The first adjusting unit 121 pulls down the signal to be detected in time according to the falling edge of the first comparison signal, so that the fluctuation amplitude of the signal to be detected is reduced, the signal detecting circuit can bear higher fluctuation, and the capability of the signal detecting circuit for bearing fluctuation is improved. Meanwhile, the signal at the positive phase input end of the second comparator COMP2 is greater than the signal at the negative phase input end, the second comparator COMP2 outputs a second comparison signal with logic 1, and the logic judgment module 130 outputs an abnormality detection signal with logic 1 according to the first comparison signal and the second comparison signal. When the signal to be detected has a jump and the transient jump voltage is smaller than the second reference signal, the signal at the positive phase input end of the second comparator COMP2 is smaller than the signal at the negative phase input end, and the second comparator COMP2 outputs a second comparison signal with logic 0. The second adjusting unit 122 pulls up the signal to be detected according to the falling edge of the second comparison signal, so that the fluctuation amplitude of the signal to be detected is reduced, the signal detecting circuit can bear higher fluctuation, and the capability of the signal detecting circuit for bearing fluctuation is improved. Meanwhile, the signal at the positive phase input end of the first comparator COMP1 is greater than the signal at the negative phase input end, the first comparator COMP1 outputs a first comparison signal with logic 1, and the logic judgment module 130 outputs an abnormality detection signal with logic 1 according to the first comparison signal and the second comparison signal.
It should be noted that fig. 2 exemplarily illustrates a solution in which the first comparing unit 111 includes a first comparator and the second comparing unit 112 includes a second comparator. In other embodiments, the technical solution that the first comparing unit 111 includes a first comparator or the second comparing unit 112 includes a second comparator may be further included, which is not described herein.
With continued reference to fig. 2, the first regulating unit 121 comprises a first controllable current source IK1; the control end of the first controllable current source IK1 is used as the control end CTRL1 of the first adjusting unit 121, the input end of the first controllable current source IK1 is used as the input end Vin21 of the first adjusting unit 121, and the output end of the first controllable current source IK1 is used as the output end OUT21 of the first adjusting unit 121;
and/or the second regulating unit 122 comprises a second controllable current source IK2; the control terminal of the second controllable current source IK2 is used as the control terminal CTRL2 of the second adjusting unit 122, the input terminal of the second controllable current source IK2 is used as the input terminal Vin22 of the second adjusting unit 122, and the output terminal of the second controllable current source IK2 is used as the output terminal OUT22 of the second adjusting unit 122.
Specifically, when the signal to be detected has a jump and the transient jump voltage is greater than the first reference signal, the first comparison signal output by the first comparison unit 111 jumps from a high level to a low level, and at this time, the low pulse ac coupling controls the first controllable current source IK1 to pull down the signal to be detected, so as to reduce the fluctuation amplitude of the signal to be detected, so that the signal detection circuit can bear higher fluctuation, and the capability of the signal detection circuit to bear fluctuation is improved. Similarly, when the signal to be detected has a jump and the transient jump voltage is smaller than the second reference signal, the second comparison signal output by the second comparison unit 112 jumps from a high level to a low level, and at this time, the low pulse ac coupling controls the second controllable current source IK2 to pull up the signal to be detected, so as to reduce the fluctuation amplitude of the signal to be detected, so that the signal detection circuit can bear higher fluctuation, and the capability of the signal detection circuit for bearing fluctuation is improved.
Fig. 3 is a schematic diagram of another signal detection circuit according to an embodiment of the present invention. As shown in fig. 3, the signal detection circuit further includes a filtering module 140; the filtering module 140 is connected between the comparing module 110 and the logic judging module 130, and the filtering module 140 is used for filtering the comparison signal output by the comparing module 110.
Specifically, when the signal to be detected has a jump and the transient jump voltage exceeds the fluctuation threshold set by the first reference signal and the second reference signal in a short time, the comparison module 110 may output a short-time pulse signal, the filtering module 140 may filter the pulse signal, and filter the pulse signal, so that when the comparison signal output by the comparison module 110 is transmitted to the logic judgment module 130 through the filtering module 140, the logic judgment module 130 outputs a normal detection signal according to the comparison signal, thereby further improving the capability of the signal detection circuit for bearing the fluctuation and improving the working stability of the signal detection circuit. The short duration that the transient jump voltage of the signal to be detected exceeds the fluctuation threshold may be determined according to the operating frequency of the filtering module 140.
With continued reference to fig. 3, the filtering module 140 includes a first filtering unit 141 and a second filtering unit 142;
the first filtering unit 141 is connected between the first comparing unit 111 and the first input terminal Vin31 of the logic determination module 130, and the first filtering unit 141 is configured to filter the first comparing signal output by the first comparing unit 111; the second filtering unit 142 is connected between the second comparing unit 112 and the second input terminal Vin32 of the logic determination module 130, and the second filtering unit 142 is configured to filter the second comparison signal output by the second comparing unit 112.
Specifically, as shown in fig. 3, when the signal to be detected has a transition and the transient transition voltage is greater than the first reference signal in a short time, the first comparing unit 111 outputs a short time low pulse signal, the first filtering unit 141 filters the short time low pulse signal to filter the pulse signal, so that the first comparing signal input by the first input Vin31 of the logic judging module 130 is still a signal with logic 1, and the second comparing unit 112 outputs a second comparing signal with logic 1, and the logic judging module 130 outputs a normal detecting signal with logic 0 according to the first comparing signal and the second comparing signal. Therefore, the capability of carrying fluctuation of the signal detection circuit can be further improved, and the working stability of the signal detection circuit is improved. When the signal to be detected has a jump and the transient jump voltage is greater than the duration of the first reference signal, the first filtering unit 141 cannot filter the pulse signal, so that the first comparison signal input by the first input end Vin31 of the logic judging module 130 is a signal with logic 0, and the second comparing unit 112 outputs a second comparison signal with logic 1, and the logic judging module 130 outputs an abnormal detection signal with logic 1 according to the first comparison signal and the second comparison signal.
When the signal to be detected has a jump and the transient jump voltage is less than the second reference signal in a short time, the second comparing unit 112 outputs a short time low pulse signal, the second filtering unit 142 filters the short time low pulse signal to filter the pulse signal, so that the second comparing signal input by the second input terminal Vin32 of the logic judging module 130 is still a signal with logic 1, meanwhile, the first comparing unit 111 outputs a second comparing signal with logic 1, and the logic judging module 130 outputs a normal detecting signal with logic 0 according to the first comparing signal and the second comparing signal. Therefore, the capability of carrying fluctuation of the signal detection circuit can be further improved, and the working stability of the signal detection circuit is improved. When the signal to be detected has a jump and the transient jump voltage is smaller than the duration of the second reference signal, the second filtering unit 142 cannot filter the pulse signal, so that the second comparison signal input by the second input end Vin32 of the logic judging module 130 is a signal with logic 0, and meanwhile, the first comparing unit 111 outputs a first comparison signal with logic 1, and the logic judging module 130 outputs an abnormal detection signal with logic 1 according to the first comparison signal and the second comparison signal.
The first filtering unit 141 includes a first resistor R1 and a first capacitor C1; a first end of the first resistor R1 is connected to the output terminal OUT11 of the first comparing unit 111, a second end of the first resistor R1 is connected to the first pole of the first capacitor C1 and the first input terminal Vin31 of the logic determination module 130, and a second pole of the first capacitor C1 is connected to the ground terminal GND;
and/or, the second filtering unit 142 includes a second resistor R2 and a second capacitor C2; the first end of the second resistor R2 is connected to the output terminal OUT12 of the second comparing unit 112, the second end of the second resistor R2 is connected to the first pole of the second capacitor C2 and the second input terminal Vin32 of the logic determination module 130, and the second pole of the second capacitor C2 is connected to the ground terminal GND.
Specifically, the first filter unit 141 and the second filter unit 142 are resistance-capacitance low-pass filter units exemplarily long in fig. 3. The short-time low pulse signals of the first comparison unit 111 and the second comparison unit 112 are respectively filtered by the resistance-capacitance low-pass filtering unit, so that the capability of bearing fluctuation of the signal detection circuit can be improved, and the working stability of the signal detection circuit is improved. The working frequencies corresponding to the first filtering unit 141 and the second filtering unit 142 may be the same, so that the duration corresponding to the pulse signals that can be filtered when the transient jump voltage of the signal to be detected exceeds the fluctuation threshold in different directions may be the same.
The embodiment of the invention also provides an integrated circuit, which comprises the signal detection circuit provided by any embodiment of the invention. Because the integrated circuit includes the signal detection circuit provided by any embodiment of the present invention, the signal detection circuit provided by any embodiment of the present invention has the same beneficial effects, and will not be described herein.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (7)
1. The signal detection circuit is characterized by comprising a comparison module, an adjusting module and a logic judging module;
the input end of the comparison module is used for inputting a signal to be detected, the first reference signal input end of the comparison module is used for inputting a first reference signal, the second reference signal input end of the comparison module is used for inputting a second reference signal, and the comparison module is used for comparing the signal to be detected with the first reference signal and the second reference signal; the control end of the adjusting module is connected with the output end of the comparing module, the output end of the adjusting module is connected with the input end of the comparing module, the input end of the adjusting module is connected with the fixed potential end, and the adjusting module is used for reversely adjusting the signal to be detected when the jump of the signal to be detected exceeds the range of the first reference signal and the second reference signal; the input end of the logic judgment module is connected with the output end of the comparison module, the output end of the logic judgment module is used as the output end of the signal detection circuit, and the logic judgment module is used for outputting an abnormal detection signal when the signal to be detected exceeds the range of the first reference signal and the second reference signal;
the comparison module comprises a first comparison unit and a second comparison unit, and the adjustment module comprises a first adjustment unit and a second adjustment unit;
the negative input end of the first comparison unit and the positive input end of the second comparison unit are used as input ends of the comparison module, the positive input end of the first comparison unit is used as a first reference signal input end of the comparison module, the negative input end of the second comparison unit is used as a second reference signal input end of the comparison module, the output end of the first comparison unit is connected with the control end of the first adjustment unit and the first input end of the logic judgment module, the output end of the first adjustment unit is connected with the negative input end of the first comparison unit, the input end of the first adjustment unit is connected with a first potential input end, the first adjustment unit is used for comparing the size of the signal to be detected and the first reference signal, and the first adjustment unit is used for pulling down the signal to be detected when the signal to be detected jumps more than the first reference signal; the output end of the second comparison unit is connected with the control end of the second adjustment unit and the second input end of the logic judgment module, the output end of the second adjustment unit is connected with the positive input end of the second comparison unit, the input end of the second adjustment unit is connected with the second potential input end, the second comparison unit is used for comparing the size of the signal to be detected with the size of the second reference signal, and the second adjustment unit is used for pulling up the signal to be detected when the jump of the signal to be detected is smaller than that of the second reference signal; the logic judgment module is used for outputting the abnormal detection signal when the signal to be detected is larger than the first reference signal and/or when the signal to be detected is smaller than the second reference signal; wherein the amplitude of the first reference signal is greater than the amplitude of the second reference signal;
the logic judgment module comprises a NAND logic device;
the first input end of the NAND logic device is used as the first input end of the logic judging module, the second input end of the NAND logic device is used as the second input end of the logic judging module, and the output end of the NAND logic device is used as the output end of the logic judging module.
2. The signal detection circuit of claim 1, wherein the first comparison unit comprises a first comparator; the positive phase input end of the first comparator is used as the positive input end of the first comparison unit, the negative phase input end of the first comparator is used as the negative input end of the first comparison unit, and the output end of the first comparator is used as the output end of the first comparison unit;
and/or the second comparing unit comprises a second comparator; the positive phase input end of the second comparator is used as the positive input end of the second comparison unit, the negative phase input end of the second comparator is used as the negative input end of the second comparison unit, and the output end of the second comparator is used as the output end of the second comparison unit.
3. The signal detection circuit of claim 1, wherein the first regulation unit comprises a first controllable current source; the control end of the first controllable current source is used as the control end of the first adjusting unit, the input end of the first controllable current source is used as the input end of the first adjusting unit, and the output end of the first controllable current source is used as the output end of the first adjusting unit;
and/or the second regulating unit comprises a second controllable current source; the control end of the second controllable current source is used as the control end of the second adjusting unit, the input end of the second controllable current source is used as the input end of the second adjusting unit, and the output end of the second controllable current source is used as the output end of the second adjusting unit.
4. A signal detection circuit according to any one of claims 1 to 3, further comprising a filtering module;
the filtering module is connected between the comparing module and the logic judging module and is used for filtering the comparison signal output by the comparing module.
5. The signal detection circuit of claim 4, wherein the filtering module comprises a first filtering unit and a second filtering unit;
the first filtering unit is connected between the first comparing unit and the first input end of the logic judging module, and is used for filtering the first comparing signal output by the first comparing unit; the second filtering unit is connected between the second comparing unit and the second input end of the logic judging module, and is used for filtering a second comparison signal output by the second comparing unit.
6. The signal detection circuit of claim 5, wherein the first filter unit comprises a first resistor and a first capacitor; the first end of the first resistor is connected with the output end of the first comparison unit, the second end of the first resistor is connected with the first pole of the first capacitor and the first input end of the logic judgment module, and the second pole of the first capacitor is connected with the grounding end;
and/or the second filtering unit comprises a second resistor and a second capacitor; the first end of the second resistor is connected with the output end of the second comparison unit, the second end of the second resistor is connected with the first pole of the second capacitor and the second input end of the logic judgment module, and the second pole of the second capacitor is connected with the grounding end.
7. An integrated circuit comprising the signal detection circuit of any one of claims 1-6.
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| CN102014017A (en) * | 2010-09-30 | 2011-04-13 | 华为技术有限公司 | Signal detection circuit, method and system |
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| JP3889402B2 (en) * | 2004-01-22 | 2007-03-07 | ローム株式会社 | Overcurrent detection circuit and regulator provided with the same |
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