CN207442807U - A kind of signal limiter circuit of precision - Google Patents
A kind of signal limiter circuit of precision Download PDFInfo
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- CN207442807U CN207442807U CN201721670161.7U CN201721670161U CN207442807U CN 207442807 U CN207442807 U CN 207442807U CN 201721670161 U CN201721670161 U CN 201721670161U CN 207442807 U CN207442807 U CN 207442807U
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Abstract
The utility model provides a kind of precision signal limiter circuit, and including amplitude limiter circuit, signal processing circuit and reference circuits, the amplitude limiter circuit is connected respectively with signal processing circuit and reference circuits；The amplitude limiter circuit includes comparator U2A, and the in-phase input end of comparator U2A connects a resistance RT；The rear class output signal v of the upper resistance RT0, branch where upper resistance RT set there are three node, is respectively first node, section point and the 3rd node, first node series capacitance, the rear class ground connection of capacitance, section point series resistance R4, the 3rd node connecting resistance R9.The utility model solves the problems, such as signal precision amplitude limit, signal limiter precision is increased to several millivolts (＜ 5mV) from ± 5% (slicer errors to 5V signals are ± 0.25V), signal accuracy and the influence for avoiding signal limiter excessively high to system reliability can be effectively improved, using in the telemetered signal of Mr. Yu's type product.
Description
Technical field
The utility model is related to a kind of signal limiter circuits of precision, belong to analogue signal processing field.
Background technology
In signal processing circuit, it is sometimes desirable to the amplitude of signal be limited, not high to amplitude limit required precision
In the case of, the clamper principle of generally use zener diode carries out signal limiter degree, as shown in Figure 1, but zener diode clamp
Position amplitude limiter circuit there are it is following the problem of：
1) voltage-stabiliser tube for meeting pressure limiting amplitude requirement may not necessarily be chosen, can only select voltage stabilizing value at this time similar in voltage-stabiliser tube, lead
Cause amplitude limit value inaccurate；
2) the voltage stabilizing value of zener diode is a scope (being usually ± 5%) rather than a point, causes amplitude limit value not
Accurately；
3) for zener diode there are leakage current, which forms a shunting, when causing the signal to be not up to amplitude limit value pair
The precision of signal generates influence.
In the telemetry system in the fields such as Aeronautics and Astronautics, it is desirable that accurate amplitude limit is carried out to telemetered signal so that data to be protected to adopt
Collecting system improves the reliability of system, and amplitude limiter circuit shown in FIG. 1 is difficult to meet the requirements at this time.
Utility model content
In order to solve the above technical problems, the utility model provides a kind of signal limiter circuit of precision, the accurate letter
Number amplitude limiter circuit is detected signal amplitude using comparator, with the output control signal clamp circuit of comparator whether work
Make, realized using the low Misalignment Characteristics of comparator and accurate amplitude limit is carried out to signal.
The utility model is achieved by the following technical programs.
The signal limiter circuit of a kind of precision provided by the utility model, including amplitude limiter circuit, signal processing circuit and electricity
Reference circuit is pressed, the amplitude limiter circuit is connected respectively with signal processing circuit and reference circuits；
The amplitude limiter circuit includes comparator U2A, and the in-phase input end of comparator U2A connects a resistance RT；It is described upper
The rear class output signal v of resistance RT0, branch where upper resistance RT is set there are three node, is respectively first node, section point
With the 3rd node, first node series capacitance, the rear class ground connection of capacitance, section point series resistance R4, the 3rd node connecting resistance
The rear class of R9, resistance R9 connect the cathode of diode, and the anode of diode connects the output terminal of comparator U2A；The comparator U2A's
Anti-phase input termination pull down resistor R8.
The diode is zener diode.
The signal processing circuit includes operational amplifier U1A, the anti-phase input termination operation amplifier of operational amplifier U1A
The output terminal of device U1A, it is in parallel there are two pull down resistor in inverting input, it is respectively pull down resistor R2 and pull down resistor R3.
The in-phase input end of the operational amplifier U1A connects pull-up resistor R1.
Branch road where the pull down resistor R3 is equipped with node, the prime input letter of node connecting resistance R4, pull-up resistor R1
Number vi。
The reference circuits include voltage reference, and voltage reference series resistance R5 is followed by pull down resistor R8, in resistance
Branch road where R5, equipped with node, node meets pull down resistor R6.
The beneficial effects of the utility model are：Solve the problems, such as signal precision amplitude limit, by signal limiter precision from ±
5% (being ± 0.25V to the slicer errors of 5V signals) is increased to several millivolts (＜ 5mV), can effectively improve signal accuracy and
The influence for avoiding signal limiter excessively high to system reliability, using in the telemetered signal of Mr. Yu's type product.
Description of the drawings
Fig. 1 is the custom circuit figure in the utility model background technology；
Fig. 2 is the circuit diagram of the utility model.
Specific embodiment
Be described further below the technical solution of the utility model, but claimed scope be not limited to it is described.
As shown in Fig. 2, a kind of signal limiter circuit of precision, including amplitude limiter circuit, signal processing circuit and Voltage Reference
Circuit, the amplitude limiter circuit are connected respectively with signal processing circuit and reference circuits；
The amplitude limiter circuit includes comparator U2A, and the in-phase input end of comparator U2A connects a resistance RT；It is described upper
The rear class output signal v of resistance RT0, branch where upper resistance RT is set there are three node, is respectively first node, section point
With the 3rd node, first node series capacitance, the rear class ground connection of capacitance, section point series resistance R4, the 3rd node connecting resistance
The rear class of R9, resistance R9 connect the cathode of diode, and the anode of diode connects the output terminal of comparator U2A；The comparator U2A's
Anti-phase input termination pull down resistor R8.
The signal processing circuit includes operational amplifier U1A, the anti-phase input termination operation amplifier of operational amplifier U1A
The output terminal of device U1A, it is in parallel there are two pull down resistor in inverting input, it is respectively pull down resistor R2 and pull down resistor R3, transports
The in-phase input end for calculating amplifier U1A connects pull-up resistor R1.
Branch road where the pull down resistor R3 is equipped with node, the prime input letter of node connecting resistance R4, pull-up resistor R1
Number vi。
The reference circuits include voltage reference, and voltage reference series resistance R5 is followed by pull down resistor R8, in resistance
Branch road where R5, equipped with node, node meets pull down resistor R6.
The work process of the utility model is as follows：
Reference voltage vrFor the voltage value that signal needs limit, it can be obtained by voltage reference through electric resistance partial pressure, work as signal
vioLess than reference voltage vrWhen, comparator U2A is not overturn, output open circuit, and voltage-stabiliser tube diode is not turned on, and does not have shadow to signal
It rings；As signal vioHigher than reference voltage vrWhen, comparator U2A overturnings are exported to be low, zener diode conducting, signal vioOne
Portion voltage is dropped on resistance R4, makes output signal voAmplitude reduction, comparator U2A, which passes through, detects output signal voTo determine
The frequency of overturning and time so as to control the average pressure drop on resistance R4, most export signal v at lastoAmplitude be limited in reference
Voltage vrValue, the amplitude limit method is using pulse width modulation (PWM) and negative feedback control principle.
In the utility model：
1) reference voltage vrIt can be obtained by voltage reference through electric resistance partial pressure, it can so as to solve zener diode voltage
The problem of being unsatisfactory for signal voltage amplitude, wherein, zener diode is chosen voltage stabilizing value and is less than but closest to reference voltage vr's
Zener diode；
2) offset voltage of comparator U2A generally only have several millivolts, solve zener diode voltage stabilizing value exist from
The problem of dissipating property (usually hundreds of millivolts of difference), causing amplitude limit value inaccurate；
3) as signal vioLess than reference voltage vrWhen comparator U2A output open circuits, the leakage current of zener diode is logical
Road does not have an impact signal, and the leakage current for solving the problems, such as zener diode has an impact signal.
In conclusion as output signal vo≤ reference voltage vrWhen, comparator U2A output open circuits, to exporting signal voNot shadow
It rings；As output signal vo＞ reference voltages vrWhen, by output signal vo- reference voltage vrDifference automatic adjustment switch frequency
And the time, control the average pressure drop on resistance R4, final steady set output signal vo.Capacitance is to exporting signal voCarry out smothing filtering.
Claims (6)
1. a kind of signal limiter circuit of precision, it is characterised in that：Including amplitude limiter circuit, signal processing circuit and Voltage Reference electricity
Road, the amplitude limiter circuit are connected respectively with signal processing circuit and reference circuits；
The amplitude limiter circuit includes comparator U2A, and the in-phase input end of comparator U2A connects a resistance RT；The upper resistance
The rear class output signal v of RT0, branch where upper resistance RT set there are three node, is respectively first node, section point and the
Three nodes, first node series capacitance, the rear class ground connection of capacitance, section point series resistance R4, the 3rd node connecting resistance R9, electricity
The rear class of resistance R9 connects the cathode of diode, and the anode of diode connects the output terminal of comparator U2A；The reverse phase of the comparator U2A
Input termination pull down resistor R8.
2. accurate signal limiter circuit as described in claim 1, it is characterised in that：The diode is zener diode.
3. accurate signal limiter circuit as described in claim 1, it is characterised in that：The signal processing circuit includes computing
The output terminal of the anti-phase input termination operational amplifier U1A of amplifier U1A, operational amplifier U1A, are parallel in inverting input
Two pull down resistors are respectively pull down resistor R2 and pull down resistor R3.
4. accurate signal limiter circuit as claimed in claim 3, it is characterised in that：The same phase of the operational amplifier U1A
Input terminal connects pull-up resistor R1.
5. the accurate signal limiter circuit as described in claim 3 or 4, it is characterised in that：Branch where the pull down resistor R3
Road is equipped with node, the prime input signal v of node connecting resistance R4, pull-up resistor R1i。
6. accurate signal limiter circuit as described in claim 1, it is characterised in that：The reference circuits include voltage
Benchmark, voltage reference series resistance R5 are followed by pull down resistor R8, on branch road, equipped with node, node connects drop-down where resistance R5
Resistance R6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721670161.7U CN207442807U (en) | 2017-12-05 | 2017-12-05 | A kind of signal limiter circuit of precision |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721670161.7U CN207442807U (en) | 2017-12-05 | 2017-12-05 | A kind of signal limiter circuit of precision |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207442807U true CN207442807U (en) | 2018-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721670161.7U Active CN207442807U (en) | 2017-12-05 | 2017-12-05 | A kind of signal limiter circuit of precision |
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| CN (1) | CN207442807U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112260667A (en) * | 2020-11-09 | 2021-01-22 | 苏州坤元微电子有限公司 | Single-amplitude limiting circuit and double-amplitude limiting circuit |
| CN117032371A (en) * | 2023-08-28 | 2023-11-10 | 天津津航计算技术研究所 | A piecewise linear reference voltage generation circuit and reference voltage output control method |
-
2017
- 2017-12-05 CN CN201721670161.7U patent/CN207442807U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112260667A (en) * | 2020-11-09 | 2021-01-22 | 苏州坤元微电子有限公司 | Single-amplitude limiting circuit and double-amplitude limiting circuit |
| CN117032371A (en) * | 2023-08-28 | 2023-11-10 | 天津津航计算技术研究所 | A piecewise linear reference voltage generation circuit and reference voltage output control method |
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