CN210041830U - A fast negative voltage switching circuit - Google Patents

Abstract

The utility model discloses a fast negative voltage switching circuit. By setting a reference voltage input terminal that outputs a reference voltage with a predetermined level value _Vref , a digital controller that outputs a numerical control signal with a preset level value _Vin , and The above-mentioned reference voltage input terminal and the digital controller are connected to an operational amplifier, so that the operational amplifier can be used to inversely amplify the numerically controlled signal based on the reference voltage, generate different negative voltage signals, and simultaneously output the different negative voltage signals to the radio frequency The gate voltage receiving end of the chip is used to realize the on-off control of the receiving channel and/or the transmitting channel. By changing the level value of the reference voltage, negative voltages with different voltage values can be output to realize the control of different radio frequency chips. It can be seen that the technical solutions of the embodiments of the present application have the technical effect of expanding the scope of application of the negative voltage switching circuit. At the same time, because the operational amplifier has fast response and low cost, it also has the technical effects of fast switching speed, high operation efficiency, and high degree of simplification of operation.

Description

A fast negative voltage switching circuit

technical field

The utility model relates to the technical field of phased array antenna radio frequency chip control, in particular to a fast negative voltage switching circuit.

Background technique

At present, when the active phased array antenna is working, it is necessary to quickly switch the transceiver state of the radio frequency chip in nanoseconds. The existing active phased array antenna transmit and receive switching control schemes mainly include the following two methods: the first one It adopts the method of leakage voltage switching. This method controls the opening or closing of the chip receiving/transmitting channel by controlling the voltage on the drain of the chip. This method has the advantages of low control precision, high noise, and high noise. It is easy to cause chip failure, poor reliability and other shortcomings; the second is to use the gate voltage switching method, which is to control the pinch-off of the corresponding channel through the drain voltage of the RF chip that is often supplied, and then control the voltage on the gate. And then realize the opening or closing of the receiving/transmitting channel. Compared with the drain voltage switching method, the gate voltage switching method has the advantages of high control accuracy, low noise and high reliability. However, due to the process characteristics of the RF chip, the control voltage on the gate must be a negative voltage, and the control signal output by the digital controller is generally a digital signal with a positive voltage, which cannot be directly matched. Therefore, it is necessary to convert the digital signal into a corresponding digital signal. the negative voltage control signal. Further, since the switching speed of the phased array antenna system is very high, the signal channel mode switching speed of the RF chip is also very high, and the existing grid voltage switching speed cannot reach the high-speed transmission and reception of the phased array antenna system. Mode switching requirements.

It can be seen that there is a technical problem in the prior art that the switching speed of the signal channel switching of the radio frequency chip cannot meet the high-speed requirement of the phased array antenna system.

Utility model content

The present application provides a fast negative voltage switching circuit, which is used to solve the technical problem in the prior art that the switching speed of the signal channel disconnection control of the radio frequency chip cannot meet the high-speed requirement of the phased array antenna system.

The present application provides a fast negative voltage switching circuit, including:

a reference voltage input terminal for outputting a reference voltage with a predetermined level value _Vref ;

a digital controller for outputting a numerically controlled signal with a preset level value V _in ;

an operational amplifier, connected to the reference voltage input terminal and the digital controller, respectively, for performing reverse amplification processing on the numerically controlled signal based on the reference voltage to generate a negative voltage signal corresponding to V _ref and V _in ;

A radio frequency chip, comprising a signal receiving channel or a signal transmitting channel, the gate voltage receiving end of the signal receiving channel or the signal transmitting channel is connected to the operational amplifier, and is used for the negative voltage signal received by the gate voltage receiving end The level value Vout controls the opening and closing of the signal receiving channel or the signal transmitting channel.

Optionally, the switching circuit further includes:

a first resistor, which is arranged on the connection path between the digital controller and the operational amplifier, and the first resistor has a preset resistance value R ₁ ;

a second resistor, disposed on the connection path between the first resistor and the radio frequency chip and in parallel with the operational amplifier, the second resistor has a preset resistance value R ₂ ;

The operational amplifier is used to inversely amplify the digitally controlled signal based on V _ref , V _in , R ₁ and R ₂ to generate a corresponding negative voltage signal V _out .

Optionally, the operational amplifier is used to inversely amplify the numerically controlled signal based on a first calculation formula to generate a corresponding negative voltage signal V _out , where the first calculation formula is:

V _out =(1+R ₂ /R ₁ )*V _ref −(R ₂ /R ₁ )V _in .

Optionally, the first resistor and/or the second resistor are adjustable resistors.

Optionally, when the radio frequency chip includes a signal transmission channel, the transmission gate voltage receiving end of the signal transmission channel is used to control the signal transmission channel to be in a state after receiving a negative voltage signal with a first level value. open state, otherwise control the transmit channel to be in the closed state; and/or,

When the radio frequency chip includes a signal receiving channel, the receiving gate voltage receiving end of the signal receiving channel is used to control the signal receiving channel to be in an open state after receiving a negative voltage signal with a second level value, otherwise controlling the signal receiving channel to be in a closed state;

Wherein, the first level value and the second level value are different.

Optionally, the digital controller includes:

CPU, and/or MCU, and/or FPGA, and/or DSP.

One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

The technical solution in the application embodiment is to set a reference voltage input terminal that outputs a reference voltage with a predetermined level value V _ref , a digital controller that outputs a numerical control signal with a predetermined level value V _in , and connect the above reference voltage input terminal to the reference voltage. The digital controller is connected to the operational amplifier, so that the operational amplifier can be used to inversely amplify the digitally controlled signal based on the reference voltage, generate different negative voltage signals, and output the different negative voltage signals to the gate voltage receiving end of the radio frequency chip In order to realize the opening and closing control of the receiving channel and/or the transmitting channel. By changing the level value of the reference voltage, negative voltages with different voltage values can be output to realize the control of different radio frequency chips. It can be seen that the technical solutions of the embodiments of the present application have the technical effect of expanding the scope of application of the negative voltage switching circuit. At the same time, since the operational amplifier has the advantages of fast response and low cost, the technical solutions in the embodiments of the present application can also have the technical effects of fast switching speed, high operation efficiency, and high degree of simplification of operation.

Description of drawings

1 is a structural diagram of a fast negative voltage switching circuit provided by an embodiment of the present invention;

FIG. 2 is a circuit diagram of a fast negative voltage switching circuit provided by an embodiment of the present invention.

Detailed ways

The present application provides a fast negative voltage switching circuit, which is used to solve the technical problem in the prior art that the switching speed of the signal channel disconnection control of the radio frequency chip cannot meet the high-speed requirement of the phased array antenna system.

The technical solutions in the embodiments of the present application are to solve the above-mentioned technical problems, and the general idea is as follows:

The technical solution in the application embodiment is to set a reference voltage input terminal that outputs a reference voltage with a predetermined level value V _ref , a digital controller that outputs a numerical control signal with a predetermined level value V _in , and connect the above reference voltage input terminal to the reference voltage. The digital controller is connected to the operational amplifier, so that the operational amplifier can be used to inversely amplify the digitally controlled signal based on the reference voltage, generate different negative voltage signals, and output the different negative voltage signals to the gate voltage receiving end of the radio frequency chip In order to realize the opening and closing control of the receiving channel and/or the transmitting channel. By changing the level value of the reference voltage, negative voltages with different voltage values can be output to realize the control of different radio frequency chips. It can be seen that the technical solutions of the embodiments of the present application have the technical effect of expanding the scope of application of the negative voltage switching circuit. At the same time, since the operational amplifier has the advantages of fast response and low cost, the technical solutions in the embodiments of the present application can also have the technical effects of fast switching speed, high operation efficiency, and high degree of simplification of operation.

The technical solutions of the present application will be described in detail below with reference to the accompanying drawings and specific embodiments. If there is no conflict, the embodiments of the present application and the technical features in the embodiments may be combined with each other.

The term "and/or" in this article is only an association relationship to describe the associated objects, indicating that there can be three kinds of relationships, for example, A and/or B, it can mean that A exists alone, A and B exist at the same time, and A and B exist independently B these three cases. In addition, the character "/" in this text generally indicates that the related objects are an "or" relationship.

Example 1

Referring to FIG. 1 and FIG. 2 , Embodiment 1 of the present application provides a fast negative voltage switching circuit, including:

a reference voltage input terminal 101 for outputting a reference voltage with a predetermined level value _Vref ;

a digital controller 102 for outputting a numerically controlled signal with a preset level value V _in ;

The operational amplifier 103 is connected to the reference voltage input terminal and the digital controller respectively, and is used for inversely amplifying the digital control signal based on the reference voltage to generate a negative voltage signal corresponding to V _ref and V _in ;

The radio frequency chip 104 includes a signal receiving channel or a signal transmitting channel, the gate voltage receiving end of the signal receiving channel or the signal transmitting channel is connected to the operational amplifier, and is used for the negative voltage received by the gate voltage receiving end The level value V _out of the signal controls the opening and closing of the signal receiving channel or the signal transmitting channel.

In the actual operation process, the digital control signal can be input by the user or the system preset through the digital controller, and the digital control signal can be switched in two states of high level V _{H_DIG} and low level V _{L_DIG} , for example , the high level V _{H_DIG} may be 1.8V, 3.3V, etc., and the low level V _{L_DIG} may be 0V. The numerical control signal can be converted into a corresponding negative voltage signal after being inverted and amplified by an operational amplifier, that is, different numerical control signals can be correspondingly converted into different negative voltage signals. The gate voltage receiving end of the RF chip can correspondingly control the opening or closing of the signal receiving/transmitting channel according to the received different negative voltage signals, thereby realizing the switching control of the transmitting and receiving modes of the transmitting channel and the receiving channel of the RF chip respectively. . For radio frequency chips that need to be controlled by different negative voltage values, based on the principle of reverse amplification of operational amplifiers, by changing the level value V _ref of the reference voltage, negative voltages with different voltage values can be output to achieve different It can be seen that the negative voltage switching circuit in the technical solution of the embodiment of the present application can be applied to various radio frequency chips, and has the technical effect of expanding the application range of the negative voltage switching circuit. At the same time, since the operational amplifier has the advantages of fast response and low cost, the technical solutions in the embodiments of the present application can also have the technical effects of fast switching speed, high operation efficiency, and high degree of simplification of operation.

Meanwhile, the switching circuit in the embodiment of the present application further includes:

a first resistor, arranged on the connection path between the digital controller and the operational amplifier, the first resistor has a preset resistance value R ₁ ;

a second resistor, disposed on the connection path between the first resistor and the radio frequency chip and in parallel with the operational amplifier, the second resistor has a preset resistance value R ₂ ;

The operational amplifier is used to inversely amplify the digitally controlled signal based on V _ref , V _in , R ₁ and R ₂ to generate a corresponding negative voltage signal V _out .

Through the above settings, in the process of controlling the output of different negative voltage signals, by further changing the values of R ₁ and R ₂ and adjusting the level value V _ref of the reference voltage, more and more outputs can be output. Negative voltage signals with different voltage values are used to control more types of radio frequency chips.

Still further, the operational amplifier is used to perform inverse amplification processing on the numerically controlled signal based on a first calculation formula to generate a corresponding negative voltage signal V _out , wherein the first calculation formula is:

V _out =(1+R ₂ /R ₁ )*V _ref −(R ₂ /R ₁ )V _in .

In practical applications, it is usually necessary to arrange multiple radio frequency chips in a communication system. At the same time, the signal level of the signal transmission channel and signal reception channel of these radio frequency chips may also be very close to the level of the negative voltage signal that controls the opening and closing of the digital controller. A slightly lower precision of the output negative voltage signal will cause different signal transmitting channels and signal receiving channels to have opening and closing obstacles or uncoordinated consequences. Therefore, the technical solutions in the embodiments of the present application can easily generate a variety of negative voltages within a small range of level values based on adjusting the values of V _ref , V _in , R ₁ and R ₂ by using the above formulas Signals are used to control these huge number of RF chip channels, so that while improving the control accuracy of the RF chip, it can also generate a larger number of negative voltage signal level values to achieve a wide range of high-efficiency control. Therefore, the technical solutions in the embodiments of the present application also have the technical effects of further improving the applicability and scope of application, and improving the control precision of the radio frequency chip.

In order to further realize the automation level of the system, the first resistor and/or the second resistor are adjustable resistors, so that the system can automatically control the first resistor and/or the second resistor to adjust to the required resistance value R ₁ and resistance R ₂ .

Still further, when the radio frequency chip includes a signal transmission channel, the transmission gate voltage receiving end of the signal transmission channel is used to control the signal transmission channel to be in a state after receiving a negative voltage signal with a first level value. open state, otherwise control the transmit channel to be in the closed state; and/or,

When the radio frequency chip includes a signal receiving channel, the receiving gate voltage receiving end of the signal receiving channel is used to control the signal receiving channel to be in an open state after receiving a negative voltage signal with a second level value, otherwise controlling the signal receiving channel to be in a closed state;

Wherein, the first level value and the second level value are different.

That is to say, as shown in FIG. 2 , in the embodiment of the present application, each signal transmission channel is independently controlled by corresponding to a fast negative voltage switching circuit in the embodiment of the present application. At the same time, in these fast negative voltage switching circuits The digital controllers can be combined into one digital controller, and in actual operation, the digital controller can send corresponding numerical control signals to these negative voltage switching circuits respectively. For example, when the radio frequency chip is in the signal transmission state, the digital controller can output the corresponding first control signal (such as VH_DIG) to the signal transmission channel, and the circuit where the first operational amplifier corresponding to the signal transmission channel is located works together to control the first control signal. The signal is reverse amplified to generate the corresponding first negative voltage signal, so that the signal transmitting channel is turned on; at the same time, the digital controller also sends the corresponding second control signal (such as VL_DIG) to the signal receiving channel, which is connected to the signal receiving channel correspondingly. The circuits in which the second operational amplifier is located work together to perform inverse amplification processing on the second control signal to generate a corresponding second negative voltage signal, so that the signal receiving channel is closed. When working in the receiving state, the control logic is opposite to the transmitting state. Thus, the switching control of the signal transceiving mode of the radio frequency chip is completed.

It can be seen from the above that the technical solutions in the embodiments of the present application can greatly reduce the application cost of the negative voltage switching circuit in the embodiments of the present application, and can also improve the isolation of each signal transmission path in the radio frequency chip, thereby reducing the control of the radio frequency chip. The technical effect of the error rate.

More specifically, in the embodiments of the present application, the digital controller may specifically be the following device, or a combination of the following devices: CPU, and/or MCU, and/or FPGA, and/or DSP. Thereby, the technical effects of reducing the application cost and realizing the flexibility of the equipment can be achieved.

It can be seen from this that the technical solutions in the embodiments of the present application provide a digital controller that outputs a reference voltage input terminal with a predetermined level value V _ref reference voltage, and outputs a numerical control signal with a predetermined level value V _in , and converts the above-mentioned The reference voltage input terminal and the digital controller are connected to the operational amplifier, so that the operational amplifier can be used to inversely amplify the numerical control signal based on the reference voltage, generate different negative voltage signals, and output the different negative voltage signals to the radio frequency chip The gate voltage receiving end can realize the opening and closing control of the receiving channel and/or the transmitting channel. By changing the level value of the reference voltage, negative voltages with different voltage values can be output to realize the control of different radio frequency chips. It can be seen that the technical solutions of the embodiments of the present application have the technical effect of expanding the scope of application of the negative voltage switching circuit. At the same time, since the operational amplifier has the advantages of fast response and low cost, the technical solutions in the embodiments of the present application can also have the technical effects of fast switching speed, high operation efficiency, and high degree of simplification of operation.

While the preferred embodiments of the present application have been described, additional changes and modifications to these embodiments may occur to those skilled in the art once the basic inventive concepts are known. Therefore, the appended claims are intended to be construed to include the preferred embodiment and all changes and modifications that fall within the scope of this application.

Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Further, each method step in the technical solution of the present application can be reversed, and the sequence of the method can be changed to still fall within the scope of the utility model covered by the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims (6)

1. A fast negative voltage switching circuit, comprising:

a reference voltage input terminal for outputting a reference voltage having a predetermined level value V_refA reference voltage of (d);

a digital controller for outputting a signal having a predetermined level value V_inThe numerical control signal of (2);

an operational amplifier respectively connected with the reference voltage input end and the digital controller and used for carrying out reverse amplification processing on the numerical control signal based on the reference voltage to generate the control signal V_refAnd V_inA corresponding negative voltage signal;

the radio frequency chip comprises a signal receiving channel or a signal transmitting channel, wherein a grid voltage receiving end of the signal receiving channel or the signal transmitting channel is connected with the operational amplifier and used for receiving a level value V of the negative voltage signal based on the grid voltage receiving end_outAnd controlling the opening and closing of the signal receiving channel or the signal transmitting channel.

2. The switching circuit of claim 1, wherein the switching circuit further comprises:

a first resistor disposed on a connection path between the digital controller and the operational amplifier, the first resistor having a predetermined resistance value R₁；

A second resistor disposed on a connection path between the first resistor and the RF chip and connected in parallel with the operational amplifier, the second resistor having a predetermined resistance R₂；

The operational amplifier is based on V_ref、V_in、R₁And R₂Carrying out reverse amplification processing on the numerical control signal to generate a corresponding negative voltage signal V_out。

3. The switching circuit of claim 1, wherein the operational amplifier is configured to perform inverse amplification processing on the digital control signal based on a first calculation formula to generate a corresponding negative voltage signal V_outWherein the first calculation formula is:

V_out＝(1+R₂/R₁)*V_ref-(R₂/R₁)V_in。

4. the switching circuit of claim 2, wherein the first resistance and/or the second resistance is an adjustable resistance.

5. The switching circuit of claim 1, wherein when the rf chip includes a signal transmitting channel, a transmitting gate voltage receiving end of the signal transmitting channel is configured to control the signal transmitting channel to be in an on state after receiving a negative voltage signal having a first level value, and otherwise to control the transmitting channel to be in an off state; and/or the presence of a gas in the gas,

when the radio frequency chip comprises a signal receiving channel, a receiving grid voltage receiving end of the signal receiving channel is used for controlling the signal receiving channel to be in an open state after receiving a negative voltage signal with a second level value, and otherwise, controlling the signal receiving channel to be in a closed state;

wherein the first level value and the second level value are different.

6. The switching circuit of claim 1, wherein the digital controller comprises:

a CPU, and/or an MCU, and/or an FPGA, and/or a DSP.

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