Multi-mode variable gain amplifier
By introducing charge pumps and switching components into the variable gain amplifier, a multimodal variable gain amplifier that switches under different power supply conditions is achieved, solving the problem that traditional amplifiers cannot meet both low power consumption and high dynamic range outputs, and achieving flexible application adaptability.
Patent Information
- Application Number
- CN202421558371.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-03
- Publication Date
- 2025-04-15
- Estimated Expiration
- 2034-07-03
AI Technical Summary
Traditional variable gain amplifiers cannot switch between low power and high dynamic range outputs simultaneously, and cannot meet complex application requirements.
A multimodal variable gain amplifier is designed, using a charge pump and switching components, which converts the low-voltage DC voltage to a high-voltage DC voltage through the charge pump, and switches between low-voltage and high-voltage power supply through the switching components to achieve low power consumption and high-dynamic range output.
It realizes low power consumption output at low power voltage and high dynamic range output at high power voltage to meet complex application needs.
Smart Images
Figure CN222763863U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an electronic amplifier, in particular to a multi-mode variable gain amplifier. Background Art
[0002] A variable gain amplifier is an electronic amplifier whose gain can be adjusted during operation. Variable gain amplifiers are widely used in various situations where signal strength needs to be adjusted, including communications, audio processing, signal processing, and automatic control systems. In wireless receivers, variable gain amplifiers can adjust the strength of the received signal to adapt to different signal conditions and maintain the best signal-to-noise ratio. In audio equipment, variable gain amplifiers can be used for volume control to maintain consistent volume. In data acquisition systems, variable gain amplifiers can adjust the amplitude of the input signal to adapt it to the input range of the analog-to-digital converter.
[0003] One of the most important indicators of a variable gain amplifier is the gain range, which determines the range of signal strengths that it can adjust, and the gain range is subject to the output swing. In some applications with small gain range requirements, the variable gain amplifier needs to maintain low power consumption as much as possible. In some applications with large gain range requirements, the variable gain amplifier needs to achieve large output swing and high dynamic range. However, traditional variable gain amplifiers cannot meet these different application requirements at the same time due to unreasonable circuit structure design. Summary of the invention
[0004] The technical problem to be solved by the utility model is to provide a multi-mode variable gain amplifier which can not only achieve low power consumption output under low power supply voltage, but also achieve large output swing and high dynamic range output under high power supply voltage, thereby meeting complex application requirements.
[0005] In order to solve the above technical problems, the multi-modal variable gain amplifier of the utility model includes a first power supply for low-voltage DC power supply, a charge pump connected to the first power supply and used to convert the low-voltage DC voltage provided by the first power supply into a high-voltage DC voltage, and a variable gain amplifier for realizing variable gain output. A switching component for switching between low-voltage DC power supply and high-voltage DC power supply is arranged between the input end of the variable gain amplifier and the first power supply and between the input end of the variable gain amplifier and the charge pump.
[0006] The switching component includes a first selection switch provided between an output terminal of the charge pump and an input terminal of the variable gain amplifier and a second selection switch provided between a first power supply and the input terminal of the variable gain amplifier.
[0007] The first power supply is a low voltage DC power supply.
[0008] The charge pump is constructed by a two-stage cross-coupling structure.
[0009] The charge pump is composed of four NMOS tubes, two PMOS tubes and four boost capacitors.
[0010] The variable gain amplifier is composed of a variable resistor R1 , a single-ended output operational amplifier A connected to the output end of the variable resistor R1 , and an amplifying resistor R2 connected across the single-ended output operational amplifier A.
[0011] The resistance value of the variable resistor R1 has three options, namely the resistance values of resistor R3, resistor R4 and resistor R5. The resistor R3 is connected to switch M1, the resistor R4 is connected to switch M2, and the resistor R5 is connected to switch M3 and can achieve different resistance value selections under the action of switch M1, switch M2 and switch M3.
[0012] Compared with the prior art, the beneficial effects of the utility model are:
[0013] By setting up a multi-modal variable gain amplifier composed of a first power supply, a charge pump, a variable gain amplifier and a switching component, the charge pump can directly increase the power supply voltage. Under the action of the switching component, there are two working modes: a low power consumption mode under a low-voltage power supply and a large output swing high dynamic range mode under a high-voltage power supply, thereby meeting complex application requirements and adapting to different application environments. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is a principle block diagram of the multi-mode variable gain amplifier of the utility model;
[0015] Figure 2 It is a circuit diagram of the charge pump in the utility model;
[0016] Figure 3 It is a circuit diagram of a variable gain amplifier in the utility model;
[0017] Attached photos
[0018] 100 - a first power supply; 101 - a charge pump; 102 - a first selection switch; 103 - a second selection switch; 200 - a variable gain amplifier; 201 - an array of variable resistors R1. DETAILED DESCRIPTION
[0019] The multi-mode variable gain amplifier of the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation modes.
[0020] As shown in the figure, the multi-modal variable gain amplifier of the utility model includes a first power supply 100, a charge pump 101, a switching component, and a variable gain amplifier 200, wherein the first power supply is a low-voltage DC power supply, which is mainly used to provide low-voltage DC power supply for subsequent circuits; the charge pump is used to convert the low-voltage DC voltage provided by the first power supply into a high-voltage DC voltage, and provide high-voltage DC power supply for the variable gain amplifier; the switching component is used to realize the switching between low-voltage DC power supply and high-voltage DC power supply for the variable gain amplifier, thereby realizing different mode selections; the variable gain amplifier is used to realize variable gain output; the switching component includes a first selection switch 102 and a second selection switch 103, wherein the first selection switch 102 is a high-voltage power selection switch; the second selection switch 103 is a low-voltage power selection switch;
[0021] As for the circuit structure, the first power supply 100 is an external low-voltage DC power supply voltage, which is used to provide power for the entire system; the input end of the charge pump 101 is connected to the first power supply 101, and the output end of the charge pump 101 is connected to the first selection switch 102, which is used to boost the input low-voltage DC voltage to achieve high-voltage DC voltage output; one side of the first selection switch 102 is connected to the output end of the charge pump 101, and the other side of the first selection switch 102 is connected to the variable gain amplifier 200, which is turned on and off under the action of the control signal;
[0022] One side of the second selection switch 103 is connected to the first power supply 100, thereby realizing low-voltage DC power supply for subsequent circuits through the first power supply 100, and the other side of the second selection switch 103 is connected to the variable gain amplifier 200, which is turned on and off under the action of the control signal; the first selection switch 102 and the second selection switch 103 determine the power supply voltage of the variable gain amplifier 200, and then select the working mode of the variable gain amplifier 200, thereby realizing different power supply modes of the variable gain amplifier; the first selection switch 102 and the second selection switch 103 are connected through the power supply end of the variable gain amplifier, and while realizing variable gain output, it can work in different modes, that is: under the action of the two selection switches, low power consumption output under low voltage power supply and high swing and high dynamic range output under high voltage power supply are realized.
[0023] Furthermore, the charge pump 101 is composed of a two-stage cross-coupling structure. Figure 2It can be seen that the charge pump is composed of four NMOS tubes (NM1, NM2, NM3, NM4), two PMOS tubes (PM1, PM2) and four boost capacitors (C1, C2, C3, C4), wherein the NMOS tube realizes triple boost under the action of non-overlapping clocks (Φ1, Φ2, Φ3, Φ4), and the PMOS tube is used to realize the rectification of high-voltage excitation, thereby outputting a high-voltage DC voltage. Specifically, the source ends of NM1 and NM2 are connected to the first circuit. Source 100, the drain of NM1 is connected to the gate of NM2, the right plate of the boost capacitor C1 and the source of NM3, the drain of NM2 is connected to the gate of NM1, the left plate of the boost capacitor C2 and the source of NM4, the left plate of the boost capacitor C1 is connected to the clock signal Φ1, the right plate of the boost capacitor C2 is connected to the clock signal Φ2, and the cross-coupled NM1 tube, NM2 tube, boost capacitor C1, boost capacitor C2 are controlled by non-overlapping clocks Φ1 and Φ2 to achieve Double boost; the source of NM3 is connected to the drain of NM1, the drain of NM3 is connected to the gate of NM4, the right plate of the boost capacitor C3 and the drain of PM1, the source of NM4 is connected to the drain of NM2, the drain of NM4 is connected to the gate of NM3, the left plate of the boost capacitor C4 and the drain of PM2, the left plate of the boost capacitor C3 is connected to the clock signal Φ3, the left plate of the boost capacitor C4 is connected to the clock signal Φ4, the cross-coupled NM3 tube, NM4 The tube, boost capacitor C3, and boost capacitor C4 realize triple boost under the control of non-overlapping clocks Φ3 and Φ4; PM1 and PM2 are PMOS tubes, whose source ends are connected to realize the output of high-voltage DC voltage, the gate of PM1 is connected to the drain of PM2 and the left plate of boost capacitor C4, and the gate of PM2 is connected to the drain of PM1 and the right plate of boost capacitor C3. The cross-coupled PM1 tube and PM2 tube realize the function of high-voltage rectification, and then output triple high-voltage DC voltage.
[0024] Furthermore, the variable gain amplifier 200 is composed of a variable resistor R1, an amplifying resistor R2 and a single-ended output operational amplifier A. Figure 3 It can be seen that it includes a variable resistor R1, a single-ended output operational amplifier A connected to the output end of the variable resistor R1, and an amplifying resistor R2 connected across the single-ended output operational amplifier A. The resistance value of the variable resistor R1 has three options, namely the resistance values of the resistor R3, the resistor R4, and the resistor R5. The resistor R3 is connected to the switch M1, the resistor R4 is connected to the switch M2, and the resistor R5 is connected to the switch M3 and can realize different resistance value selection under the action of the switch M1, the switch M2, and the switch M3, thereby realizing variable gain output. The specific circuit structure is: the left port of the variable resistor R1 is connected to the input signal V inThe right end of the variable resistor R1 is connected to the left port of the amplifier resistor R2 and the negative input port of the operational amplifier. The variable resistor R1 is composed of a resistor array 201 composed of R3, R4, and R5 and corresponding selection switches M1, M2, and M3. The resistance of R4 is twice that of R3, and the resistance of R5 is twice that of R4. Therefore, under the action of the selection switches M1, M2, and M3, the variable gain amplifier can achieve a minimum gain change step of 6dB. The left end of the amplifier resistor R2 is connected to the negative input terminal of the operational amplifier A and the right port of the variable resistor R1, and the right end of the amplifier resistor R2 is connected to the output port of the operational amplifier A and the output signal V out , the amplifier resistor R2 is used to achieve a gain of - output; the variable gain amplifier can realize low-voltage power supply and high-voltage power supply under the action of the first selection switch 102 and the second selection switch 103. When the power supply is low, low power consumption output can be achieved. When the power supply is high, large swing and high dynamic range output can be achieved, thereby meeting different application requirements at the same time.
[0025] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.
Claims
1. A multi-mode variable gain amplifier, characterized in that: The invention comprises a first power supply (100) for low-voltage direct current power supply, a charge pump (101) connected to the first power supply and used for converting a low-voltage direct current voltage provided by the first power supply into a high-voltage direct current voltage, and a variable gain amplifier (200) for realizing variable gain output, wherein a switching component for switching between low-voltage direct current power supply and high-voltage direct current power supply is provided between an input end of the variable gain amplifier (200) and the first power supply (100) and between an input end of the variable gain amplifier (200) and the charge pump (101).
2. The multi-mode variable gain amplifier according to claim 1, characterized in that: The switching component comprises a first selection switch (102) arranged between an output end of a charge pump (101) and an input end of a variable gain amplifier (200), and a second selection switch (103) arranged between a first power supply (100) and an input end of the variable gain amplifier (200).
3. The multi-mode variable gain amplifier according to claim 1 or 2, characterized in that: The first power supply (100) is a low-voltage direct current power supply.
4. The multi-mode variable gain amplifier according to claim 3, characterized in that: The charge pump (101) is constructed using a two-stage cross-coupling structure.
5. The multi-mode variable gain amplifier according to claim 4, characterized in that: The charge pump is composed of four NMOS tubes, two PMOS tubes and four boost capacitors.
6. The multi-mode variable gain amplifier according to claim 1, characterized in that: The variable gain amplifier (200) is composed of a variable resistor R1, a single-ended output operational amplifier A connected to the output end of the variable resistor R1, and an amplifying resistor R2 connected across the single-ended output operational amplifier A.
7. The multi-mode variable gain amplifier according to claim 6, characterized in that: The resistance value of the variable resistor R1 has three options, namely the resistance values of resistor R3, resistor R4 and resistor R5. The resistor R3 is connected to switch M1, the resistor R4 is connected to switch M2, and the resistor R5 is connected to switch M3 and can achieve different resistance value selections under the action of switch M1, switch M2 and switch M3.