A low power low noise amplifier with a wide linear input range

Abstract

The present application discloses a low-power low-noise amplifier with a large linear input range, including a power supply input terminal VDD, a signal input terminal, a reference voltage generator VoltGen, a differential amplifier module, a differential to single-ended module, a load resistor RL, an output module, a signal output terminal, and a voltage output terminal; the reference voltage generator VoltGen includes a power supply bias voltage terminal, a first bias voltage output terminal, and a second bias voltage output terminal; the power supply bias voltage terminal, the first bias voltage output terminal, the second bias voltage output terminal, and the signal input terminal are respectively connected to the differential amplifier module; the differential to single-ended module is connected to the differential amplifier module; the output module is connected to the differential amplifier module, and the output terminal of the output module is connected to the signal output terminal; the load resistor RL is respectively connected to the differential amplifier module, the differential to single-ended module, the output module, and the voltage output terminal. The present application has a large input range, is suitable for low-voltage working mode, and has low noise and high linearity.

Description

Technical Field

[0001] The present application relates to the technical field of amplifier structure, and in particular to a low-power low-noise amplifier with a large linear input range. Background Art

[0002] In some low-power and low-cost applications of continuous signal amplification, the output impedance of the input signal is large and the voltage variation range is large, but the linearity of the output signal is relatively high and the noise requirement is relatively low. At the same time, the output end of the signal is connected to the power port of the chip to provide power to the chip. Therefore, there are also high requirements for PSR. In the prior art of using a feedback loop to determine the gain, there is a problem of noise introduction and area increase due to the large resistance value of the resistor on the feedback path. Therefore, an open-loop amplifier structure is needed to solve this problem. Summary of the invention

[0003] The present application aims to solve the above technical problems and provide a low-power low-noise amplifier with a large linear input range to improve linearity and reduce noise.

[0004] To achieve the above-mentioned purpose, the present application discloses a low-power low-noise amplifier with a large linear input range, including a power supply input terminal VDD, a signal input terminal, a reference voltage generator VoltGen, a differential amplifier module, a differential to single-ended module, a load resistor RL, an output module, a signal output terminal, and a voltage output terminal; the reference voltage generator VoltGen includes a power supply bias voltage terminal, a first bias voltage output terminal, and a second bias voltage output terminal; the power supply bias voltage terminal, the first bias voltage output terminal, the second bias voltage output terminal, and the signal input terminal are respectively connected to the differential amplifier module, and are used to convert the single-ended input signal into a differential signal output; the differential to single-ended module is connected to the differential amplifier module, and is used to convert the differential signal into a single-ended signal output and reduce the DC component of the output stage; the output module is connected to the differential amplifier module, and the output terminal of the output module is connected to the signal output terminal; the load resistor RL is respectively connected to the differential amplifier module, the differential to single-ended module, the output module, and the voltage output terminal.

[0005] Preferably, the differential amplifier module includes an amplifier Q0, an amplifier Q1, an amplifier Q2, an amplifier Q3, and an amplifier Q4; the gate of the amplifier Q0 is connected to the power supply bias voltage terminal to obtain a bias voltage Vbias that causes the differential amplifier module and the differential to single-ended module to generate current; the drain of the amplifier Q0 is connected to the source of the amplifier Q1 and the source of the amplifier Q2; the source of the amplifier Q0 is grounded; the gate of the amplifier Q1 is connected to the first bias voltage output terminal to obtain a bias voltage Vref1, and the gate of the amplifier Q1 is connected to the first bias voltage output terminal through a coupling capacitor. The signal input terminal is connected for inputting a signal Vsignal; the drain of the amplifier Q1 is connected to the drain of the amplifier Q3; the gate of the amplifier Q2 is connected to the second bias voltage output terminal for obtaining a bias voltage Vref2; the drain of the amplifier Q2 is connected to the drain of the amplifier Q4; the gate of the amplifier Q3 is short-circuited with its drain; the source of the amplifier Q3 is connected to the power supply input terminal VDD through a load resistor RL; the gate of the amplifier Q4 is short-circuited with its drain; the source of the amplifier Q4 is connected to the power supply input terminal VDD through the load resistor RL.

[0006] Preferably, the differential-to-single-ended module includes an amplifier Q5, an amplifier Q6, an amplifier Q7, an amplifier Q8, and an amplifier Q9; the gate of the amplifier Q5 is connected to the gate of the amplifier Q4, and the drain thereof is connected to the drain of the amplifier Q7; the source of the amplifier Q5 is connected to the power supply input terminal VDD through the load resistor RL; the gate of the amplifier Q6 is connected to the gate of the amplifier Q3, and the drain thereof is connected to the drain of the amplifier Q9; the source of the amplifier Q6 is connected to the power supply input terminal VDD through the load resistor RL; the drain of the amplifier Q7 is short-circuited to the gate, and the source thereof is grounded; the gate of the amplifier Q8 is connected to the gate of the amplifier Q7, and the drain thereof is connected to the drain of the amplifier Q6; the source of the amplifier Q8 is grounded; the drain of the amplifier Q9 is short-circuited to its gate, and is connected to the drain of the amplifier Q6; the gate of the amplifier Q9 is connected to the output module, and the source of the amplifier Q9 is grounded.

[0007] Preferably, the output module comprises an amplifier Q10, the gate of the amplifier Q10 is connected to the gate of the amplifier Q9, and the drain of the amplifier Q10 is connected to the power supply input terminal VDD via a load resistor RL; the source of the amplifier Q10 is grounded.

[0008] Preferably, the voltage output end is connected between the load resistor RL and the output module.

[0009] Beneficial effects of the present application: The low-power low-noise amplifier with a large linear input range of the present application, through the structural setting of the signal input terminal, the reference voltage generator VoltGen, the differential amplifier module, the differential to single-ended module, the load resistor RL, the output module, and the signal output terminal, makes the low-power low-noise amplifier with a large linear input range of the present application have a large input range, is suitable for low-voltage working mode, and has lower noise and higher linearity. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0011] Figure 1 It is a structural block diagram of a low-power low-noise amplifier with a large linear input range according to an embodiment of the present application;

[0012] Figure 2 It is a circuit schematic diagram of a low-power low-noise amplifier with a large linear input range according to an embodiment of the present application. DETAILED DESCRIPTION

[0013] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this application.

[0014] Example: Reference Figure 1 A low-power low-noise amplifier with a large linear input range is shown, including a power supply input terminal VDD, a signal input terminal, a reference voltage generator VoltGen, a differential amplifier module, a differential to single-ended module, a load resistor RL, an output module, a signal output terminal, and a voltage output terminal.

[0015] The reference voltage generator VoltGen includes a power supply bias voltage terminal, a first bias voltage output terminal, and a second bias voltage output terminal; the power supply bias voltage terminal, the first bias voltage output terminal, the second bias voltage output terminal, and the signal input terminal are respectively connected to the differential amplifier module for converting the single-ended input signal into a differential signal output.

[0016] The load resistor RL is respectively connected to the differential amplifier module, the differential to single-ended module, the output module, and the voltage output terminal.

[0017] The voltage output terminal is connected between the load resistor RL and the output module.

[0018] The differential to single-ended module is connected to the differential amplifier module to convert the differential signal to a single-ended signal output and reduce the DC component of the output stage. Figure 2 As shown, in this embodiment, the differential amplifier module includes an amplifier Q0, an amplifier Q1, an amplifier Q2, an amplifier Q3, and an amplifier Q4.

[0019] The gate of amplifier Q0 is connected to the power supply bias voltage terminal to obtain the bias voltage Vbias that causes the differential amplifier module and the differential to single-ended module to generate current; the gate of amplifier Q0 is connected to the source of amplifier Q1 and the source of amplifier Q2; the source of amplifier Q0 is connected to the output module.

[0020] The gate of amplifier Q1 is connected to the first bias voltage output terminal for obtaining bias voltage Vref1. The gate of amplifier Q1 is connected to the signal input terminal through a coupling capacitor for inputting signal Vsignal. The drain of amplifier Q1 is connected to the drain of amplifier Q3. Signal Vsignal is coupled to the gate of amplifier Q1 through capacitor. When the output impedance of amplifier Q0 is large enough, the output current is not affected by amplifier Q1 and amplifier Q2. Through appropriate size adjustment, Gm1+Gm2 and Gm3+Gm4 will remain unchanged within a relatively large input signal variation range, that is, the gain is constant.

[0021] The gate of the amplifier Q2 is connected to the second bias voltage output terminal for obtaining the bias voltage Vref2; the source of the amplifier Q2 is connected to the drain of the amplifier Q4.

[0022] The gate of the amplifier Q3 is short-circuited with its drain; the source of the amplifier Q3 is connected to the power supply input terminal VDD through a load resistor RL.

[0023] The gate of the amplifier Q4 is short-circuited with its drain; the source of the amplifier Q4 is connected to the power supply input terminal VDD through a load resistor RL.

[0024] The output module is connected to the differential amplifier module, and the output end of the output module is connected to the signal output end. In this embodiment, the differential to single-ended module includes amplifier Q5, amplifier Q6, amplifier Q7, amplifier Q8, and amplifier Q9.

[0025] The gate of the amplifier Q5 is connected to the gate of the amplifier Q4, and the drain of the amplifier Q5 is connected to the drain of the amplifier Q7; the source of the amplifier Q5 is connected to the power supply input terminal VDD through the load resistor RL.

[0026] The gate of the amplifier Q6 is connected to the gate of the amplifier Q3 , and the drain of the amplifier Q6 is connected to the drain of the amplifier Q9 ; the source of the amplifier Q6 is connected to the power supply input terminal VDD via the load resistor RL.

[0027] The drain and gate of amplifier Q7 are shorted, and the drain is grounded.

[0028] The gate of the amplifier Q8 is connected to the gate of the amplifier Q7, and the drain thereof is connected to the drain of the amplifier Q6; the source of the amplifier Q8 is grounded.

[0029] The drain of amplifier Q9 is short-circuited with its gate and connected to the drain of amplifier Q6; the gate of amplifier Q9 is connected to the output module, and the source of amplifier Q9 is connected to the signal output terminal. Amplifiers Q5, Q7, and Q8 can reduce the DC current component on amplifier Q9 without reducing the gain of amplifier Q6, so that amplifier Q9 can work at the edge of the saturation region.

[0030] The output module includes an amplifier Q10, the gate of which is connected to the gate of the amplifier Q9, and the drain of which is connected to the power supply input terminal VDD through the load resistor RL; the source of the amplifier Q10 is connected to the signal output terminal. The current of the amplifier Q10 is the amplification amount of the amplifier Q9, so its DC component is not large, which makes the Vout signal output from the voltage output terminal vary close to VDD, making the operating voltage of the amplifier high.

[0031] The working principle of the low power consumption low noise amplifier with large linear input range in this embodiment is as follows:

[0032] The differential amplifier module is a differential amplifier component with a large linear input range. The differential to single-ended module converts the differential output to a single-ended output while reducing the DC component of the output stage. The output module, i.e. the output stage, has the characteristics of a small DC component. The Vout signal output at the voltage output end has a variation range close to VDD, which makes the operating voltage of the amplifier high.

[0033] The above description is intended to be illustrative and not limiting. Upon reading the above description, many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art. Therefore, the scope of the present teachings should not be determined with reference to the above description, but should be determined with reference to the appended claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to be a waiver of such subject matter, nor should it be considered that the applicant has not considered such subject matter to be part of the disclosed application subject matter.

Claims

1. A low power low noise amplifier with a large linear input range, characterized in that: It includes a power supply input terminal VDD, a signal input terminal, a reference voltage generator VoltGen, a differential amplifier module, a differential to single-ended module, a load resistor RL, an output module, a signal output terminal, and a voltage output terminal; The reference voltage generator VoltGen includes a power supply bias voltage terminal, a first bias voltage output terminal, and a second bias voltage output terminal; the power supply bias voltage terminal, the first bias voltage output terminal, the second bias voltage output terminal, and the signal input terminal are respectively connected to the differential amplifier module, and are used to convert the single-ended input signal into a differential signal output; The differential-to-single-ended module is connected to the differential amplification module, and is used to convert the differential signal into a single-ended signal output and reduce the DC component of the output stage; The output module is connected to the differential amplifier module, and the output end of the output module is connected to the signal output end; The load resistor RL is respectively connected to the differential amplifier module, the differential to single-ended module, the output module, and the voltage output terminal; The differential amplifier module includes an amplifier Q0, an amplifier Q1, an amplifier Q2, an amplifier Q3, and an amplifier Q4; the gate of the amplifier Q0 is connected to the power supply bias voltage terminal to obtain a bias voltage Vbias that causes the differential amplifier module and the differential to single-ended module to generate current; the drain of the amplifier Q0 is connected to the source of the amplifier Q1 and the source of the amplifier Q2; the source of the amplifier Q0 is grounded; The gate of the amplifier Q1 is connected to the first bias voltage output terminal for obtaining the bias voltage Vref1, and the gate of the amplifier Q1 is connected to the signal input terminal through a coupling capacitor for inputting the signal Vsignal; the drain of the amplifier Q1 is connected to the drain of the amplifier Q3; The gate of the amplifier Q2 is connected to the second bias voltage output terminal for obtaining the bias voltage Vref2; the drain of the amplifier Q2 is connected to the drain of the amplifier Q4; The gate of the amplifier Q3 is short-circuited with its drain; the source of the amplifier Q3 is connected to the power supply input terminal VDD via a load resistor RL; The gate of the amplifier Q4 is short-circuited with its drain; the source of the amplifier Q4 is connected to the power supply input terminal VDD through the load resistor RL; The differential to single-ended module includes amplifier Q5, amplifier Q6, amplifier Q7, amplifier Q8, and amplifier Q9; The gate of the amplifier Q5 is connected to the gate of the amplifier Q4, and the drain thereof is connected to the drain of the amplifier Q7; the source of the amplifier Q5 is connected to the power supply input terminal VDD through the load resistor RL; The gate of the amplifier Q6 is connected to the gate of the amplifier Q3, and the drain thereof is connected to the drain of the amplifier Q9; the source of the amplifier Q6 is connected to the power supply input terminal VDD through the load resistor RL; The drain and gate of the amplifier Q7 are short-circuited, and the source is grounded; The gate of the amplifier Q8 is connected to the gate of the amplifier Q7, and the drain of the amplifier Q8 is connected to the drain of the amplifier Q6; the source of the amplifier Q8 is grounded; The drain of the amplifier Q9 is short-circuited with its gate and connected to the drain of the amplifier Q6; the gate of the amplifier Q9 is connected to the output module, and the source of the amplifier Q9 is grounded; The output module includes an amplifier Q10, the gate of the amplifier Q10 is connected to the gate of the amplifier Q9, and the drain of the amplifier Q10 is connected to the power supply input terminal VDD through a load resistor RL; the source of the amplifier Q10 is grounded; The source of the amplifier Q10 is connected to the signal output terminal; The voltage output terminal is connected between the load resistor RL and the output module.

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