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Amplifier circuit applied to low power consumption system

An amplifier circuit and low power consumption technology, which is applied in the field of amplifier circuits of low power consumption systems, can solve problems such as increasing system power consumption, and achieve the effect of increasing power consumption

Inactive Publication Date: 2014-07-30
CHINA KEY SYST & INTEGRATED CIRCUIT
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing circuit structure of adding a source follower circuit after the amplifier circuit will inevitably increase the power consumption of the entire system

Method used

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  • Amplifier circuit applied to low power consumption system

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Embodiment Construction

[0013] Such as figure 1 Shown is a schematic diagram of the circuit structure of the amplifier circuit applied to the low power consumption system of the present invention.

[0014] The CMOS transistor M1, the resistor R1 and the CMOS transistor M3 constitute the amplification of the input positive signal INP, the input positive signal INP is input from the gate terminal of the CMOS transistor M1, and after being amplified by the CMOS transistor M1, the drain terminal of the CMOS transistor M1 Output, the amplified signal is input from the gate terminal of CMOS transistor M3 after being directly blocked by capacitor C1, and then output from the source terminal of CMOS transistor M3. Since the resistance seen from the source terminal of CMOS transistor M3 is very small, only 1 / gm3, where gm3 is the transconductance of the CMOS transistor M3, so the CMOS transistor M3 has a good function of driving the subsequent circuit.

[0015] At the same time, the CMOS transistor M2, the ...

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Abstract

The invention discloses an amplifier circuit applied to a low power consumption system. The amplifier circuit comprises CMOSs (Complementary Metal-Oxide-Semiconductor Transistors) M1, M2, M3 and M4, resistors R1, R2, R3 and R4, capacitors C1 and C2 and a current source IDC, wherein the source end of the M1 is respectively connected to the source end of the M2 and the upper end of the IDC, the R1 is connected between the drain end of the M1 and the source end of the M3, and the C1 is connected between the drain end of the M1 and the grid end of the M3; the R3 is connected between the grid end of the M3 and a power supply VDD, and the drain end of the R3 is connected with the power supply VDD; the R2 is connected between the drain end of the M2 and the source end of the M4, and the C2 is connected between the drain end of the M2 and the grid end of the M4; the R4 is connected between the grid end of the M4 and the power supply VDD, and the drain end of the M4 is connected with the power supply VDD. The amplifier circuit has the beneficial effects that amplification of an input signal is realized in a first-level amplifier, a function of driving a backward-stage circuit is provided, and the amplifier circuit is very suitable for being applied to the low power consumption system.

Description

technical field [0001] The invention relates to an amplifier circuit, in particular to an amplifier circuit applied to a low power consumption system. Background technique [0002] In the field of integrated circuits, amplifiers are commonly used to amplify signals, and existing amplifiers generally only provide amplification functions. If it is necessary to drive the subsequent circuit, it is generally necessary to add a source follower circuit after the amplifier circuit. The existing circuit structure of adding a source follower circuit behind the amplifier circuit will inevitably increase the power consumption of the entire system. Contents of the invention [0003] The purpose of the present invention is to provide an amplifier circuit applicable to low power consumption systems, so as to overcome the above mentioned disadvantages in the background art. [0004] To achieve the above object, the present invention is achieved through the following technical solutions: ...

Claims

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Application Information

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IPC IPC(8): H03F1/02
Inventor 黄磊马杰
Owner CHINA KEY SYST & INTEGRATED CIRCUIT
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