Transconductance amplifier with low power consumption and high linearity

A transconductance amplifier, high linearity technology, applied in the direction of differential amplifiers, DC coupled DC amplifiers, improved amplifiers to improve efficiency, etc., can solve the problem of increased power consumption, amplifiers that do not have high linearity, low power consumption and wide bandwidth Issues such as input range and reduction of common-mode input range achieve high power supply rejection ratio, simple structure, and low power consumption

Inactive Publication Date: 2014-05-28
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0004] The OTA linearity achieved by the traditional source-coupled differential amplifier structure is limited by the tail current I SS and β ( ), if you want to increase the linear input range, you must increase the tail current I SS or dec

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  • Transconductance amplifier with low power consumption and high linearity
  • Transconductance amplifier with low power consumption and high linearity
  • Transconductance amplifier with low power consumption and high linearity

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Embodiment Construction

[0029] Below in conjunction with accompanying drawing, describe technical scheme of the present invention in detail:

[0030] The low power consumption and high linearity transconductance amplifier of the present invention comprises a Rail-to-Rail input stage, a Push-Pull push-pull output stage and a bias circuit, wherein the low power consumption and high linearity Push-Pull transconductance amplifier adopts a source Resistor-connected negative feedback structure (figure 1 ) to achieve high linear transconductance, separated from the source resistor negative feedback structure ( figure 2 ) Compared with the voltage drop at the source end, it will not increase, which ensures a wide range of common-mode levels for the joint action of the double differential pair of tubes; at the same time, the low-power and high-linearity Push-Pull transconductance amplifier adopts current transmission to amplify the push-pull output stage The output drive capability is large, and it can drive...

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Abstract

The invention relates to the technical field of simulative integrated operational amplifiers, in particular to a Push-Pull transconductance amplifier with low power consumption and high linearity. The transconductance amplifier comprises a biasing circuit, a Rail-to-Rail input stage and a Push-Pull output stage which are connected in sequence, wherein the biasing circuit is formed by an image current telescope and is used for providing bias voltage for the Rail-to-Rail input stage and the Push-Pull output stage; the Rail-to-Rail input stage adopts a folding NMOS (N-Channel Metal Oxide Semiconductor) differential pair and a PMOS (P-Channel Metal Oxide Semiconductor) differential pair to realize rail-to-rail in a common-mode input range, and adopts negative feedback of a source electrode to realize linear transconductance; the Push-Pull output stage adopts bias with low power consumption to realize push-pull output with low power consumption, and adopts image current amplification to improve the output driving capacity. The transconductance amplifier has the advantages of simple structure, high linearity, low power consumption, high power supply rejection ratio, small chip area and the like, and is particularly suitable for the transconductance amplifier.

Description

technical field [0001] The invention relates to the technical field of analog integrated operational amplifiers, in particular to a Push-Pull transconductance amplifier with low power consumption and high linearity. Background technique [0002] Operational transconductance amplifier (OTA), as one of the important foundations and key modules in the analog circuit system, is widely used in power supply, power amplification, signal processing and other systems. The performance level of the operational amplifier directly determines the performance of the entire system. Since different application occasions have different requirements on the parameters of operational transconductance amplifiers, the design of operational transconductance amplifiers is mostly based on the requirements of the application system for its performance indicators. [0003] In the field of switching power supplies, the error amplifier, which is the core of the voltage control loop, has different index r...

Claims

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Application Information

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IPC IPC(8): H03F1/02H03F1/32H03F3/45
Inventor 周泽坤张其营张瑜王霞石跃明鑫王卓张波
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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