Transconductance amplifier with low power consumption and high linearity

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...

AI Technical Summary

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 decrease β; paradoxically, increasing I SS It will increase power consumption, and reducing β will reduce the common-mode input range, so traditional amplifiers do not have high linearity, low power consumption and wide input range at the same time.

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