Current feedback type instrument amplifier with low power consumption and low noise

Abstract

The invention discloses a current feedback type instrument amplifier with low power consumption and low noise. The amplifier is composed of an input preprocessing circuit I0, an operational transconductance amplification circuit I1 and a capacitive feed-back network I2, wherein the operational transconductance amplification circuit I1 comprises an input transconductance branch circuit and a feed-back transconductance branch circuit. Under the condition of same transistor length, the width to length ratio of an input transconductance difference transistor pair, namely a PMOS transistor PM10 and a PMOS transistor PM11, is N times of the width to length ratio of a feed-back transconductance difference transistor pair, namely a PMOS transistor PM12 and a PMOS transistor PM13, and the width to length ratio of a bias transistor pair, namely a PMOS transistor PM14 is N times of the width to length ratio of a PMOS transistor PM15, wherein N is greater than 1. By geometric scaling of the current of the feed-back transconductance branch circuit and the width to length ratio of the transistors of the feed-back transconductance branch circuit, the power consumption and noise of the current feedback type instrument amplifier are reduced.

Description

technical field [0001] The invention relates to the technical field of integrated circuit design, in particular to a low-power consumption and low-noise current feedback instrumentation amplifier. Background technique [0002] With the rapid development of biomedical sensing technology and integrated circuit technology, more and more portable wearable devices are powered by batteries. The development of integrated circuits with low power consumption and low noise is the basis for realizing high-quality and durable portable electronic systems. And the urgent need, low power consumption and low noise design is an important optimization design goal of portable electronic equipment. [0003] For the noise and DC offset problems faced by biomedical low-frequency signal acquisition in wearable devices, the current common method is to use techniques such as chopping to optimize performance. The common-mode offset voltage in biomedical signal processing can be suppressed by the DC ...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is the problem of large noise and high power consumption in the existing current feedback instrumentation amplifier, and a low power consumption and low noise current feedback instrumentation amplifier is provided

Images