High-gain complementary metal oxide operation amplifier

Abstract

The high-gain complementary metal-oxide operational amplifier relates to a high-input range, high-gain complementary metal-oxide operational amplifier, which is especially suitable for occasions that do not require very high unity-gain bandwidth, for example, it can be used in circuits such as reference voltage sources, The sources of the first and second amplifying tubes (M1, M2) are respectively connected to the ground through a transistor (M7) and a resistor, and two resistive transistors are sequentially connected in series at the output pole of the first amplifying tube (M1), namely The first and second resistive transistors (M8, M9), the output terminal of the second resistive transistor (M9) is connected to the power supply through the first constant current source (M4), and the output terminal of the second amplifier tube (M2) is connected to the power supply through the first constant current source (M4). Two constant current sources (M3) are connected to the power supply, and there are two bias voltages, one bias voltage is provided to the gates of the first and second resistive transistors (M8, M9); the other bias voltage is provided to the Gate of transistor (M7) connected to ground.

Description

1. Technical field [0001] The invention relates to a high-input range, high-gain complementary metal oxide operational amplifier, which is especially suitable for occasions where the requirement for unity gain bandwidth is not very high, such as being used in circuits such as reference voltage sources, and belongs to the manufacture of operational amplifiers. technology field. 2. Background technology [0002] The operational amplifier is a very important unit circuit. In analog integrated circuits and digital-analog hybrid integrated circuits, the design of operational amplifiers is particularly critical. The performance of operational amplifiers often directly affects the overall performance of the entire integrated circuit system. Therefore, operational amplifier design It has always been one of the hottest directions in integrated circuit systems. The input range of the traditional CMOS two-stage operational amplifier is small; especially the CMOS process is developing ...

AI Technical Summary

Problems solved by technology

The input range of the traditional CMOS two-stage operational amplifier is small; especially the CMOS process is developing towards a small size, and the size of the tube is reduced, which will lead to a decrease in the output resistance, so the gain is not high; and in the frequency compensation, the resistor must be connected in series. to cancel zero

[0003] In order to increase the input range, the resistor is connected in series with the source stage of the CMOS amplifier, however, this will further reduce the gain of the op amp

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