High-gain complementary metal oxide operation amplifier

Abstract

The amplifier is composed of transistor and resistance which are prepared on the substrate. The source electrodes of amplifying tubes M1 and M2 are connected with earth separately through transistor M7 as two dissipative transistors M8 and M9 are connected with output electrode of amplifying tube M1 in series with M9 output end being connected to power source through constant-current source M4 and output end of amplifying tube M2 is connected with power source, bias voltage Mbias 1 and Vbias2 through constant-current source M3 as Vbias 2 being used to provide grid voltage for transistor M8 and M9 with its dynamic operative range of 3V and its gain up to 100 db within the entire operative range.

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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