cmos operational amplifier with very large dc open-loop voltage gain

Abstract

The invention provides a CMOS (Complementary Metal-Oxide-Semiconductor) operation amplifier with great direct-current open-loop voltage gain. The CMOS operation amplifier comprises a first transistor M0, a second transistor M1, a third transistor M2, a fifth transistor M5, a sixth transistor M6, a seventh transistor M7, an eighth transistor M8, a ninth transistor M9, a tenth transistor M10, an eleventh transistor M11, a twelfth transistor M12, a thirteenth transistor M13, a fourteenth transistor M14, a fifteenth transistor M15, a sixteenth transistor M16, a seventeenth transistor M17 and an eighteenth transistor M18. A feedback loop is formed by the operation amplifier through the transistors M13-M18. Compared with a traditional folding common-source and common-gate amplifier, the CMOS operation amplifier has the advantages of high DC open-loop voltage gain, wide unit gain band width, short built-up time and less power consumption.

Description

technical field [0001] The invention relates to the field of analog circuit design, in particular to a CMOS operational amplifier with a very large DC open-loop voltage gain in the analog circuit. Background technique [0002] Operational amplifiers are usually important modules in analog circuits, and their DC open-loop voltage gain Av is a very important technical parameter. For a traditional op amp, if you want it to have a larger Av, it will consume much more power consumption and area. [0003] Existing operational amplifiers include multiple PMOS (P-channel metal oxide semiconductor FET, P-channel metal oxide semiconductor field effect transistor) transistors and NMOS (N-channel metal oxide semiconductor FET, N-channel metal oxide semiconductor field Effect Transistor) Transistor, through multiple transistors to produce operational amplifier effect. In addition, although some new op amps have higher Av in recent years, the degree of improvement is still limited. [...

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Problems solved by technology

In addition, although some new op amps have higher Av in recent years, the degree of improvement is still limited

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