Low-power consumption three-level operational amplifier for driving large-load capacitor

Abstract

The invention discloses a low-power consumption three-level operational amplifier for driving a large-load capacitor. The amplifier is composed of fifteen MOS transistors, two capacitors and a resistor Ra, wherein the fifteen MOS transistors comprise the first PMOS transistor M10, the second PMOS transistor M11, the third PMOS transistor M13, the fourth PMOS transistor M17, the fifth PMOS transistor M18, the sixth PMOS transistor M21, the seventh PMOS transistor M24, the eighth PMOS transistor M31, the first NMOS transistor M13, the second NMOS transistor M14, the third NMOS transistor M15, the fourth NMOS transistor M16, the fifth NMOS transistor M22, the sixth NMOS transistor M23 and the seventh NMOS transistor M30; the two capacitors comprise the first compensation capacitor Cm and the second compensation capacitor Ca. Compared with the prior art, the three-level operational amplifier can drive the large-load capacitor (hundreds of pF) under the low-voltage low-power consumption (microW) condition, and has a large gain bandwidth product and a better swing rate.

Description

technical field [0001] The invention relates to a low-voltage low-power multistage operational amplifier, in particular to a low-voltage low-power multistage operational amplifier. Background technique [0002] The technical research of low-voltage and low-power multi-stage operational amplifiers has always been a very active research field for low-power circuits. The compensation technology of multi-stage operational amplifiers can be widely used in portable electronic devices, such as mobile phone batteries, notebook batteries, LDOs, etc. . In recent years, due to the inherent limitations of the well-known multi-stage compensation method for three-stage operational amplifiers—Nested Miller Compensation (NMC), namely: the compensation technology has a right-half-plane zero point and two large compensation capacitors; these deficiencies greatly It limits its application in low-voltage and low-power multi-stage operational amplifier circuits. Subsequently, many compensation...

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Problems solved by technology

However, the above technologies also have some shortcomings, for example: some compensation capacitors are proportional to the load capacitance, resulting in an increase in the chip area, and the final manufacturing cost of the circuit is also increased; so the later compensation technology began to make the area of ​​the compensation capacitor proportional to the load capacitance. Geometric mean, which greatly saves the area of ​​the chip

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