Overvoltage protection circuit and overvoltage protection method of CMOS power amplifier

Abstract

The invention discloses an overvoltage protection circuit and an overvoltage protection method of a CMOS power amplifier. The circuit comprises a stack tube circuit, a voltage sensor, a voltage amplitude limiter and a subtracter, one end of the tube stacking circuit is connected with the voltage sensor and the voltage amplitude limiter, and the other end of the tube stacking circuit is connected with the subtracter. According to the circuit, a voltage limiter and a subtracter of a voltage sensor are additionally arranged on the basis of an original stack tube circuit; the two MOS tubes in thestacked tube circuit are protected against breakdown under the limit working condition, the voltage of the whole CMOS power amplifier circuit under the limit condition can be adjusted to be within thesafety range according to the negative feedback adjustment principle, and the circuit is simple and reasonable in design, safe and reliable. Meanwhile, the method can improve the safety and reliability of the CMOS power amplifier, and guarantees that the CMOS power amplifier can still work safely under the overvoltage condition.

Description

technical field [0001] The invention relates to the technical field of integrated circuit design, and more specifically relates to an overvoltage protection circuit and an overvoltage protection method of a CMOS power amplifier. Background technique [0002] At present, the CMOS process has become the mainstream process for digital circuits, analog circuits, and even radio frequency integrated circuits and millimeter wave integrated circuits due to its high integration, high yield, low cost, and devices that can further benefit from technological progress. However, in the field of power amplifiers, the CMOS process has not been well applied. The main reason is that compared with the traditional GaAs HBT (Gallium Arsenide Heterojunction Bipolar Transistor), the breakdown voltage of CMOS is relatively low. Among them, if you need to design a power amplifier, usually the structure is as follows figure 1 as shown, figure 1 Medium, M 1 is the main amplifying tube of the power ...

AI Technical Summary

Problems solved by technology

[0010] In view of this, the present invention provides an overvoltage protection circuit and an overvoltage protection method for a CMOS power amplifier. The circuit protects the stacked tube circuit by adding a voltage sensor voltage limiter and a subtractor on the basis of the original stacked tube circuit. The two MOS tubes in the circuit will not be broken down under extreme working conditions. Through the negative feedback regulation principle, the voltage of the entire CMOS power amplifier circuit under extreme conditions can be adjusted to a safe range, which solves the problem of high voltage in the existing CMOS power amplifier. It cannot be guaranteed that it can still be intact under extreme conditions, the reliability of the power amplifier is low, and the working safety is difficult to guarantee.

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