All-SiC CMOS operational amplifier with temperature stability

Abstract

The embodiment of the invention discloses a full SiCCMOS operational amplifier with temperature stability, which is characterized in that a first bias voltage is generated through an input stage, a first input signal and a second input signal are subjected to differential amplification to output a first amplified voltage, and the gain of the input stage is regulated and controlled according to an adjustable voltage; the bias circuit outputs a second amplification voltage and a second bias voltage according to the first bias voltage, the first input signal and the second input signal; the output stage generates an output voltage according to the first amplified voltage, the second amplified voltage and the second bias voltage; the attenuation circuit performs voltage value attenuation on the output voltage to output attenuation voltage, and the biasing circuit stabilizes a working point according to the attenuation voltage; and the compensation circuit reversely amplifies the attenuation voltage and then outputs compensation voltage to the output stage so as to adjust the magnitude of the output voltage. The gain of the input stage is irrelevant to temperature-sensitive process parameters, and the problem that the temperature stability of the gain of an existing full-SiCCMOS operational amplifier is poor is solved.

Description

Technical field [0001] The present invention relates to the field of electronic technology, in particular to a full SiC CMOS operational amplifier having temperature stability. Background [0002] Ordinary Si (silicon) CMOS (complementary metal oxide semiconductor) integrated circuits can work normally at room temperature, if the ambient temperature rises will make the internal carrier of the MOS tube increase rapidly, resulting in an increase in current, easy to burn devices and even circuits; Therefore, Si CMOS integrated circuits need to increase the cooling device when working in a high temperature environment, so that although the processed circuit can work, the circuit is large and the thermal stability is poor, and it is not easy to integrate; This instability at high temperatures is determined by the properties of semiconductor materials. [0003] As the most basic analog circuit unit, the operational amplifier is widely used in various integrated circuits, and can be com...

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Problems solved by technology

[0004] In view of the above technical problems, an embodiment of the present invention provides a full SiC CMOS operational amplifier with temperature stability to solve the problem of poor temperature stability of the gain of the existing operational amplifier made of SiC material

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