Voltage reference source adopting technique deviation compensation structure

Abstract

A voltage reference source adopts a process deviation compensating structure, wherein a process deviation compensating resistance is connected with the base electrode of a transistor, which ensures that the sum of the base electrode-emitter electrode voltage of the transistor and the voltage of the process deviation compensating resistance Rb1 can not be influenced by process deviation; therefore, the high precision voltage reference source, which has high initial precision and does not need correction, can be obtained.

Description

technical field [0001] The invention relates to a voltage reference source widely used in power supply chips, in particular to a voltage reference source adopting a process deviation compensation structure in a mixed signal chip. Background technique [0002] High-precision, low-cost voltage reference module is an important part of analog circuits and digital-analog hybrid circuits. At present, high-precision voltage reference sources are mainly manufactured using bipolar technology and BiCMOS technology, and after the chip is completed, special correction technology is required to ensure its accuracy. However, these processes are complicated in technology, high in manufacturing cost, and incompatible with mainstream CMOS processes, and corrections to chips one by one will greatly reduce production efficiency. [0003] The current CMOS integrated circuits occupy about 90% of the market. Highly integrated products and mixed integration of digital and analog circuits have bec...

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Problems solved by technology

[0022] 2) Deviation of pnp transistor characteristics

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