Internal Power Supply Structure without Op Amp for Base Current Compensation

Abstract

The invention relates to an operational-amplifier-free internal power supply structure capable of allowing base electrode current compensation to be achieved. The operational-amplifier-free internal power supply structure comprises a band-gap reference voltage generation module which is used for generating band-gap reference voltages, and a base electrode current compensation module which is used for generating image currents with the same magnitude as the magnitude of consumed base electrode currents and feeding the image currents back to base electrodes of triodes of the band-gap reference voltage generation module. The band-gap reference voltage generation module comprises the first triode, the second triode, a current mirror, a first resistor, a second resistor, a third resistor and a fourth resistor, wherein the first triode and the second triode are in common base connection. By means of the operational-amplifier-free internal power supply structure capable of allowing base electrode current compensation to be achieved, the structure is adopted, by detecting the base electrode currents of the triodes and backfilling the same magnitude of currents through the current mirror, the influences of currents of the base electrodes of the triodes on internal supply voltages are eliminated on the basis that the operational-amplifier-free internal power supply structure is kept simple and convenient to compensate, more stable band-gap reference voltages can be obtained, and the operational-amplifier-free internal power supply structure has a wider application range.

Description

technical field [0001] The invention relates to the field of circuit technology, in particular to the field of realizing stable power supply inside a chip, and specifically refers to an internal power supply structure without an operational amplifier for realizing base current compensation. Background technique [0002] Almost all circuitry requires an internal voltage regulator block. Having an internal regulated power supply that does not change with external power supply voltage, process parameters and temperature is often the basis for a chip to work normally and accurately. [0003] The traditional chip internal regulated power supply is usually obtained by bandgap reference module, op amp, adjustment device and resistor. Its structure is as figure 1 As shown, first a voltage V that does not vary with power supply, process, and temperature is obtained by the bandgap reference module 101 BG (Usually 1.25V), and then connect this voltage to one end of the op amp 102 (t...

AI Technical Summary

Problems solved by technology

However, in some MOS processes, the magnification of the NPN tube is limited and varies with temperature and process, which causes the base current to change, and the internal power supply voltage also changes with the change of the base current.

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