Band-gap reference voltage source of high power supply voltage rejection ratio

Abstract

The invention relates to a band-gap reference voltage source of high power supply voltage rejection ratio, comprising a start-up circuit (1), a positive and negative temperature coefficient current generation circuit (2), an operational amplifier (3) and a reference voltage generation circuit (4). The direct-current input ends of the start-up circuit (1), the positive and negative temperature coefficient current generation circuit (2), the operational amplifier (3) and the reference voltage generation circuit (4) are respectively connected with a direct-current power supply Vcc; the output end of the start-up circuit (1) is connected with a first input end of the positive and negative temperature coefficient current generation circuit (2); a first output end of the positive and negative temperature coefficient current generation circuit (2) is connected with a first input end of the operational amplifier (3); a second output end of the positive and negative temperature coefficient current generation circuit (2) is connected with a second input end of the operational amplifier (3); a third output end of the positive and negative temperature coefficient current generation circuit (2) is connected with a first input end of the reference voltage generation circuit (4); and the first output end of the operational amplifier (3) is connected with a second input end of the positive and negative temperature coefficient current generation circuit (2).

Description

technical field [0001] The invention relates to a reference voltage source for low temperature coefficient and high power supply rejection ratio which needs to be generated in radio frequency and digital-analog hybrid circuits. With the wide application of SOC (system on chip), the noise of digital switches, radio frequency modules, etc. will be coupled to the reference voltage source, making the traditional bandgap reference voltage source more and more urgent for high power supply rejection ratio. Background technique [0002] For analog circuits such as digital-to-analog converters, analog-to-digital converters, voltage converters, and voltage detection circuits, the reference voltage source is a very important module. The stability of the reference voltage source is directly related to the working status and performance of the circuit. . In order to meet the normal operation requirements of the circuit in different external environments, the reference voltage source sho...

AI Technical Summary

Problems solved by technology

However, due to the further reduction in size and further reduction in power supply voltage, cascode (cascade) and other structures cannot be used, making it difficult for traditional bandgap reference voltage sources to have a higher power supply rejection ratio, and for high-precision analog The circuit supply voltage rejection ratio is again critical

Images