A High Power Supply Rejection, Low Process Variation Bandgap Voltage Reference

Abstract

The invention discloses a band-gap reference voltage source with high source restraining and low technology deviation. The band-gap reference voltage source with high power source restraining and low technology deviation comprises a band-gap reference core circuit, a preconditioning circuit, a self adaptive technology adjusting circuit, a first biasing circuit, a second biasing circuit and a starting circuit. When the starting circuit powers on under the power supply voltage, the starting circuit respectively provides starting signals for the first biasing circuit, the second biasing circuit and the band-gap reference core circuit, the output of the first biasing circuit and the output of the second biasing circuit are connected with the self adaptive technology adjusting circuit and the preconditioning circuit respectively, and the preconditioning circuit obtains pre-adjusting signals from the band-gap reference core circuit, and provides pre-adjusting voltage for the first biasing circuit, the self adaptive technology adjusting circuit and the band gap, the second biasing circuit and the band-gap reference core circuit. The self adaptive technology adjusting circuit obtains the technology information from the band-gap foundation core circuit and returns the technology adjusting information to the band-gap foundation core circuit. The band-gap reference core circuit accepts the preconditioning signal and the technology adjusting information, and outputs the band-gap reference voltage Vref finally.

Description

technical field [0001] The invention relates to a bandgap reference voltage source with high power supply suppression (PSR) and low process deviation, which is a bandgap reference voltage source with high PSR, high precision and low temperature drift. It belongs to the field of integrated circuits. Background technique [0002] Voltage reference is an important part of analog and digital-analog hybrid circuits, including digital-analog converters, switching power supplies, linear voltage regulators and other circuits are inseparable from voltage references. At the same time, with the continuous development of integrated circuits, the requirements for the voltage reference are getting higher and higher, and its performance will affect the performance of the entire system. Therefore, it is very necessary to design a reference voltage with good performance. The bandgap reference source is currently the most widely used voltage reference source due to its good temperature perf...

AI Technical Summary

Problems solved by technology

[0003] At present, the power management market is developing rapidly, and the demand for switching power supply chips has risen sharply, and because there is usually very large power supply noise inside the switching power supply, traditional bandgap reference circuits such as figure 1 As shown, the isolation between the power supply and the output reference voltage is not enough, and the output reference voltage is easily affected by the power supply ripple and the change of the process angle. Moreover, the traditional bandgap reference cannot eliminate the output voltage change caused by the process, resulting in insufficient initial voltage output accuracy of the bandgap reference. It is often necessary to trim the resistors before packaging, which greatly increases the cost

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