Band-gap reference voltage source with high power rejection ratio

The invention discloses a band-gap reference voltage source with the high power rejection ratio. The band-gap reference voltage source comprises a voltage self-adjustment circuit, a starting circuit, a first-order temperature compensation reference voltage generating circuit, an error amplifier, a bias voltage generating circuit and a reference starting circuit. According to the band-gap reference voltage source, power noise is inhibited to a certain degree through the voltage self-adjustment circuit, then power is supplied to a back-stage band-gap reference circuit, the noise is further inhibited through the band-gap reference circuit, and therefore the whole power source has the quite high power rejection ratio. In addition, the voltage self-adjustment circuit further comprises a feedback loop, an output current can be automatically adjusted, and the problem that as the current required by the back-stage circuit is increased suddenly, the whole circuit is unstable is solved; meanwhile, the power rejection ratio of the band-gap reference voltage source can be increased; compared with a traditional band-gap reference voltage source, stability is better, the power rejection ratio is higher, and the band-gap reference voltage source can meet high-accuracy working requirements.