Voltage and current multiplexing band-gap reference source

The invention provides a voltage and current multiplexing band-gap reference source, which comprises an operational amplifier circuit, which is used for receiving power supply voltage, is connected with a reference voltage generation circuit and is used for providing negative feedback to realize voltage control on the reference voltage generation circuit; the operational amplifier circuit is composed of MOS tubes. The reference voltage generating circuit comprises a reference voltage output circuit and a voltage difference generating circuit which are connected, the voltage difference generating circuit is used for obtaining voltage difference, and the reference voltage output circuit is used for generating and outputting reference voltage; and the reference voltage is multiplexed to the operational amplifier circuit at the same time. And the reference current generating circuit is connected with the reference voltage generating circuit and is used for generating reference current. According to the voltage an