Ultralow-offset and low-noise current mode reference source circuit

The invention discloses an ultra-low offset and low noise current mode reference source circuit, which comprises a reference current generating circuit and a reference voltage output circuit, the output end of the reference current generating circuit is connected with the input end of the reference voltage output circuit, the reference current generating circuit comprises an error amplifier EA, three PMOS (P-channel Metal Oxide Semiconductor) transistors MP1, MP2 and MP3, and the output end of the error amplifier EA is connected with the input end of the reference voltage output circuit. Four resistors R1, R2, R3 and R4, and three NPN type triodes Q1, Q2 and Q3; and the reference voltage output circuit comprises a PMOS (P-channel Metal Oxide Semiconductor) tube MP4, a resistor R5 and a reference voltage output end VREF. A current mode reference source circuit of a traditional structure can amplify direct-current offset and noise of an error amplifier EA, the precision of output reference voltage is greatly af