ULTRA-LOW WORKING VOLTAGE RAIL TO RAIL OPERATIONAL AMPLIFIER AND DIFFERENTIAL INPUT AMPLIFICATION-STAGE CIRCUIT AND OUTPUT-STAGE CIRCUIT THEREOF

摘要

A differential input amplification-stage circuit (100) includes a voltage unit (10), first and second bulk-driven transistors (20, 30), first and second mirror current sources (40, 50), and a differential amplifier unit (60). The voltage unit (10) includes first to third voltage output ends (11, 12, 13). The first voltage output end (11) is connected to the first and the second bulk-driven transistors (20, 30); the first and the second bulk-driven transistors (20, 30) respectively receive first and second input voltages, and converts the first and the second input voltages into first and second output currents; the differential amplifier unit (60) separately outputs first and second adjustment currents under an action of voltages of the first to the third voltage output ends (11, 12, 13); and the first and the second mirror current sources (40, 50) respectively output first and second predetermined currents (I out+ , I out- ) according to the first output current and the first adjustment current, and the second output current and the second adjustment current, so as to maintain transconductance constancy of the differential input amplification-stage circuit (100). Therefore, output stability is improved. In addition, an output-stage circuit (200) and an ultra-low working voltage rail-to-rail transportation amplified circuit (300) are further provided.