MULTI-DIFFERENTIAL OPERATIONAL AMPLIFIER Russian patent published in 2014 - IPC H03F3/45 

FIELD: radio engineering, communication.

SUBSTANCE: first (5) and second (8) output transistors used in a multi-differential operational amplifier are a first and a second junction field-effect transistor whose gates correspond to the base, the drains correspond to collectors and the sources correspond to emitters of the corresponding first (5) and second (8) output transistors. The collector of the first (1) input transistor is connected to a second (10) power supply bus, the drain of the second (8) output field-effect transistor is connected to a first power supply bus (7), the output of a second (9) current mirror is connected to the output of the device (11), the gate of the first (5) output field-effect transistor is connected to the second (12) non-inverting input of the device, and the gate of the second (8) output field-effect transistor is connected to the second (13) inverting input of the device.

EFFECT: high input impedance for differential and in-phase signals at two of the four inputs of the operational amplifier.

5 cl, 7 dwg