MULTI-DIFFERENTIAL OPERATIONAL AMPLIFIER Russian patent published in 2014 - IPC H03F3/00 

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to radio engineering and communication and can be used as a broadband signal amplifier, in analogue interfaces, analogue-to-digital converters, RC filters, instrumentation amplifiers etc. The multi-differential operational amplifier includes an input differential voltage-to-current converter, anti-phase current outputs, two-terminal loads, power supply buses, current outputs of the device, input transistors, an input transistor emitter, power sources, reference current sources, scaling resistors, the reference current sources are in form of controlled reference current sources with corresponding control inputs which are connected to the output of the stage for selecting the output in-phase voltage of the input differential voltage-to-current converter, wherein inputs of the stage for selecting the output in-phase voltage of the input differential voltage-to-current converter are connected to corresponding anti-phase current outputs of the input differential voltage-to-current converter.

EFFECT: high coefficient of attenuation of input in-phase signals of a multi-differential operational amplifier, wider operating frequency range, low temperature drift of the zero offset emf, high input cut-off voltage.

4 cl, 13 dwg