DIFFERENTIAL AMPLIFIER Russian patent published in 2009 - IPC H03F3/45 

FIELD: physics; radio.

SUBSTANCE: invention relates to radio engineering and communication and can be used as an analog signal amplifier, in analog microcircuit structures of various purpose (e.g. in operational amplifiers (OA), comparators). Differential amplifier comprises first (1) and second (2) parallel-balance cascades, common-mode inputs (3), (4) and (5), (6) of which are interconnected and connected to respective inputs (7) and (8) of differential amplifier; inverting output (9) of the first parallel-balance cascade (1) is connected to inverting output 10 of the second parallel-balance cascade (2) and is connected to inverting output (11) of the differential amplifier; non-inverting output (12) of the first parallel-balance cascade (1) is connected to non-inverting output (13) of the second parallel-balance cascade (2) and is connected to non-inverting output (14) of the differential amplifier; current-stabilising resistor (15), the first output of which is connected to common emitter input (16) of the first parallel-balance cacscade (1), and the second parallel-balance cacscade (2) has a common emitter input (17). The circuit incorporates supplementary non-inverting current repeater (18), input (19) of which is connected to the second output of current-stabilising impedor (15), and output (20) is connected to common emitter input (17) of the second parallel-balance cascade (2).

EFFECT: increased attenuation factor of input common-mode signals and increased input resistance for common-mode signals.

4 cl, 9 dwg