CASCADE DIFFERENTIAL AMPLIFIER Russian patent published in 2008 - IPC H03F3/45 H03F3/34 

FIELD: radio engineering and communications, possible use as device for amplification of analog signals, in structure of analog microchips of various functional purposes (for example, in operational amplifiers with low values of zero shift EMF).

SUBSTANCE: cascade differential amplifier contains input differential cascade (1), transistors (2) and (3) of intermediate cascade, bases of which are connected to shifting voltage supply (4), and emitters are connected to outputs (5) and (6) of differential cascade (1) and through first (7) and second (8) current-stabilizing dipoles are connected to bus of first (9) power supply, where collector of transistor (3) of intermediate cascade is connected to input (10) of buffer amplifier (11) and collector of transistor (12) of intermediate cascade, emitter of which is connected to emitter of transistor (13) of intermediate cascade and to bus of second intermediate cascade (14), and base is connected to base of transistor (13) and collector of transistor (2). An additional transistor (15) is introduced to the circuit, base of which is connected to common bus of first (9) and second (14) current supplies, collector is connected to emitter of transistor (2), and emitter is connected to collector of transistor (13), resulting in reduction of zero shift EMF of cascade differential amplifier due to identical shift of input characteristics of transistors (13) and (12), caused by influence of Early effect.

EFFECT: increased efficiency.

2 cl, 6 dwg