DIFFERENTIAL AMPLIFIER WITH HIGH VOLTAGE AMPLIFICATION FACTOR Russian patent published in 2008 - IPC H03F3/45 

FIELD: electricity.

SUBSTANCE: invention may be used as analogue signal amplifiers in different functional analogue microchips (for example, operational amplifiers, and comparators). Differential amplifier includes input differential stage (1) with reference current source (2) within common emitting circuit, output transistors 1 (3) and 2 (4) with emitters connected to current outputs (5) and (6) of input differential stage (1). Output transistors are linked with power supply bus (9) via current-stabilising impedors 1 (7) and 2 (8), transistor bases (3) and (4) being integrated and connected to offset voltage source (10). Transistor collector (3) is linked with active load (12) input 1 (11) and transistor collector (4) is connected with active load (12) input 2 (13). Circuit is supplemented with additional transistor 1 (14) with base connected to transistor collector (4). Collector is connected to transistor emitter (3), emitter being linked with additional reference current source 1 (15).

EFFECT: increased voltage amplification factor.

4 cl, 10 dwg