DIFFERENTIAL AMPLIFIER WITH CONTROLLED AMPLIFICATION FACTOR Russian patent published in 2010 - IPC H03F3/45 H03G3/30 

FIELD: radio engineering.

SUBSTANCE: differential amplifier (DA) includes first (1) and second (2) input transistors (T) with combined emitters the bases of which are connected to first (3) DA input, third (4) and fourth (5) input T the emitters of which are connected to emitters of T (1) and T (2) and to output (5) of controlled current source (CCS) (6), and bases are connected to second (7) DA input, and load circuit (8) connected to collectors of T (1) and T (5). To the scheme there introduced is additional bipole I₁₁ connected to input (12) of additional current amplifier (CA) (13) and collectors of T (2) and T (4); at that, output (14) of CA (13) is connected to input (15) of CCS (6), and the main output (16) of additional voltage-to-current converter (17) is connected to input (12) OF CA (13).

EFFECT: decreasing supply voltage to 1,5 V and increasing linearity of control characteristic.

2 cl, 14 dwg