PUSH-PULL OPERATIONAL AMPLIFIER Russian patent published in 2002 - IPC

FIELD: electronic devices for building integrated circuits. SUBSTANCE: high-gain amplifier has main amplifier unit of two parallel-connected input differential pairs formed by p and n transistors. Each differential pair is loaded into two-tier current reflector of respective polarity of conductivity; lower-tier transistors of each current reflector provide for additional amplification due to different transconductance of amplifier transistors T4 and T12 in static and dynamic modes, respectively. Novelty is introduction of two controlled feeder sources I_n1 and I_n2 for setting mode of reduced power requirement for transistors T4 and T12 in static mode and matched with input control signal by their ac dynamic characteristics with aid of diodes D3 and D4, as well as two accelerating capacitors C_a1 and C_a2 eliminating amplifier stage built around transistors T4 and T12 in vicinity of high frequencies which makes it possible to reduce capacitance of main correcting capacitor C_cor. EFFECT: enhanced gain without narrowing frequency passband, enhanced rate or rise of output signal at reduced power requirement of main amplifier unit. 2 dwg