CONTROLLED AMPLIFIER AND ANALOGUE SIGNAL MIXER BASED ON DARLINGTON DIFFERENTIAL STAGE Russian patent published in 2014 - IPC H03F3/00 

FIELD: radio engineering, communication.

SUBSTANCE: invention can be used in radio receivers, phase detectors and modulators, as well as in frequency multiplier systems or as an amplifier whose voltage transfer ratio from inputs of channel X depends on the control signal strength in channel Y. The method is carried out using a controlled amplifier and an analogue signal mixer based on a Darlington differential stage which comprises first (1) and second (2) anti-phase input voltage sources, bases of a first (3) and a second (4) input transistor, the emitter of the first (3) input transistor, a first (5) current-stabilising two-terminal element, a first (6) power supply, the emitter a second (4) input transistor, a second (7) current-stabilising two-terminal element, a first (6) power supply, a third (8) input transistor, the emitter of a fourth (9) input transistor, a third (10) current-stabilising two-terminal element, a differential load circuit (11), a second (12) power supply, first (13) and second (14) outputs of the device.

EFFECT: improved suppression of the fundamental harmonic owing to analogue signal mixers.

2 cl, 8 dwg