CONTROLLED TWO-STAGE DIFFERENTIAL AMPLIFIER WITH INPHASE NEGATIVE FEEDBACK Russian patent published in 2010 - IPC H03G3/30 H03F3/45 

FIELD: physics, radio.

SUBSTANCE: proposed invention relates to radio engineering and communication and can be used in automatic gain devices, phase detectors and modulators, in phase-locked loop and frequency multiplication systems or as an amplifier whose voltage transfer ratio depends on the control signal level. The controlled amplifier is the basic block of modern systems for receiving and processing high-frequency and microwave signals, and analogue computer and measurement equipment. The differential amplifier (DA) has an input parallel-balance cascade (1) with a controlled current source (CCS) (2) in a common emitter circuit (3), first (4) and second (5) current outputs of which are connected to first (6) and second (7) load two-terminal circuits and corresponding first (8) and second (9) inputs of the output differential stage (DS) (10), where the output (11) for the inphase signal of the DS (10) is connected to the control input (12) of the CCS (2) in the common emitter circuit (3). The circuit includes a control voltage-top-current converter (13) having first (14) and second (15) inphase outputs connected to corresponding first (4) and second (5) current outputs of the input parallel-balance cascade (1).

EFFECT: lower supply voltage while retaining the electronic control function.

7 cl, 17 dwg