Differential amplifier circuit having controllable gain

Details Differential amplifier circuit having controllable gain Differential amplifier circuit having controllable gain

1985-06-06

1986-11-04

LaRoche, Eugene R.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330261, 330278, H03G 330, H03F 345

Patent

active

046212388

ABSTRACT:
A differential amplifier circuit includes a first differential amplifier stage formed of a pair of transistors having inputs and output circuits, the inputs of the transistor pair of the first differential amplifier stage forming an input of the amplifier circuit, load resistors having circuits connected to the output circuits of the pair of transistors of the first differential amplifier stage, a circuit output connected to the load resistors, at least two further differential amplifier stages having first and second circuits, a reference input connected to the first circuit of the further differential amplifier stages, a gain control input connected to the second circuit of the further differential amplifier stages, at least the first circuit of the further differential amplifier stages being connected to the output circuits of the pair of transistors of the first differential amplifier stage, the second circuit of the further differential amplifier stages driving the load resistor circuits, and a control stage connected to the load resistor circuits for maintaining a constant d-c voltage level in the circuit output.

REFERENCES:
patent: 4286226 (1981-08-01), Leidich
patent: 4360786 (1982-11-01), Rehfeldt
patent: 4514702 (1985-04-01), Zogg

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