Linearization of voltage-controlled amplifier using MOSFET gain

Amplifiers – With semiconductor amplifying device – Including gain control means

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330284, H03G 330

Patent

active

058085165

ABSTRACT:
A linearized voltage controlled amplifier (VCA) circuit uses the resistance of a gain control MOSFET to control amplifier gain in accordance with a DC gain control voltage. A gain control voltage is applied to the gain control MOSFET's gate through a gate input resistor that forms a voltage divider with a feedback resistor from the output of the amplifier. Since the VCA's output terminal is a low impedance node, the voltage divider network applies most of the gain control voltage to the gate of the gain control MOSFET. Conversely, a small fraction of the amplifier output signal is coupled to the gain control MOSFET's gate, to reduce distortion. The linearized VCA circuit is augmented by a gate drive correction circuit, through which the gain control voltage is coupled to the VCA's gain control MOSFET. The gate drive correction circuit is comprised of a difference amplifier and a compensating MOSFET that is matched with the gain control MOSFET of the VCA circuit for controlling its gate drive voltage.

REFERENCES:
patent: 3581223 (1971-05-01), Armstrong
patent: 3631262 (1971-12-01), Jarrett
patent: 4178482 (1979-12-01), Ovellette
Graeme, Jerald, "Feedback Lowers Age Distortion", EDN, Jan. 7, 1981, p. 202 .

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