Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1996-06-28
1998-09-15
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including gain control means
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 .
Harris Corporation
Mottola Steven
Wands Charles E.
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