Logarithmic amplifier with gain control

Details Logarithmic amplifier with gain control Logarithmic amplifier with gain control

1990-03-19

1991-04-30

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307492, 307493, 328145, G06G 710, G06G 724, G06G 712

Patent

active

050121405

ABSTRACT:
A logarithmic amplifier includes a first diode wherein the anode receives an input signal input signal current and a standing current. The cathode of the first diode is coupled to the emitter of a PNP transistor. The collector of the PNP transistor is coupled to the anode of a second diode. A bias current is added to the emitter and substracted from the collector of the PNP transistor to provide a lower emitter impedance. The cathode of the second diode is coupled to a negative supply voltage through a load resistor. A feedback network including an emitter coupled pair of NPN transistors samples the voltage at the anode of the second diode and sinks a current from the base of the PNP transistor. The voltage at the anode of the first diode is amplified to provide a logarithmic output voltage. The output voltage may be attenuated and applied to the base of the PNP transistor.

REFERENCES:
patent: 3678947 (1972-07-01), Glathe
patent: 3928774 (1975-12-01), Wilson
patent: 4084129 (1978-04-01), Katakura
patent: 4125789 (1978-11-01), Van Schoiack
patent: 4346311 (1982-08-01), Ave et al.
patent: 4418317 (1983-11-01), Bateman
patent: 4471324 (1984-09-01), Welland
patent: 4507615 (1985-03-01), Bateman
patent: 4739283 (1988-04-01), Metz et al.

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