Logarithmic amplifier

Details Logarithmic amplifier Logarithmic amplifier

1977-06-13

1980-06-24

Miller, Jr., Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307230, 307237, 328145, H03K 508, G06G 712

Patent

active

042097142

ABSTRACT:
A logarithmic amplifier comprising a common-emitter type transistor amplifier circuit with an emitter resistor and a collector load. A bias voltage is applied to the base of the transistor through a diode so that the overall input-output transfer characteristic of the amplifier exhibits a logarithmic characteristic for a relatively wide range of input signals. A cascade connection of several of the basic amplifier circuits enlarges the dynamic range over which a logarithmic transfer characteristic is achieved.

REFERENCES:
patent: 3373294 (1968-03-01), Fujinami
patent: 3374361 (1968-03-01), Callis
patent: 3388266 (1968-06-01), Kjar
patent: 3614644 (1971-10-01), Lieberman
IBM Tech. Disc. Bull., Videologarithmic Amplifier, F. L. O'Malley, vol. 13, No. 9, 2/71, p. 2610.

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