Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1988-10-14
1990-12-25
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307494, 307497, 328145, G06G 724, G06G 712
Patent
active
049805843
ABSTRACT:
A successive detection logarithmic amplifier consists of multiple stages, with each stage containing a field-effect transistor (FET) which functions as both an amplifier and a detector. The FET, having an external gate biasing terminal, is biased to operate in its linear region as an amplifier. The gate-source junction of the FET, which is a diode, functions as the detector. When a signal exceeding a predetermined threshold is applied to the FET, the gate-source junction conducts current in the forward direction during the positive half-cycles of the input signal. During the negative half-cycles of the input signal, very little current flows through the gate-source diode junction. The time average of the forward current peaks produces a voltage across a resistor connected between the external gate bias terminal and ground. The voltages at the external gate bias terminals of each of the stages are summed to form a video output signal, a piece-wise linear voltage which is a logarithmically proportional to the input signal at the initial stage.
REFERENCES:
patent: 3605027 (1971-09-01), Nichols
patent: 3668535 (1972-06-01), Landsdowne
patent: 3745474 (1973-07-01), Hughes
patent: 4053842 (1977-10-01), Turski et al.
patent: 4255714 (1981-03-01), Rosen
patent: 4506678 (1985-03-01), Russell et al.
Radiotron Designer's Handbook, Fourth Edition, pp. 1082-1085, 1953, Edited by F. Langford-Smith (Wireless Press for Amalgamated Wireless Valve Company, Pty. Ltd., 47 York Street, Sydney, Australia) (Reproduced and Distributed by Electron Tube Divison of Radio Corporation of America, Harrison, N.J).
Goff Miles E.
Meharry David E.
Miller Stanley D.
Phan Trong
Sanders Associates Inc.
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