G - Physics – 06 – G
Patent
G - Physics
06
G
330/24
G06G 7/24 (2006.01) G06G 7/12 (2006.01)
Patent
CA 1293304
15312-108 PATENTS ABSTRACT OF THE DISCLOSUREYTY A successive detection logarithmic amplifier consists of multiple stages, with each stage containing a field-effect transistor (FET) which functions a both an amplified 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 voltage 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 logarithmically proportional to the input signal at the initial stage.
614296
Goff Miles Edward
Meharry David Edward
Sanders Associates Inc.
Smart & Biggar
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