H - Electricity – 04 – N
Patent
H - Electricity
04
N
328/170, 350/90
H04N 5/44 (2006.01) G01R 19/04 (2006.01) H03G 3/20 (2006.01) H04N 5/53 (2006.01)
Patent
CA 1129085
RCA 71,608A Abstract A peak detector circuit is provided for detecting the maximum excursions of an amplitude varying signal. The circuit includes a network comprising a capacitor serially coupled to a charging impedance and having a time constant suitable for responding to the maximum excursions of the amplitude varying signal. A semiconductor means has an input terminal for receiving the amplitude varying signal and an output terminal coupled to the charging impedance for charging the capacitor toward the maximum excursions of the amplitude varying signal. The semiconductor means exhibits an impedance which is subject to increase with a decrease in current drawn therethrough. A controllable current sink is responsive to the amplitude varying signal at the input terminal of the semiconductor means and is coupled to the output terminal of the semiconductor means for drawing a component of current through the semiconductor means during the charging of the capacitor which is supplemental to the capacitor charging current drawn therethrough. The supplemental current component is of a sufficient magnitude to preclude increase of the impedance exhibited by the semiconductor means during the charging of the capacitor beyond a value which is substantially less than the charging impedance.
333313
Morneau Roland L.
Rca Corporation
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