H - Electricity – 04 – N
Patent
H - Electricity
04
N
328/166, 330/21,
H04N 5/14 (2006.01) H04B 1/10 (2006.01) H04N 5/21 (2006.01) H04N 5/44 (2006.01)
Patent
CA 1191562
ABSTRACT Adjustable coring circuit includes linear amplifier and multistage limiting amplifier responsive to input signals from a common source. Limiting amplifier includes an input stage receiving operating current from a first current source transistor, in cascade with an output stage receiving operating current from a second current source transistor. Cored signal, corresponding to the difference between a linearly translated version of the input signals and a doubly clipped version thereof, is developed by a signal combiner responsive to outputs of both amplifiers. Base-emitter paths of the two current source transistors are connected in series across a common bias source. The base electrodes of two control transistors, of mutually opposite conductivity types, respond to variations of common coring level control voltage. Collector-emitter path of one control transistor shunts base-emitter path of first current source transistor. Emitter-collector path of other control transistor, which shunts the common bias source, is nonconducting over major portion of variation range of coring level control voltage.
423033
Morneau Roland L.
Rca Corporation
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