Television – Image signal processing circuitry specific to television – Transition or edge sharpeners
Patent
1996-01-11
1997-08-12
Peng, John K.
Television
Image signal processing circuitry specific to television
Transition or edge sharpeners
348623, 327315, 327319, 327327, 382273, H04N 5208
Patent
active
056570970
ABSTRACT:
A coring circuit for an input signal in the form of a differential input current having two components in phase opposition. A first pair of cascode transistors biased by a first reference voltage applies a first fraction of each of the components of the differential current to respectively first and second resistors. A second pair of cascode transistors biased by the first reference voltage provides a second fraction of each of the components of the differential current to a differential current output of the coring circuit and respectively to first and second branches of a differential stage that also receives voltages across the first and second resistors. Two coring current sources respectively connect first and second outputs of the differential stage to a supply voltage and are connected to each other through a third resistor.
REFERENCES:
patent: 4080627 (1978-03-01), Wheeler
patent: 4263616 (1981-04-01), Lee
patent: 4438454 (1984-03-01), Shanley, II
patent: 4441121 (1984-04-01), Harwood et al.
patent: 4536796 (1985-08-01), Harlan
patent: 4839725 (1989-06-01), Ueda
patent: 4857779 (1989-08-01), Harlos et al.
French Search Report from French Patent Application 95 00602, filed Jan. 13, 1995.
Elbert Mark C.
Schultz Mark A.
Morris James H.
Murrrell Jeffrey S.
Peng John K.
SGS-Thomson Microelectronics S.A.
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