Television – Image signal processing circuitry specific to television – Amplifiers
Patent
1997-02-25
1998-02-24
Kostak, Victor R.
Television
Image signal processing circuitry specific to television
Amplifiers
348705, H04N 514
Patent
active
057215944
ABSTRACT:
A differential transconductance amplifier having a fixed value of differential transconductance provides a video output signal current directly proportional to the transconductance of the amplifier and to a difference between first and second differential video input signals supplies thereto. A pair of buffer amplifiers couples the video input signals to respective inputs of the differential transconductance amplifier via respective diode switches which provides Vber protection for the buffer transistors and provides bus isolation under power down conditions. An output circuit regulates the output voltage of the differential transconductance amplifier at a substantially fixed voltage and converts the output signal current to an output signal voltage. Advantageously, the receiver provides very accurate signal gain control unconditional stability, a wide common mode input voltage range, avoids the need for stand-by power and will not load the input bus under power-down conditions.
REFERENCES:
patent: 4575759 (1986-03-01), Griepentrog et al.
patent: 4581645 (1986-04-01), Beyers, Jr.
patent: 4647973 (1987-03-01), Diess
patent: 5305109 (1994-04-01), Harford
patent: 5448311 (1995-09-01), White et al.
patent: 5473390 (1995-12-01), Gurley et al.
Gurley Thomas David
White Charles Michael
Emanuel Peter M.
Kostak Victor R.
Shoneman David T.
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
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