Termination circuit for RGB lines

Details Termination circuit for RGB lines Termination circuit for RGB lines

1996-03-04

1996-10-15

Brier, Jeffery

Computer graphics processing and selective visual display system

Display driving control circuitry

Display power source

333 32, G09G 512, H03H 740

Patent

active

055658962

ABSTRACT:
A termination circuit for RGB signal lines provides a high frequency termination impedance that matches the impedance of a monitor cable and monitor termination, without adversely affecting the monitor-sense circuitry of an ASIC that generates the RGB video signals. When used with a VGA ASIC designed to work with 150 .OMEGA. pull-down sense resistors on the RGB lines, the circuit provides the proper 75 .OMEGA. AC termination impedance required for VGA lines while producing the 150 .OMEGA. DC termination required for proper monitor sense operation.

REFERENCES:
patent: 3456206 (1969-07-01), Kwartiroff et al.
patent: 4612576 (1986-09-01), Hinn
patent: 4908842 (1990-03-01), Collins
patent: 5208562 (1993-05-01), Schirm, IV
patent: 5285197 (1994-02-01), Schmidt et al.

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