Broadband matching technique for high speed logic and high resol

Details Broadband matching technique for high speed logic and high resol Broadband matching technique for high speed logic and high resol

1996-09-03

1998-07-14

Santamauro, Jon

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Bus or line termination

345211, G09G 512, H03K 1716

Patent

active

057810290

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. The termination circuit includes a first resistor connected in parallel with a diode. The diode is reversed biased when a DC voltage is present on a VGA line. The parallel circuit is connected in series with a second resistor such that at DC the termination circuit has a resistance equal to the sum of the resistances of the two resistors. At high frequencies the termination circuit has a resistance equal to the second resistor. 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.

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