Automatic system for adjusting the output impedance of fast...

Details Automatic system for adjusting the output impedance of fast... Automatic system for adjusting the output impedance of fast...

H - Electricity

04

L

340/73

H04L 1/00 (2006.01) H03K 19/00 (2006.01) H03K 19/0185 (2006.01) H04L 25/12 (2006.01)

Patent

CA 2022029

Abstract An automatic system for adjusting the output impedance of fast CMOS drivers which measures and corrects impedance mismatch between a dedicated reference driver and a dedicated reference transmission line and which correspondingly adjusts the output impedance of a number of slave drivers. The output impedance of the reference driver is measured by feeding a clock signal to the input of the reference driver and then by measuring the voltage at the input of the reference transmission line at the centre of the positive half of the clock signal. The measured voltage is compared with a reference level and, accordingly, a voltage pulse is supplied to charge or discharge a capacitor whose terminal voltage controls of the driver output impedances. The reference transmission line is terminated by a resistance equal to its characteristic impedance.

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