Method and apparatus for controlling clock skew

Details Method and apparatus for controlling clock skew Method and apparatus for controlling clock skew

1991-01-23

1993-04-20

Westin, Edward P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307597, 307269, H03K 1900, H03K 513

Patent

active

052045595

ABSTRACT:
A circuit for controlling clock skew has a plurality of delay elements placed in each of the clock output paths in a clock distribution circuit. The delay elements may be selectively switched into or out of each clock output path in order to adjust the delays of each clock output path so that the skew between clock outputs is minimized. The delay in each clock output path is determined by measuring the frequency of a ring oscillator created by connecting a feedback loop across the delay elements. The frequency of oscillation is measured as delay elements are switched into or out of each clock output path until the frequency reaches close to a target frequency.

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patent: 4922141 (1990-05-01), Lofgren et al.
patent: 5041738 (1991-08-01), Walters, Jr.
patent: 5043596 (1991-08-01), Masuda et al.

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