Circuitry and method for duty measurement

Details Circuitry and method for duty measurement Circuitry and method for duty measurement

G - Physics

01

R

G01R 29/027 (2006.01) G01R 29/02 (2006.01) H04L 7/033 (2006.01)

Patent

CA 2271554

Duty measuring circuitry of the present invention includes a pulse detecting circuit for detecting at least one of a convex pulse width and a concave pulse width included in an input data signal. A duty decision circuit determines whether or not the convex pulse width or the concave pulse width detected is smaller than a preselected value. If the detected pulse width is smaller than the preselected, the duty decision circuit determines that the pulse width is valid, and feeds it to an averaging circuit. The circuitry obviates the need for an exclusive fixed pattern, a.g., ONEs and ZEROS alternating with each other customarily used for the measurement of a duty. In addition, the circuitry is capable of accurately measuring a duty even with a random pattern based on RZ (Return-to-Zero) code or NRZ (Non-Return-to-Zero) code.

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