An on-chip jitter measurement circuit with sub-picosecond resolution

A circuit for accurate on-chip measurement of timing jitter is demonstrated. Measurements with the circuit show excellent reproduction of corresponding off-chip measurements made with an oscilloscope, and resolution measurements show the jitter resolution of the circuit to be better than 0.4 ps rms. The circuit is very compact, occupying 3200 /spl mu/m/sup 2/ in a 0.13/spl mu/m, 1.2V, CMOS technology, and operates up to 2.5 GHz in this technology.