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A programmable clock generator that uses noise shaping and its application in switched-capacitor filters

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2 Author(s)
Hurst, P.J. ; Dept. of Electr. & Comput. Eng., California Univ., Davis, CA, USA ; Rothenberg, B.C.

A programmable digital clock generator that produces a wide range of clock frequencies with fine resolution is described. The clock generator consists of a noise-shaping control loop and a number-controlled oscillator. The generated clock has a time-varying period. When this clock is used as the sampling clock in a switched-capacitor filter (SCF) to set its frequency response, the time-varying period causes nonuniform sampling, which is acceptable under certain conditions that are described. Measured performance of a 2-μm CMOS implementation of the clock generator is presented. Also, measured data for the clock generator driving two SCF's are reported

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:30 ,  Issue: 4 )