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

作     者：Hurst, Paul J. Rothenberg, Bret C. 

作者机构：Univ of California Davis United States 

出 版 物：《IEICE Transactions on Electronics》 (IEICE Trans Electron)

年 卷 期：1995年第E78-C卷第6期

页      面：651-659页

核心收录：

主　　题：Programmable logic controllers 

摘      要：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.