Improvement of PSRR Characteristics of a SCF Using a Leapfrog Filter and an Equal Level Diagram Design

Katsuhiro FURUKAWA

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E84-A    No.10    pp.2600-2605
Publication Date: 2001/10/01
Online ISSN: 
Print ISSN: 0916-8508
Type of Manuscript: LETTER
Category: Analog Signal Processing
PSRR,  SCF,  leapfrog,  frequency characteristics,  voice-band PCM CODEC,  

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Power supply rejection ratio (PSRR) characteristics of a switched capacitor filter (SCF) is improved when using an equal level diagram design of a leapfrog type filter. By using this design method, it is shown that PSRR of a SCF measured is improved about 20 dB.