Design Methodology of a Capacitor for a Switched Capacitor Filter Accurate to a Capacitance Ratio and Insensitive to a Process Deviation

Katsuhiro FURUKAWA  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E85-A    No.5    pp.1172-1175
Publication Date: 2002/05/01
Online ISSN: 
Print ISSN: 0916-8508
Type of Manuscript: LETTER
Category: Analog Signal Processing
SCF,  capacitor,  sensitivity,  deviation,  leapfrog filter,  

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This letter proposes a design methodology of a capacitor for a switched capacitor filter. The capacitor design method makes the capacitor accurate to the capacitance ratio and insensitive to the process deviation. The SCF designed is used for the PCM CODEC filter and the deviation of the frequency characteristic is below 0.05 dB for a process deviation 0.5 µm in 5 µm CMOS process.