Semi-Parallel Cyclic Type Switched-Capacitor Filter Using Unity Gain Buffer

Toshihiro MORI  Nobuaki TAKAHASHI  Tsuyoshi TAKEBE  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E83-A   No.7   pp.1370-1380
Publication Date: 2000/07/25
Online ISSN: 
Print ISSN: 0916-8508
Type of Manuscript: PAPER
Category: Analog Signal Processing
switched-capacitor,  unity gain buffer,  parallel cyclic type,  semi-parallel cyclic type,  

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Recently, we developed a low power consumption and small total capacitance switched-capacitor filter using a single operational amplifier. It is called a semi-parallel cyclic type (SPCT) filter, in which each capacitance is in proportion to the square root of a transfer function coefficient value. In this paper, we propose the SPCT filter using a single unity gain buffer (UGB). It will be referred to a UGB-SPCT filter. It is possible to use the UGB-SPCT filter over a wider frequency range than the SPCT filter since a UGB has nearly unity gain over a wide frequency range.