Title:
PASSIVE SWITCHED-CAPACITOR FILTERS CONFORMING TO POWER CONSTRAINT
Document Type and Number:
Japanese Patent JP2015039196
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide passive switched-capacitor (PSC) filters that filter received signals and occupy a small area and consume low power in many applications.SOLUTION: A PSC filter 1000 implements a second-order infinite impulse response (IIR) filter with two complex first-order IIR sections. Each complex first-order IIR section includes three sets of capacitors. A first set of capacitors receives a real input signal and an imaginary delayed signal, stores and shares electrical charges, and provides a real filtered signal. A second set of capacitors receives an imaginary input signal and a real delayed signal, stores and shares electrical charges, and provides an imaginary filtered signal. A third set of capacitors receives the real and imaginary filtered signals, stores and shares electrical charges, and provides the real and imaginary delayed signals.
Inventors:
PAN CHENGZHI
BURKE JOSEPH
BURKE JOSEPH
Application Number:
JP2014194046A
Publication Date:
February 26, 2015
Filing Date:
September 24, 2014
Export Citation:
Assignee:
QUALCOMM INC
International Classes:
H03H19/00; H03H17/04; H03H17/06
Domestic Patent References:
JPS5521697A | 1980-02-15 | |||
JP2006352455A | 2006-12-28 | |||
JP2007324659A | 2007-12-13 | |||
JPH06334481A | 1994-12-02 | |||
JP2006211153A | 2006-08-10 | |||
JP2008011493A | 2008-01-17 | |||
JP2009005088A | 2009-01-08 |
Foreign References:
WO2001022582A1 | 2001-03-29 | |||
WO2002025803A2 | 2002-03-28 | |||
US20030035499A1 | 2003-02-20 | |||
US20050233725A1 | 2005-10-20 | |||
WO2009004818A1 | 2009-01-08 |
Other References:
JPN5012013740; MASKELL D L: 'ANALYSIS OF EVEN ORDER IIR DIGITAL FILTERS IMPLEMENTED AS A CASCADE OF FIRST ORDER 以下備考' Proceedings of the 1988 IEEE International Symposium on Circuits and Systems , 19880607, P531-534
Attorney, Agent or Firm:
Masatoshi Kurata
Toshihiro Fukuhara
Nobuhisa Nogawa
Peak Takashi
Naoki Kono
Sunagawa 克
Iseki Mamoru 3
Tadashi Inoue
Tatsushi Sato
Okada Kishi
Mihoko Horiuchi
Toshihiro Fukuhara
Nobuhisa Nogawa
Peak Takashi
Naoki Kono
Sunagawa 克
Iseki Mamoru 3
Tadashi Inoue
Tatsushi Sato
Okada Kishi
Mihoko Horiuchi
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