Title:
PASSIVE SWITCHED-CAPACITOR FILTERS
Document Type and Number:
WIPO Patent Application WO/2010/104892
Kind Code:
A3
Abstract:
A passive switched-capacitor (PSC) filter (200) includes (i) an array of capacitors (224, 234, 244) and (ii) an array of switches (232, 242) that can couple the capacitors to a summing node (A). Each switch (232, 242) couples an associated capacitor (224, 234, 244) to the summing node (A) when enabled. Each capacitor (224, 234, 244) stores a voltage value from the summing node (A) when selected for charging and shares electrical charge with other capacitors (224, 234, 244) via the summing node (A) when selected for charge sharing. The PSC filter (200) may include multiple sections (220, 230, 240) for multiple filter taps having one or more capacitors (224, 234a, 234b, 242a, 242b, 242c) of equal size determined based on a corresponding filter coefficient. The capacitors in each section may be sequentially selected for charging or sharing electrical charge.
Inventors:
PAN CHENGZHI (US)
BURKE JOSEPH (US)
FAGG RUSSELL (US)
BURKE JOSEPH (US)
FAGG RUSSELL (US)
Application Number:
PCT/US2010/026725
Publication Date:
November 25, 2010
Filing Date:
March 09, 2010
Export Citation:
Assignee:
QUALCOMM INC (US)
PAN CHENGZHI (US)
BURKE JOSEPH (US)
FAGG RUSSELL (US)
PAN CHENGZHI (US)
BURKE JOSEPH (US)
FAGG RUSSELL (US)
International Classes:
H03H15/02; H03H19/00
Foreign References:
| US6829311B1 | 2004-12-07 | |||
| US20080166986A1 | 2008-07-10 | |||
| JPS6016013A | 1985-01-26 | |||
| US20030035499A1 | 2003-02-20 |
Other References:
JOSHUA KANG ET AL: "A reconfigurable FIR filter embedded in a 9b successive approximation ADC", CUSTOM INTEGRATED CIRCUITS CONFERENCE, 2008. CICC 2008. IEEE, IEEE, PISCATAWAY, NJ, USA, 21 September 2008 (2008-09-21), pages 711 - 714, XP031361558, ISBN: 978-1-4244-2018-6
Attorney, Agent or Firm:
XU, Jiayu (5775 Morehouse DriveSan Diego, CA, US)
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