| US 7,539,721 B2 | ||
| Analog filter with passive components for discrete time signals | ||
| Fabrice Belveze, Fontanil-Cornillon (France); and Luc Garcia, Saint Paul de Varces (France) | ||
| Assigned to STMicroelectronics SA, Montrouge (France) | ||
| Filed on Oct. 06, 2005, as Appl. No. 11/244,773. | ||
| Claims priority of application No. 04 52279 (FR), filed on Oct. 06, 2004. | ||
| Prior Publication US 2006/0071707 A1, Apr. 06, 2006 | ||
| Int. Cl. G06G 7/02 (2006.01) | ||
| U.S. Cl. 708—819 | 24 Claims |
| 1. A filter intended to receive, on an input terminal, a discrete time signal at a sampling clock frequency, comprising at
least one filtering stage comprising a determined number, greater than 2, of filtering units, each filtering unit comprising:
head capacitors in a number equal to the determined number, assembled in parallel between the input terminal and the terminal
of an integration capacitor connected to an output terminal of the filtering stage; and
means for connecting, in successive clock cycles in a number equal to the determined number, successively each head capacitor
to the input terminal, and for then simultaneously connecting the head capacitors to the integration capacitor,
and wherein the successive clock cycles during which the head capacitors of a filtering unit are connected to the input terminal
are offset by one clock cycle from one filtering unit to the next one.
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