Filter circuit

Details Filter circuit Filter circuit

2007-07-03

2007-07-03

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

C327S344000, C327S558000

Reexamination Certificate

active

11098256

ABSTRACT:
An R-2R resistor circuit network12used in a filter circuit according to the present invention has a path through which each branch current flows to a next integrating capacitor and a path through which each branch current flows to a low impedance analog midpoint (ground potential) Vss. The path can be selected by digital control bit data Bn to B0for each branch current. By this, a frequency characteristic of a filter using an integrator as a component may be changed with an accuracy of (½n+1)(Gm1)/Cf from (½n+1)(Gm1)/Cf to ((2n+1−½n+1)(Gm1)Cf. As a result, by setting the setting bit width to 7 (n=6), a variable range of the frequency characteristic of over one hundredfold may be easily realized.

REFERENCES:
patent: 5028893 (1991-07-01), Marrah et al.
patent: 5523712 (1996-06-01), Miyabe et al.
patent: 5793243 (1998-08-01), Farrow
patent: 6806765 (2004-10-01), Giuroiu
patent: 2001/0033196 (2001-10-01), Lennous et al.
S. Pavan, et al., “High Frequency Continuous Time Filters in Digital CMOS”, #5 “GM-OTA-C Filters”, ISBN 0792377737 (Springer, 2000).

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