Programmable/tunable active RC filter

Details Programmable/tunable active RC filter Programmable/tunable active RC filter

2007-03-20

2007-03-20

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

C327S552000, C330S305000

Reexamination Certificate

active

10923892

ABSTRACT:
A programmable/tunable active low-pass filter at least has the resistors, capacitors and shunt control devices. It uses the linear property of the MOSFET to implement the shunt control devices. Based on the first-ordered linear analysis of the transfer function of the active-RC filter, it is found that the cut-off frequency of the active-RC filter can be tuned via the effective small-signal current controlled by the shunt control devices. Therefore, the filter of the present invention allowed users for fine tune the cut-off frequency linearly through the shunt control devices when the variation of the environment or procedure parameters of manufacture (i.e. thermo-effects) cause the cut-off frequency drift, thus, the cut-off frequency can be kept in a constant value. In addition, it needs the different cut-off frequency from the different application. The present invention also provides a device for programming the cut-off frequency to a desired frequency value dependent upon the conditions of application within a big range. Thus, the same filter circuit can be used in many purposes widely.

REFERENCES:
patent: 3983504 (1976-09-01), Moy
patent: 6141425 (2000-10-01), Murayama et al.
patent: 6492876 (2002-12-01), Kamal et al.
patent: 6650177 (2003-11-01), Tan
patent: 6714066 (2004-03-01), Gorecki et al.
patent: 6915121 (2005-07-01), Python et al.

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