Tuneable filters using operational amplifiers

Details Tuneable filters using operational amplifiers Tuneable filters using operational amplifiers

2006-11-27

2008-09-16

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

C327S552000, C327S553000, C327S554000

Reexamination Certificate

active

07425863

ABSTRACT:
A low pass filter includes a switchable resistor bank, a gain stage, and a capacitor bank. The resistors and capacitors switched into the circuit determine a cutoff frequency of the low pass filter. Frequency programmability may be obtained using the switchable resistor bank implemented as a parallel bank of binary weighted resistors. Further frequency programmability may be obtained using the switchable capacitor bank in conjunction with the switchable resistor bank. The resistor and capacitor processes in a semiconductor wafer are sufficiently accurate and repeatable so as to minimize any necessary calibration.

REFERENCES:
patent: 6452443 (2002-09-01), Thompson et al.
patent: 6958644 (2005-10-01), Palaskas et al.
patent: 7180939 (2007-02-01), Palaskas et al.
patent: 2001/0033196 (2001-10-01), Lennous et al.
Application Note 727: Filter Design Using Integrator Blocks, 5 pages, printed Aug. 21, 2006 from http://www.maxim-ic.com/appnotes.cfm/appnote—number/727, dated Jan. 16, 2001.

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