Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Reexamination Certificate
2005-06-21
2005-06-21
Cunningham, Terry D. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
C327S552000, C327S556000, C330S107000, C330S109000
Reexamination Certificate
active
06909321
ABSTRACT:
The present invention provides an active low-pass filter system including a low-pass filter circuit and at least one frequency-rejecting network coupled to the low-pass filter circuit. The frequency-rejecting network is included in a resistive forward signal flow branch of the low-pass filter. The present invention also provides a power amplifier system for driving a load. The power amplifier system includes a pulse width modulation circuit which creates ripple spectra, an error amplifier and modulator circuit, and a demodulation filter connected in series, and a feedback control loop coupled to the pulse modulation circuit and including an active low-pass filter having a feedback demodulation filter and an isolated-integrator frequency-rejecting network.
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“Tunable RC Null Networks”, by Ralph Glasgel, Oct. 1969 issue of EEE, pp. 70-74.
“A Practical Method of Designing RC Active Filters”, by R.P. Sallen and E.L. Key, Reprinted from IRE Trans. Circuit Theory, vol. CT-2, pp. 74-85, Mar. 1955, pp. 51, 53, 55, 57, 59 and 61.
Olsson: “New Null Filter Replaces Twin-T”, Electronics World and Wireless World, vol. 101, No. 1707, Feb. 1995 pp. 119-120, Reed Publishing, Sutton, Surrey, GB.
Serge Ramef: “A Low Distortion Anti-Aliasing Smoothing Filter for Sampled Data Integrated Circuits”, IEEE Journal of Solid-State Circuits, vol. 23, No. 5, Oct. 1988, pp. 1267-1270, Ieee Inc., New York, US.
Cunningham Terry D.
Harman International Industries Incorporated
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