Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Patent
1994-02-15
1996-06-04
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
327552, 327554, 333173, 330109, H03K 522, H03K 1900
Patent
active
055237193
ABSTRACT:
A digitally driven, analog bandpass filter has an analog summer and two analog delay elements connected in a loop. An input signal to the filter is applied to a plus input terminal of the summer, and the output of the second delay elements is applied to a minus input terminal of the summer. The output of filter may be taken either from the output of the summer, or from the output of the second delay element, or from any point in between. Each delay element is driven by a two phase non-overlapping clock, and each element passes a charge from a first capacitor through an op amp to either a second capacitor (first phase) or a third capacitor (second phase). Amplification may be provided by adjusting the ratio of the second (or third) capacitor to the first capacitor. If a differential op amp is used, both sides of the op amp are clocked together, and each side has its own trio of capacitors identical to the trio on the other side. The passband is centered precisely on one-quarter of the clock frequency, and does not vary with manufacturing variances in the components of the filter.
REFERENCES:
patent: 4317092 (1982-02-01), Potter
patent: 4551683 (1985-11-01), Matsuo et al.
patent: 4760346 (1988-07-01), Kultgen et al.
patent: 4988900 (1991-01-01), Fensch
patent: 5181032 (1993-01-01), Ribner
EDN, Jun. 23, 1982, pp. 183-191, Tim Regan, "Switched-Capacitor ICS Improve Filter Specs, Ease Design".
Halim Raouf
Horng Bor-Rong
Longo Lorenzo L.
Callahan Timothy P.
Le Dinh T.
Montanye George A.
Rockwell International Corporation
Silberberg Charles T.
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