Differential interpolating switched capacitor filter and method

Details Differential interpolating switched capacitor filter and method Differential interpolating switched capacitor filter and method

1996-01-24

1997-10-21

Cunningham, Terry

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

327558, 327552, 330 9, 330109, 333173, H03K 500, H03F 114

Patent

active

056800720

ABSTRACT:
A differential, interpolating, switched capacitor filter and method of operation in which non-interpolating stages of the filter are clocked at a first frequency and a subsequent interpolating stage of the filter is operated at double the first frequency to achieve improved smoothing of the output wave form. The switched capacitors in the interpolating stage which feed forward a differential input from a prior stage to an input to the interpolating stage, and which feed a differential output from the interpolating stage back to an input thereto are paired and switches are provided for the added capacitors so that all of these capacitors are switched. Capacitors which are directly coupled to feed forward a differential input from a prior stage to the interpolating stage are also paired, but only the added capacitor is switched. Other directly coupled capacitors which feed back from the output of the interpolating stage to the input of prior stages are not paired, but are switched to prevent unwanted feedback of the interpolated output to the prior, non-interpolating, stages.

REFERENCES:
patent: 4331894 (1982-05-01), Gregorian et al.
patent: 4430629 (1984-02-01), Betzi et al.
patent: 4599573 (1986-07-01), Senderowicz
patent: 5088490 (1992-02-01), Pagliolo et al.
patent: 5327092 (1994-07-01), Inogai et al.
patent: 5495200 (1996-02-01), Kwan et al.

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