Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Patent
1997-11-17
1999-11-09
Le, Dinh T.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
327 94, 330 9, H03K 500
Patent
active
059822295
ABSTRACT:
A novel signal processing scheme comprises a digital to analog converter which is clocked at a first frequency, and a switched capacitor filter which receives input from the digital to analog converter and is clocked at a second frequency which is a multiple N times the first frequency. A preferred version of the present invention further comprises an analog signal sychronization circuit which allows the switched capacitor filter to oversample output from the digital to analog converter. The analog signal sychronization circuit comprises a sample and hold circuit, which receives input from the digital to analog converter and holds the input so that the switched capacitor filter can sample the same input N times, and a digital clock generator, which clocks the sample and hold circuit such that the sample and hold circuit only samples settled and valid output data from the digital to analog converter. An RC active filter receives input from the switched capacitor filter and rejects signal images at the first and higher frequencies.
REFERENCES:
patent: 5245344 (1993-09-01), Sooch
Liu Edward
Wong See-Hoi Caesar
Le Dinh T.
LSI Logic Corporation
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