Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Patent
1997-11-24
2000-06-06
Le, Dinh
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
327552, 327554, 327559, 327337, 333172, H03K 500
Patent
active
060723602
ABSTRACT:
A low pass filter includes an input, an output, a storage means, a switching means and a control means. The input receives an input signal. An output signal is generated on the output. The storage means is a sample storage element, for example, a capacitance. A first end of the storage means is connected to the output. The switching means is connected between the first end of the storage means and the input. The switching means, when closed, electrically connects the input to the first end of the storage means. When open, the switching means electrically isolates the input from the first end of the storage means. The control means controls the switching means. The control means generates a switching control signal. The switching control signal has a sampling frequency. The capacitance provided by the capacitance means and a pulse width of the switching control signal are selected so that a maximum cutoff frequency of the low pass filter is less than the sampling frequency divided by two. Other filter configurations are constructed from the low pass filter.
REFERENCES:
patent: 3727120 (1973-04-01), Jewell et al.
patent: 3886316 (1975-05-01), Getgen
patent: 4783635 (1988-11-01), Sevastopoulos
patent: 4801888 (1989-01-01), Haque
patent: 4857778 (1989-08-01), Haque
patent: 5317217 (1994-05-01), Rieger et al.
patent: 5473278 (1995-12-01), Shibata
Le Dinh
Weller Douglas L.
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