Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Patent
1997-08-06
1999-08-24
Le, Dinh T.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
327552, 327308, 327558, H03K 500
Patent
active
059429356
ABSTRACT:
A filter device suitable for being integrated into a single IC chip comprises a reference signal generator, a first filter circuit, a second filter circuit, a phase-comparator circuit, and a low-pass filter. The reference signal generator is for generating a reference signal. The first filter circuit is connected between an input terminal and an output terminal of the filter device and has a first variable time constant circuit. The second filter circuit has a second variable time constant circuit similar to the first variable time constant circuit and is provided with the reference signal from the reference signal generator. The phase-comparator circuit is for comparing the phase of the reference signal with the phase of an output signal of the second filter circuit to generate an output signal based on the result of this comparison. The low-pass filter is for averaging the output signal of the phase comparator circuit and providing the averaged output signal to both the first and second variable time constant circuits of the first and second filter circuits as a control signal to adjust the time constants of the first and second variable time constant circuits.
REFERENCES:
patent: 5023491 (1991-06-01), Koyama
patent: 5300838 (1994-04-01), Elizondo
patent: 5341249 (1994-08-01), Abbott et al.
patent: 5625317 (1997-04-01), Deveirman
Le Dinh T.
Maioli Jay H.
Sony Corporation
LandOfFree
Filter circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Filter circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Filter circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-470195