Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Particular stable state circuit
Reexamination Certificate
2005-07-05
2005-07-05
Ton, My-Trang Nu (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Particular stable state circuit
C327S206000
Reexamination Certificate
active
06914466
ABSTRACT:
An input circuit has hysteresis to mitigate the effects of input noise. The input circuit receives an analog input signal and determines whether the unregulated analog input signal is a high or a low voltage. The input circuit outputs a regulated low voltage (i.e., “0”) for a low input signal, and outputs a regulated high voltage (i.e., “1”) for a high input signal. The low-to-high transition occurs at a higher voltage than a high-to-low transition, which mitigates noise on the input signal. Furthermore, the comparator includes a feedback path from an output of the comparator to an input of the comparator. The feedback path causes some delay in any output voltage transition (i.e. high-to-low output transition or low-to-high transition), which further enhances the hysteresis effect and improves noise immunity. An embodiment of the circuit interfaces with high voltage (e.g., 5V) input signals and outputs low voltage (e.g., 1.2V) output signals. In other words, the input circuit also provides a voltage transition while detecting the low-to-high and high-to-low transitions.
REFERENCES:
patent: 4097772 (1978-06-01), Carter
patent: 4256974 (1981-03-01), Padgett et al.
patent: 4719367 (1988-01-01), Denda
patent: 4733107 (1988-03-01), O'Shaughnessy et al.
patent: 5087841 (1992-02-01), Rogers
patent: 5319265 (1994-06-01), Lim
patent: 5463339 (1995-10-01), Riggio, Jr.
patent: 5736869 (1998-04-01), Wei
patent: 6130556 (2000-10-01), Schmitt et al.
patent: 6281731 (2001-08-01), Fifield et al.
patent: 6288575 (2001-09-01), Forbes
patent: 6566926 (2003-05-01), Patterson
patent: 2003/0001644 (2001-06-01), Chao et al.
patent: 0 555 779 (1993-08-01), None
Sedra, A.; Smith, K: “Microelectronic Circuits” 1987, Holt, Rinehart and Winston, Inc., New York, XP002261210, pp. 240-241.
European Search Report from European Appl. No. 03004688.2, 3 pages dated Dec. 9, 2003.
Broadcom Corporation
Nu Ton My-Trang
Sterne Kessler Goldstein & Fox P.L.L.C.
LandOfFree
Input circuit with hysteresis does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Input circuit with hysteresis, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Input circuit with hysteresis will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3382352