Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Patent
1994-04-08
1996-08-20
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
327552, 327551, 327510, 327 94, 327100, H03K 500, H04B 110
Patent
active
055482422
ABSTRACT:
A waveform shaping circuit shapes a waveform by comparing an output signal generated by an electromagnetic coil in response to a change in an incident magnetic flux to a reference voltage in a comparator. The circuit prevents waveform shaping error due to rapid fluctuations in the output signal. The waveform shaping circuit includes a high-pass filter that removes low-frequency components having frequencies not higher than a cut-off frequency from the output signal of the electromagnetic coil and that has at least two different attenuation characteristics with respective cut-off frequencies, a voltage limiting circuit for switching between the attenuation characteristics of the filter in response to the amplitude of the output signal of the electromagnetic coil by limiting the amplitude of the output signal to a maximum voltage, and a comparator for comparing the filtered output signal with a reference voltage and generating a shaped output signal in response.
REFERENCES:
patent: 3832646 (1974-08-01), Szabo et al.
patent: 3857104 (1974-12-01), Sacks
patent: 4320521 (1983-03-01), Balakrishnan et al.
patent: 4459542 (1984-07-01), Terrier et al.
patent: 5144231 (1992-09-01), Tenenbaum et al.
patent: 5285165 (1994-02-01), Renfors et al.
"Method for Generating Shouldering Distortion on a High Frequency Linewave ", IBM Technical Disclosure Bulletin, vol. 30, No. #2, Jul. 1987, pp. 724-775.
Ohashi Yutaka
Yasuda Yukio
Callahan Timothy P.
Le Dinh T.
Mitsubishi Denki & Kabushiki Kaisha
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