Electricity: measuring and testing – Magnetic – Displacement
Patent
1997-07-16
1999-09-14
Ballato, Josie
Electricity: measuring and testing
Magnetic
Displacement
32420725, 324166, 327510, G01B 730, G01P 7481, H03K 501
Patent
active
059528249
ABSTRACT:
A magnetic detecting apparatus is capable of performing accurate waveform processing without being affected by noise signals or the like, the level shifting circuit thereof having a fixed voltage shift so as to be free of varying amplitudes of analog signals. Waveform shaping circuitry for turning an analog signal detected from a giant magnetoresistive element into a pulse signal includes: the level shifting circuit for generating an amplified voltage (V1) of analog signals and a voltage (V2) which is higher than the voltage (V1) and a voltage (V3) which is lower than the voltage (V1); a circuit which alternately retains the minimum value of the voltage (V2) and the maximum value of the voltage (V3) as a reference voltage; and a comparator circuit which compares a voltage resulting from adding a hysteresis to the voltage (V1) with the reference voltage and issues a pulse signal. The level shifting circuit is constituted by resistors inserted between the output terminal of the voltage (V1) and the output terminals of the voltages (V2, V3), and constant-current circuits connected in series with the resistors.
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Hatazawa Yasuyoshi
Hiraoka Naoki
Ohashi Yutaka
Shinjo Izuru
Ballato Josie
Mitsubishi Denki & Kabushiki Kaisha
Sundaram T. R.
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