Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1992-11-06
1994-10-18
Bertsch, Richard A.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307520, 307530, 307494, H03K 1730
Patent
active
053571509
ABSTRACT:
An envelope follower is provided which reduces defect propagation when reading analog information signals from a read head of, for example, an optical drive or a magneto-resistive tape drive. In a preferred embodiment, the envelope follower includes a differential amplifier, to sense the difference between the amplitude of the information signal and an envelope voltage across a capacitor, and a current mirror, responsive to the differential amplifier, to charge the capacitor at a predetermined rate when the amplitude of the information signal exceeds the envelope voltage. When the amplitude of the information signal is below the envelope voltage, the current mirror is deactivated by the differential amplifier and the capacitor is allowed to discharge through a voltage divider. The output of the voltage divider is a threshold voltage which is compared with the information signal by another comparator to generate a digital signal representative of the analog information signal, typically used as a qualifier in a qualified peak detector.
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Rackl, W. K., Dynamic Threshold Circuit, "IBM Technical Disclosure Bulletin," vol. 15, No. 4, Sep. 1972.
Bertsch Richard A.
International Business Machines - Corporation
Kocharov M.
Shifrin D. A.
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