Defect tolerant envelope follower

Details Defect tolerant envelope follower Defect tolerant envelope follower

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.

REFERENCES:
patent: 3911776 (1975-10-01), Beigel
patent: 4321488 (1982-03-01), Srivastava
patent: 4346411 (1982-08-01), Buhler et al.
patent: 4356410 (1982-10-01), Miskin
patent: 4648118 (1987-03-01), Hitosumachi
patent: 4866301 (1989-09-01), Smith
patent: 4914398 (1990-04-01), Jove et al.
patent: 5057785 (1991-10-01), Chung et al.
patent: 5101395 (1992-03-01), Cardero et al.
Rackl, W. K., Dynamic Threshold Circuit, "IBM Technical Disclosure Bulletin," vol. 15, No. 4, Sep. 1972.

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