Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1987-09-04
1989-05-09
Wan, Gene
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330257, H03F 345
Patent
active
048292672
ABSTRACT:
A method and apparatus for automatically restoring the DC signal level of recorded servo information which has been electronically recovered from a rotating disk storage device has a high gain differential amplifier which is connected to sense the DC level of the signal relative to a reference potential, and generate an error current. The resultant current is integrated to generate a potential and corresponding current, which is then applied via a feedback loop to adjust the DC level of the input signal. DC restoration is performed without altering the bias conditions of the preceeding amplifier stages, and is not dependent on waveform symmetry.
Digital Equipment Corporation
Wan Gene
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