Preamplifier circuit

Details Preamplifier circuit Preamplifier circuit

1981-07-29

1982-11-02

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of equalizing

360 67, G11B 545, G11B 502

Patent

active

043576370

ABSTRACT:
A preamplifier for a magnetic record reproducing system includes a differential amplifier construction wherein the input stage may be configured as a differential cascode arrangement for minimum noise at the lower frequency range or to be configured as an emitter-follower for maximum input impedance at the upper frequency range. The structure allows the amplifier to respond to very high frequencies, on the order of 4 MHz, without the introduction of an undesirable phase shift in the reproduced signal.

REFERENCES:
patent: 3465321 (1969-09-01), Reisfeld
patent: 4110798 (1978-08-01), Miller et al.
patent: 4159489 (1979-06-01), Braitberg
patent: 4314288 (1982-02-01), Gyi

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