Method and circuit for recording broadband signals on a magnetic

Details Method and circuit for recording broadband signals on a magnetic Method and circuit for recording broadband signals on a magnetic

1987-11-17

1989-08-01

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

G11B 509

Patent

active

048538000

ABSTRACT:
In order to provide a magnetic recording head with a broadband signal with minimum distortion from the reactances of wire connections and the like, a voltage controlled current source is used to feed equivalent circuits representing a magnetic head like the recording head in an output that is taken from that current source at a point that reflects the effect of the equivalent circuit to operate the controlled voltage source for providing the driving current for the recording head. Instead of a parallel coil and resistor combination in series with another resistor, the equivalent circuit can consist of another magnetic head of the same kind as the recording magnetic head but not used for recording. In practice differential or complementary cascode amplifiers are used for the voltage controlled current source at the signal input and differential or complementary final stage amplifiers are used for driving the recording head through a rotary transformer or broadband recording on tape. When the equivalent circuit is another magnetic head not used for recording, it may be convenient to drive it through a transformer, particularly when the controlled current source for which it provides a load is a differential amplifier.

REFERENCES:
patent: 2889541 (1959-06-01), Huss et al.
patent: 4008493 (1973-02-01), Pizzuro
patent: 4245268 (1981-01-01), Toshimitsu
patent: 4296444 (1981-10-01), Sochor
Manz, "Videorecorder-Technik", 1st Ed. 1979, pp. 148-153, Sections 6.8 & 6.9, FIGS. 6-18 thru 6-20.

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