Circuit for generating a frequency-modulated signal indicative o

Details Circuit for generating a frequency-modulated signal indicative o Circuit for generating a frequency-modulated signal indicative o

1988-02-08

1990-01-30

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Modulating or demodulating

Frequency

360 68, G11B 2706, G11B 502

Patent

active

048977381

ABSTRACT:
A circuit for generating frequency-modulated signals for data to be recorded on magnetic tape has a converter to produce a control current I.sub.c for a capacitor C. A detection logic circuit senses voltage V.sub.c across the capacitor C and generates an appropriate frequency f which is fed to a charge pump, for discharging of capacitor C by a predetermined amount at a rate dependent on the frequency f. Control current I.sub.c then charges capacitor C again and the cycle is repeated. A starter circuit is also provided to ensure that the circuit oscillates on each cycle.

REFERENCES:
patent: 3702382 (1972-11-01), Breikss
patent: 3900890 (1975-08-01), Eibner

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