Modulators – Frequency shift keying modulator or minimum shift keying... – Including logic element
Patent
1997-12-02
1999-07-20
Grimm, Siegfried H.
Modulators
Frequency shift keying modulator or minimum shift keying...
Including logic element
332102, 332135, H03C 302
Patent
active
059260726
ABSTRACT:
A frequency modulation circuit includes an emitter-follower connection transistor (2), having a base supplied with a modulation signal, for generating an emitter voltage which is in proportion to a modulation signal level; and an integrated mono-stable multi-vibrator (1) having an inversion trigger terminal ((A*)), a non-inversion trigger terminal (B), a resister/capacitor terminal (R.sub.X /C.sub.X), a capacitor terminal (C.sub.X), complementary output terminals (Q, (Q*)), and the like. The inversion trigger terminal ((A*)) is connected to the complementary output terminal (Q), the non-inversion trigger terminal (B) is connected to a partial voltage point of partial voltage resistors (10, 11), the capacitor/resistor terminal (R.sub.X /C.sub.X) is connected to the emitter of the transistor (2) through a resistor (3) and connected to the capacitor terminal (C.sub.X) through a capacitor (4), a load (13) is connected to the complementary output terminal ((Q*)), and the emitter of the transistor is driven by a second power supply (15) which generates a voltage higher than a voltage from a first power supply (14) applied to the mono-state multivibrator.
REFERENCES:
patent: 3732506 (1973-05-01), Dupuy
Alps Electric Co. ,Ltd.
Grimm Siegfried H.
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