Modulators – Frequency shift keying modulator or minimum shift keying... – Including discrete semiconductor device
Patent
1997-04-10
1998-08-11
Grimm, Siegfried H.
Modulators
Frequency shift keying modulator or minimum shift keying...
Including discrete semiconductor device
331107A, 375272, 375306, H04L 2712, H03B 536
Patent
active
057932611
ABSTRACT:
A digitally-controlled SAW stabilized FSK oscillator circuit having an oscillator and a single-port SAW resonator with a predetermined circuit resonant frequency and being coupled to the oscillator for establishing a first oscillator output frequency, F.sub.SAW. A bipolar transistor has at least one predetermined shunt capacitance value, C, that is placed in electrical series with the single-port SAW resonator when the transistor is in the OFF state and a closed switch that replaces the capacitance when the transistor is in the ON state to cause the first frequency, F.sub.SAW, to be generated by the oscillator when the transistor is ON and to cause a second frequency, F.sub.2, to be generated by the oscillator when the transistor is in the OFF state.
REFERENCES:
patent: 5367537 (1994-11-01), Anderson
patent: 5532654 (1996-07-01), Ieki et al.
Grimm Siegfried H.
RF Monolithics, Inc.
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