FSK modulator using saw resonator with switchable capacitors

Details FSK modulator using saw resonator with switchable capacitors FSK modulator using saw resonator with switchable capacitors

1995-06-01

1996-07-02

Grimm, Siegfried H.

Modulators

Frequency shift keying modulator or minimum shift keying...

Including discrete semiconductor device

331107A, 331179, 375272, 375306, H04L 2712

Patent

active

055326544

ABSTRACT:
An FSK modulator including an amplifier for oscillation has a surface acoustic wave resonator connected in series with a switching circuit formed without a variable-capacity diode but including a semiconductor switch and one or more fixed-capacity capacitors. When an input signal is received, the switch causes a capacitor or combination of capacitors to become connected in series with the surface acoustic wave resonator, providing oscillations with two frequencies to effect FSK modulation.

REFERENCES:
patent: 4684853 (1987-08-01), Coash
patent: 5016260 (1991-05-01), Masuda
patent: 5367537 (1994-11-01), Anderson

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