Transmitter including an FSK modulator having a switched capacit

Details Transmitter including an FSK modulator having a switched capacit Transmitter including an FSK modulator having a switched capacit

1990-12-05

1992-08-04

Grimm, Siegfried H.

Modulators

Frequency shift keying modulator or minimum shift keying...

Including discrete semiconductor device

307261, 307265, 328 31, 328111, 331 75, 331179, 375 65, 359181, H03K 501, H04L 2712

Patent

active

051362643

ABSTRACT:
A transmitter including a continuous phase FSK modulator is disclosed for use primarily in optical transmission. The output frequencies are achieved by switching a capacitor into and out of an oscillator circuit by means of a PIN diode switch network which is responsive to a binary data input. The resulting sinusoidal waveforms are squared up by means of an inverte with feedback control for adjusting the duty cycle.

REFERENCES:
patent: 4174534 (1979-11-01), Kotlarewsky
patent: 4449247 (1984-05-01), Waschka, Jr.
patent: 4573025 (1986-02-01), McKinzie, III
patent: 4603301 (1986-07-01), Dukes et al.
patent: 4694262 (1987-09-01), Inoue et al.
patent: 4716383 (1987-12-01), Lofgren et al.
patent: 4918296 (1990-04-01), Fujisaka et al.
patent: 4959557 (1990-09-01), Miller
patent: 4959827 (1990-09-01), Grotzinger et al.

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