H - Electricity
03
K
H03K 7/06 (2006.01) H03B 5/12 (2006.01) H03K 5/156 (2006.01)
Patent
CA 2054324
- 8 - FSK MODULATOR 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 and switchable current source which is responsive to a binary data input. The resulting sinusoidal waveforms are squared up by means of an inverterwith feedback control for adjusting the duty cycle.
American Telephone And Telegraph Company
Gregg Nardozza
Kirby Eades Gale Baker
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