Rf fsk transmitter

Details Rf fsk transmitter Rf fsk transmitter

1985-07-30

1987-07-21

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 45, 331179, 332 16R, H04L 2712, H03C 300

Patent

active

046823441

ABSTRACT:
An improved transmitter circuit for rf modems usable for communication in local area computer networks is provided. The transmitter circuit includes a digital/analog conversion circuit for generating a frequency modulated carrier from an input data signal, and a switched linear amplifier for amplifying and controlling the frequency modulated analog signal under the direction of the LAN protocol. The conversion circuit includes a time balanced compensated switching circuit for maintaining duty cycle integrity, while the switched linear amplifier provides on/off carrier control and level adjustment with minimum signal distortion including switching transients, and with minimum spurious signal leakage when off.

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patent: 4311971 (1982-01-01), LaRosa
patent: 4354163 (1982-10-01), Kato
patent: 4368439 (1983-01-01), Shibuya et al.

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