Pulse or digital communications – Transmitters – Keying circuits
Patent
1995-05-15
1997-04-15
Bocure, Tesfaldet
Pulse or digital communications
Transmitters
Keying circuits
375229, H04L 2704
Patent
active
056217633
ABSTRACT:
An apparatus and method generates a shaped transition between the minimum and maximum output power levels of a transmitter (500). When the transmitter is turned on a stepped transition (415) is generated at the beginning (3) of the transition region (409) followed by a shaped transition (417) to the end (6) of the transition region (409). When the transmitter (500) is turned off a shaped transition region (417') is generated at the beginning (162) of the transition region (411) followed by a stepped transition (415') at the end (3) of the transition region (411). The stepped transition (415 or 415') is generated by adjusting a voltage controlled attenuator (545) and the bias of a power amplifier (545) in the transmitter (500). The shaped transition (417 or 417') is generated by processing transmitted information through finite impulse response filters (507 or 509) before or after the time slot permitted for transmitting information.
REFERENCES:
patent: 2089781 (1937-08-01), Buschbeck
patent: 4485478 (1984-11-01), Takada
patent: 4706243 (1987-11-01), Noguchi
"Technical Terms" 2nd edition, Daniel Lapedes p. 1322, 1978.
Cahill Stephen V.
Diehl John W.
Greene Robert I.
Walczak Thomas J.
Bocure Tesfaldet
Kaschke Kevin D.
Motorola
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