Transmitter having PLL circuit

Details Transmitter having PLL circuit Transmitter having PLL circuit

1989-01-19

1990-06-05

Orsino, Joseph A.

Telecommunications

Transmitter

Angle modulation

455117, 455119, 455115, 331 10, 331 16, 331175, 332127, 332128, H04B 104, H01Q 1112

Patent

active

049320734

ABSTRACT:
A transmitter includes a phase-locked loop (PLL) circuit whose output is frequency modulated with a modulation signal. The modulated signal is amplified by an amplifier which is turned on only during a signal transmission of the transmitter. At a time when the amplifier is turned, the output frequency of PLL circuit fluctuates. To depress this frequency fluctuation, the transmitter includes a frequency fluctuation depressing (FFD) circuit. Upon the turning-on of the amplifier, FFD circuit applies a voltage change to the modulation signal so that the frequency fluctuation is depressed.

REFERENCES:
patent: 4379270 (1983-04-01), Carter
patent: 4564821 (1986-01-01), Reichart
patent: 4573026 (1986-02-01), Curtis
patent: 4731870 (1988-03-01), Black

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