Systems and methods for automatic deviation setting and control

Details Systems and methods for automatic deviation setting and control Systems and methods for automatic deviation setting and control

1997-07-31

1999-11-09

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at separate stations

Frequency or phase modulation

455113, 332128, H04B 100, H03C 306

Patent

active

059830778

ABSTRACT:
A frequency modulation (FM) radio transmitter, such as a cellular telephone, includes an automatic deviation control system to automatically compensate for varying sensitivity of the FM transmitter. The FM transmitter includes a phase lock loop including a controlled oscillator that produces a frequency modulated input signal on an output channel frequency in response to a control input that is applied thereto. A scaler is responsive to the input signal and to at least one scaling content, to scale the input signal based upon the at least one scaling constant and to provide the scaled input signal to the phase lock loop to produce the frequency modulated input signal on the channel frequency. An automatic deviation control system measures the control signal that is applied to the controlled oscillator when tuned to one of the plurality of output channel frequencies and updates at least one of the scaling constants based upon the measured control input, to thereby provide automatic deviation control.

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