LOCAL OSCILLATING FREQUENCY REGULATING VOLTAGE CONTROL METHOD OF DIGITAL MOBILE PHONE

摘要

PURPOSE: A local oscillating frequency adjusting voltage control method is provided to regularly keep the initial synchronous gain time in the frequency automatic regulation circuit of a digital mobile terminal. CONSTITUTION: The control method has the steps of: measuring the surrounding temperature of the terminal through a temperature sensor if power is fed on the terminal; feeding the local oscillating frequency adjusting voltage corresponding to the surrounding temperature with a temperature compensating voltage control oscillator to compensate the frequency error of the temperature compensating voltage control oscillator based on the surrounding temperature if the measured temperature is out of the previously set up standard temperature.