Compensation method and device of the voltage-controlled crystal oscillator in mobile unit

A compensation method of the input voltage of voltage-controlled crystal oscillator (VCO) in mobile unit is disclosed. The compensation method comprises the following steps: first, when the mobile unit and base station proceeds signal transmission at different power levels, the voltage difference me...

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Bibliographic Details
Main Author CHEN, LIANG-FANG
Format Patent
LanguageChinese
English
Published 16.01.2005
Subjects
BASIC ELECTRONIC CIRCUITRY
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
SELECTING RESONANT CIRCUITS
TRANSMISSION
TUNING RESONANT CIRCUITS
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Summary:A compensation method of the input voltage of voltage-controlled crystal oscillator (VCO) in mobile unit is disclosed. The compensation method comprises the following steps: first, when the mobile unit and base station proceeds signal transmission at different power levels, the voltage difference measured at the automatic frequency control signal is defined as the pre-compensation value, so that different power levels have the corresponding pre-compensation value. Then, when the mobile unit intends to transmit the transmission signal (Tx) to the base station, the digital signal processor (DSP) of the mobile unit proceeds compensation to the VCO by the pre-compensation value, so that the frequency of transmission signal (Tx) of mobile unit corresponds at the predetermined frequency by the receiving signal (Rx) of the base station.
Bibliography:Application Number: TW200392117997