LG 501C Service Manual page 37

LG501C
1.4 Description of Frequency Synthesizer Circuit
1.4.1 Voltage Control Temperature Compensation Crystal Oscillator (VCTCXO, X2201)
The temperature variation of mobile phone can be compensated by TCXO. The reference frequency of a mobile
phone is -30~+85 C. The receives frequency tuning signals called TRK_LO_ADJ from QSC6055 as 0.5V~2.5V DC
via R and C filter in order to generate the reference frequency of 19.2MHz and input it into the frequency synthesizer
of UHF band. Frequency stability depending on temperature is 1.5 ppm.
LG Electronics Inc.
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