Transmitter Part; Vctcxo ( Voltage Controlled Temperature Compensated Crystal Oscillator ):V801 - Pantech PG-3210 Service Manual

PG-3210 Service Manual

4.2.4.2 Transmitter Part

A. 3 dB attenuator
These passive components are adopted for PAM to operate in a stable output power.
B. FEM(Front End Module / built in LPF)
These filters pass through the signals of which frequency band of 824~849MHz,
1710MHz~1785MHz, 1850MHz~1910MHz which is the transmit frequency of GSM850, DCS,
PCS system terminal, and it suppresses other images and spurious frequencies when the
terminal transmits GMSK modulated frequencies.
C. Power AMP Module(PAM)
This device amplifies signals ahead of transmiting them through the antenna to provide a sufficient
RF power. It has amplification factor of 28dB and efficiency of about 50% typically in GSM850 band
and amplification of 20dB and efficiency of about 50% typically in DCS/PCS band.
4.2.5 VC-TCXO(Voltage Controlled Temperature Compensated Crystal Oscillator)
This is the mobile station's reference frequency source. Its frequency is 26MHz, this signal is
applied to the XOUT Buffer in Si4210 and the XOUT Buffer provides the 13MHz system reference
clock.
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