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3. TECHNICAL BRIEF
3.5.11 UMTS Rx VCO (X100 : MQW541A1G44)
The UMTS dual-band Rx VCO is a key component in PLL2; VCO performance directly impacts Polar
calibration accuracy and UMTS receiver performance. When the phone is not in the UMTS mode the
unused VCO must be turned off by UHF_VCO_EN signal from MSM6275. Using only the external
UMTS_RX_VCO signal, the LO generation and distribution circuits create the necessary LO signals for
the quadrature down-converter.
LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Summary of Contents for TU550
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