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Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3.4 LO Phase-locked Loop
Most LO functions are fully integrated on-chip, do not require user adjustment, and need not be
considered by handset designers. QUALCOMM has established and implemented frequency plans
and LO generation schemes that support the radioOne 6250-IIseries chipset while requiring minimal
off-chip design effort. Only one area requires handset designer attention: the loop filters of each
phase-locked loop (PLL).
3.4.1 UMTS Rx PLL (PLL2)
UMTS Rx LO functional blocks are distributed between the RFR6250 IC, RTR6250 IC, and external
UMTS_RX_CH_VCO and loop filter components (Figure 1.4.1-1). The external UMTS_RX_CH_VCO
must be enabled for UMTS Rx operation and disabled otherwise; a dedicated MSM6275 IC signal
(UHF_VCO_EN ) enables the VCO.
3. TECHNICAL BRIEF
Figure 1.4.1-1 UMTS Rx PLL functional block diagram
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