LG -V909DW Service Manual page 34

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3. TECHNICAL BRIEF
RX LO
In addition to driving the LO distribution circuits for PRx downconversion, the PRx oscillator output is also
used as the DRx LO during mobile receive diversity (MRD) or GSM operation. Although there are separate
oscillators for SHDR and GNSS operation, they share a single set of phase-locked loop circuits. Since the PLL is
shared, only one receiver can be supported at any one time – either a SHDR path or the GNSS path can be
active. The SHDR oscillator control voltage is brought off-chip to allow supplemental capacitance to be
added, though this is not expected to be used.
[Figure 3-12] MDM RX LO circuits
LGE Internal Use Only
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Copyright © 2011 LG Electronics. Inc. All right reserved.
Only for training and service purposes

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