Fig 7 Rf Power Supply Configuration - Nokia NPL-4 Series Troubleshooting Instructions

Nokia Customer Care
The RF front-end is a triple-band direct conversion transceiver. Using direct conversion,
no intermediate frequencies are used for up- or down-conversion.
GSM: 869-894 MHz
925-960 MHz
DCS: 1805-1880 MHz
PCS: 1930-1990 MHz
DCS: 1710-1785 MHz
PCS: 1850-1910 MHz
GSM: 824-849 MHz
880-915 MHz
Copyright © 2005 Nokia Corporation. All rights reserved.
Issue 2 05/05
Company confidential
Figure 7: RF Power Supply Configuration
f/4 f/2
f f
f f
f/4 f/2
PLL
Troubleshooting Instructions
Helgo
3296-
3980
MHz
26 MHz
VCTCXO
Buffer
NPL-4/5/
I-signal
RX
Q-signal
AFC
VCTCXO
26 MHz
I-signal
TX
Q-signal
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