Nokia 8850 Manual Do Serviço
NSM–2
System Module
System Module
PAMS Technical Documentation
Page 38
Issue 1 12/1999
Nokia Mobile Phones Ltd.
RF Frequency Plan
HAGAR
PLL
26 MHz
VCTCXO
f
f/2
f/2
f
3420–
3840
MHz
3840
MHz
925–960
MHz
MHz
880–915
MHz
MHz
I–signal
1805–1880
MHz
MHz
f
f/2
f
f/2
1710–1785
MHz
MHz
Q–signal
I–signal
I–signal
I–signal
RX
TX
I–signal
Q–signal
DC characteristics
Regulators
Transceiver has a multi function power management IC at baseband sec-
tion, which contains among other functions, also 7 pcs of 2.8 V regulators.
All regulators can be controlled individually with 2.8 V logic directly or
through control register. In GSM direct controls are used to get fast
switching, because regulators are used to enable RF–functions.
tion, which contains among other functions, also 7 pcs of 2.8 V regulators.
All regulators can be controlled individually with 2.8 V logic directly or
through control register. In GSM direct controls are used to get fast
switching, because regulators are used to enable RF–functions.
VREF_2 from CCONT IC and RXREF from COBBA IC are used as the
reference voltages for HAGAR RF–IC, VREF_2 (1.5V) for bias reference
and RXREF (1.2V) for RX ADC’s reference.
reference voltages for HAGAR RF–IC, VREF_2 (1.5V) for bias reference
and RXREF (1.2V) for RX ADC’s reference.