Dc Characteristics; Regulators; Part Lists - Nokia NHM-7 series Service Manual

NHM–7
System Module & UI

DC characteristics

Regulators

Transceiver has a multifunction power management IC on baseband sec-
tion, which contains among other functions; 7 pcs of 2.78 V regulators
and 4.8V up–switcher for charge pump.
All regulators can be controlled individually with 2.78 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.
Use of the regulators can be seen in the Power Distribution Diagram.
VrefRF01and VrefRF02 are used as the reference voltages for HAGAR
RF–IC, VrefRF01 (1.35V) for bias reference and VrfeRF02 (1.35V) for RX
ADC's reference.
Regulators (except VR2 and VR7) are connected to HAGAR. Different
modes were switched on by the aid of serial bus.
List of the needed supply voltages :
Volt. source
VR1
VR2
VR3
VR4
VR5
VR6
VR7
VrefRF01
VrefRF02
Vbatt
Page 30
Load
PLL charge pump (4,8 V)
TX modulator
VCTCXO + buffer
HAGAR IC (LNAs+mixer+DTOS)
HAGAR IC (div+LO–buff+prescaler),
HAGAR (Vdd_bb)
VCO
ref. voltage for HAGAR
ref. voltage for HAGAR
PA
E Nokia Corporation
PAMS Technical Documentation
Issue 1 10/2001