Nokia NHM-7 series, Service Manual, Page: 42 / 212

NHM–7
System Module & UI
PAMS Technical Documentation
Page 30 Issue 1 10/2001
Nokia Corporation
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 Load
VR1 PLL charge pump (4,8 V)
VR2 TX modulator
VR3 buffer
VR4 HAGAR IC (LNAs+mixer+DTOS)
VR5 HAGAR IC (div+LO–buff+prescaler),
VR6 HAGAR (Vdd_bb)
VR7 VCO
VrefRF01 ref. voltage for HAGAR
VrefRF02 ref. voltage for HAGAR
Vbatt PA