Rf Frequency Plan; Dc Characteristics; Regulators - Nokia NSB-7 Series Service Manual

PAMS Technical Documentation

RF Frequency Plan

DC Characteristics

Regulators

Transceiver has a multi function power management IC at baseband section, which con-
tains among other functions also 7 pcs of 2.8 V regulators. All regulators can be con-
trolled individually with 2.8 V logic directly or through control register. In GSM direct
controls are used to get fast switching because the 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.
Issue 1 06/00
Figure 13: RF Frequency Plan
ãNokia Mobile Phones Ltd.
NSB-7
System Module
Page 45