User Guide

PAMS
Technical Documentation
NME–3
Technical Information
Page 39
Issue 1 10/99
RF
Table 17. Main RF characteristics
Item Values
Receive frequency range 935 ... 960 MHz
Transmit frequency range 890 ... 915 MHz
Duplex spacing 45 MHz
Channel spacing 200 kHz
Number of RF channels 124 (+50)
Power class 2 (39 dBm)
Number of power levels 18
Maximum Ratings
Nominal PA voltage: 13.5V
Lower extreme supply PA voltage: 10.5V
Higher extreme supply PA voltage: 16.5V
Nominal BB supply voltage is (CCONT) : 2.80V
Lower extreme voltage: 2.70V
Higher extreme voltage: 2.85V
Supply voltage for PA control logic: 8.00V
Lower extreme voltage: 7.60V
Higher extreme voltage: 8.40V
Supply voltage for charge pumps(CCONT) : 5.00V
Lower extreme voltage: 4.8V
Higher extreme voltage: 5.2V
Power Distribution
The following diagram shows the power distribution of the GM8B rf
engine. All major rf modules are supplied with 2.85V from the BB ASIC
CCONT. The specification of the regulators in the CCONT ASIC can be
found in one of the following tables. In addition to this there is a dedicated
8V regulator for the supply of the PA control circuits as well as some buffer
stages. The rf power amplifier itself is directly supplied by the car battery.