Power Levels (Txc) Vs. Channel; Power Levels Vs. Battery Voltage; Tx Power Up/Down Ramps; Modulator Output Level - Nokia NSW-5 Series Service Manual

NSW-5
System Module UT5U
change, temperature measurement is done by using NTC resistor. A
Factor table is used for temperature compensation. The table values are
defined without factory measurements. Temperature is measured and
right compensation value is added to TXC–value. Requirement for com-
pensation update is for every 1 minutes or after every 5 C of temperature
change. This means that the PL2 output power is reduced linearily 0.5dB
when temperature inside the phone rises from +55 C to+80 C.

Power Levels (TXC) vs. Channel

Duplexer frequency response ripple is compensated by software. Power
levels are calibrated on four channels in production. Values for channels
between these tuned channels are calculated using linear interpolation.

Power levels vs. Battery Voltage

To extend battery duration in digital mode, the output power is decreased
linearily from level 2 to –0.5 dB when battery voltage drops below 3.3V.

TX Power Up/Down Ramps

Transmitter output power up/down ramps are controlled by SW. A special
ramp tables are used for that. Requirement is for nine different ramps in
digital mode for both operating bands. Separate ramps are used in power
up and power down ramps.

Modulator Output Level

Maximum Pout level values:
–20dBm for power levels 2...5
–24dBm for power level 6
–28dBm for power level 7
–20dBm for power levels 8...10

Digital Mode RSSI

Digital mode RSSI vs. input signal is calibrated in production, but RSSI
vs. RSSI vs. channel are compensated by software.

RF Block Specifications

Receiver

DAMPS 800MHz RX Front End

Receiver front end is integrated in the IC. It has a RF low noise amplifier
with a gain step and an active mixer. RX interstage filter is a SAW filter.
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PAMS Technical Documentation
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