Nokia NSB-5 Series Technical Documentation Manual page 59

PAMS Technical Documentation
which is sampled so that no transmitter output RF signal is present during the measure-
ment. A settling time of about 1ms should be allowed before the sampling is done after a
transmitted burst. The values of the U
The loop amplifier input offset correction voltage ranges from –70mV to 70mV. The
actual value will be measured for each RF module in production tuning. As this is likely
to be a fixed correction it can be included in the stored values of U
arithmetics needed to calculate the power control voltage.
If needed, temperature indication can be derived from the value of U
voltage U
tempref
voltage is the value of U
The accuracy requirement for the temperature measurement won't be particularly high
so that the calibration shouldn't call for any special arrangements deviating from the RF
tuning procedure. U
A frequency correction is possibly needed in U
at higher end of the transmitter band and possible frequency slope of the directional
coupler coupling factor.
To correct for the first TX slot (after phone is powered up), the bias voltage will be mea-
sured by MCU during the IDLE MODE and the TXC value corrected by DSP. Otherwise, the
bias voltage will be measured during the IDLE FRAME, with the TXC valued updated in
the next multi–frame. This means a worst case delay of approximately 120 msec.
Issue 1 03/01
bias
however is needed to calibrate the temperature scale. The reference
measured at a known temperature during production tuning.
bias
shall be stored in the phone.
tempref
Nokia Mobile Phones Ltd.
range approximately from 50mV to 200mV.
. This is due to duplex filter attenuation
rf
NSB-5
System Module
which saves the
rf
. A reference
bias
Page 59