NSB–6
System Module
PAMS Technical Documentation
Page 47
Issue 1 06/2000
E
Nokia Mobile Phones Ltd.
is only about 5 ms for the AFC–voltage to settle. When the first burst
comes in system clock has to be settled into +/– 0.1 ppm frequency accu-
racy. The VCTCXO–module requires also 5 ms to settle into final frequen-
cy. Amplitude rises into full swing in 1...2 ms, but frequency settling time is
higher so this oscillator must be powered up early enough.
DC–compensation
DC compensation is made during DCN1 and DCN2 operations (controlled
via serial bus). Charging the large external capacitors in AGC stages to a
voltage which cause a zero dc–offset carries out DCN1. DCN2 set the
signal offset to constant value (RXREF 1.2 V).
Receiver characteristics
Item
Values
Type
Direct conversion, Linear, DualBand, FDMA/
TDMA
LO frequencies
3520 ... 3840 MHz / 3700 ... 3980 MHz
Typical 3 dB bandwidth
+/– 91 kHz
Sensitivity
min. – 102 / – 102 dBm (GSM/GSM1900) , S/N
>8 dB
Total typical receiver voltage gain ( from antenna
to RX ADC )
86 dB
Receiver output level ( RF level –95 dBm )
230 mVpp , single ended I/Q–signals to RX
ADCs
Typical AGC dynamic range
83 dB
Accurate AGC control range
50 dB
Typical AGC step in LNA
33 dB
Usable input dynamic range
–102 ... –10 dBm
RSSI dynamic range
–110 ... –48 dBm
Compensated gain variation in receiving band
+/– 1.0 dB
Transmitter characteristics
Item
Values
Type
Direct conversion, dualband, non–linear, FDMA/TDMA
LO frequency range
3520 ... 3660 / 3700 ... 3820 MHz
Output power
2 W / 1 W peak
Gain control range
min. 30 dB
Maximum phase error ( RMS/peak )
max 5 deg./20 deg. peak
