RH-41
System Module
CCS Technical Documentation
Page 46
Nokia Corporation Confidential
Issue 2 09/2003
AMPS/TDMA 800 MHz Front End
Typical values.
TDMA 1900 MHz Front End
TDMA 1900 LNA is discrete. It uses integrated Bias control block, which is inside Taco. In
the normal high-gain operation mode, the bias voltage 2.78V is connected onto the col-
lector and the sink type constant current source is connected onto the emitter. The bias
current source is adjustable from 0.5 mA to 7.5 mA with 0.5 mA step. The base is biased
from 2.78V voltage via resistor.
When LNA AGC step is enabled, LNA is in low gain operation mode. Voltage and current
bias sources and direction of current are switched on the contrary. In this operation
mode the LNA has good linearity, still low noise figure and about -3 dB gain.
During TX slot LNA is in power-down mode, which is executed by switching the bias cur-
rent source to 0 mA.
Gain relative accuracy in receiving band **
2
Gain absolute accuracy in receiving band **
4
* referenced to the sensitivity level
** After production alignment
Parameter
MIN
TYP
MAX
Unit/Notes
Diplexer input loss
0.35
0.4
0.45
dB
Duplexer input loss
2.5
3
4.1
dB
LNA gain: High gain mode
Low gain mode
16
-4.5
16.5
-4
17.3
-3.8
dB
dB
LNA noise figure*
1.4
1.7
2.3
dB
LNA 3rd order intercept (IIP3)*
-4
-3
-1.5
dBm
Bandfilter input loss
1.5
2
2.5
dB
Mixer gain*
6
7.5
8
dB
Mixer NF*
8
9
10.5
dB
Mixer IIP3*
4
4.5
5
dBm
Total:
Gain
18.2
18.6
20
dB
Noise Figure
4.6
5.5
7
dB
3rd order intercept (IIP3)
-8.9
-7.5
-6.8
dBm
*see Taco spec/measurements
ITEM
NMP Requirement