1St Tx Buffer; Tx Interstage Filters; 2Nd Tx Buffer - Nokia 9000i Service Manual

RAE/RAK–1N
RF

1st TX buffer

The TX buffer is a bipolar transistor amplifier. It amplifies the TX signal
coming from the upconversion mixer.
Parameter
Operating freq. range GSM
PCN
Supply voltage
Current consumption
GSM / PCN
Insertion gain GSM
PCN
Input VSWR (Zo=50 ohms)
Output VSWR (Zo=50 ohms)

TX interstage filters

The TX filters reject the spurious signals generated in the upconversion
mixer. They also reject the local, image and IF signal leakage and RX
band noise.

2nd TX buffer

The TX buffer is a bipolar transistor amplifier. It amplifies the TX signal
coming from the first interstage filter.
Parameter
Operating freq. range GSM
PCN
Supply voltage
Current consumption GSM
PCN
Insertion gain GSM
PCN
Output power (Zo=50 ohms)
GSM
PCN
Input VSWR (Zo=50 ohms)
Output VSWR (Zo=50 ohms)
Page 3– 20
Table 12. 1st TX amplifier specification
Minimum Typical /
Nominal
890
1710
4.25
11
10
Table 13. 2nd TX amplifier specification
Minimum Typical /
Nominal
890
1710
4.25
16.0
11
15
0
2
Technical Documentation
Maximum
915
1785
4.5 4.8
4.5 5.0
12 13
11 12
2.0
2.0
Maximum
915
1785
4.5 4.8
9.0 10.0
17.0
12 13
16 17
3
7
2.0
2.0
Amendment 1 04/97
After Sales
Unit / Notes
MHz
MHz
V
mA
dB
dB
Matched to the mixer
Unit / Notes
MHz
MHz
V
mA
mA
dB
dB
dBm
dBm