acpm-7891 Avago Technologies, acpm-7891 Datasheet - Page 19

• Manufacturer Part Number: acpm-7891
• Description: Agilent Acpm-7891 Tri-band Power Amplifier Module Egsm, Dcs And Pcs Multi-slot Gprs -
• Manufacturer: Avago Technologies

19
Test Results
Using the demoboard with the
Linear Technology IC, the results
shown in Table 4 were obtained.
The LTC1758 RAMP signal is
generated from a DAC and a
simple single-pole filter is used
to shape the power ramp. The
input RF signal is based on the
GSM GMSK modulated signal.
Table 4. Results with variable Vdd and three point frequency ranges
GSM900
Frequency
900 MHz
DCS1800
Frequency
1750 MHz
PCS1900
Frequency
1880 MHz
Vdd
(V)
3.0
3.6
4.3
Vdd
(V)
3.0
3.6
4.3
Vdd
(V)
3.0
3.6
4.3
GSM5 (33 dBm)
Vapc
(V)
2.00
1.60
1.58
DCS0 (30 dBm)
Vapc
(V)
2.0
1.7
1.7
PCS0 (30 dBm)
Vapc
(V)
1.95
1.7
1.7
Pout
(dBm)
33.07
33.04
33.04
Pout
(dBm)
30.35
30.32
30.28
Pout
(dBm)
29.26
29.24
29.20
The results highlight the excellent
power control functionality
obtained by using the ACPM-7891
in conjunction with a power loop
controller such as the LT1758.
Results are given for all three
bands, at four example power
level settings, with the supply
voltage at 3V, 3.6V and 4.3V. The
figures show that excellent power
output control is maintained over
GSM10 (23 dBm)
Vapc
(V)
1.3
1.3
1.3
DCS5 (20 dBm)
Vapc
(V)
1.3
1.3
1.3
PCS5 (20 dBm)
Vapc
(V)
1.3
1.3
1.3
Pout
(dBm)
23.54
23.55
23.56
Pout
(dBm)
20.20
20.17
20.14
Pout
(dBm)
20.12
20.10
20.07
GSM15 (13 dBm)
Vapc
(V)
1.1
1.1
1.1
DCS10 (10 dBm)
Vapc
(V)
1.1
1.1
1.1
PCS10 (10 dBm)
Vapc
(V)
1.1
1.1
1.1
this supply voltage range, illus-
trating that the ACPM-7891 can
enable designs that meet GSM
transmitter specifications.
Pout
(dBm)
13.49
13.51
13.52
Pout
(dBm)
10.42
10.40
10.37
Pout
(dBm)
10.64
10.60
10.56
GSM19 (5 dBm)
Vapc
(V)
1.0
1.0
1.0
DCS15 (0 dBm)
Vapc
(V)
1.0
1.0
1.0
PCS15 (0 dBm)
Vapc
(V)
1.0
1.0
1.0
Pout
(dBm)
5.12
5.09
Pout
(dBm)
0.06
0.06
Pout
(dBm)
5.09
0.08
-0.04
-0.05
-0.09