RF2125
The data below is valid only under small-signal conditions. The device needs to be biased in Class A, with the out-
put power below the 1-dB compression point. For large signal operation this data may be used as a starting point,
but further tuning to optimize performance will be required.
Voltage and idle current have only very limited effect on the input and output impedances, hence only one plot is
shown, valid for VCC=5 to 7V, and ICC=50 to 250mA.
2
RF2125 Gain
26
DB(|S[2,1]|)
24
22
20
18
16
14
12
10
8
Vcc=6.5V, Icc=200mA
DB(GMax)
Vcc=6.5V, Icc=200mA
DB(|S[2,1]|)
Vcc=5.0V, Icc=50mA
DB(GMax)
Vcc=5.0V, Icc=50mA
6
4
2
0
1
1.2
1.4
1.6
1.8
2
2.2
2.4
2.6
Frequency (GHz)
RF2125 Input / Output Impedance, Class A bias
RF2125 S12
-33
Swp Max
2.5GHz
DB(|S[1,2]|)
2.5 GHz
S11
-34
-35
-36
-37
S22
0
2.5 GHz
.
4
1 GHz
1 GHz
1
1.5
2
2.5
FREQUENCY (GHz)
Swp Min
1GHz
Rev A7 010112
2-65
RFMD [ RF MICRO DEVICES ]
