1.8 nH
1.2 pF
RF Input
15 nH
2.2
µF
50 Ohm
.02
110 Ohm
.03
110 Ohm
.03
50 Ohm
.02
1.2 pF
3.3 nH
DUT
47 nH
RF Output
15 Ohm
2.2
µF
Gate
Supply
Drain
Supply
Figure 3. Simplified schematic of production test board. Primary purpose is to show 15 Ohm series resistor placement in
gate supply. Transmission line tapers, tee intersections, bias lines and parasitic values are not shown.
Gamma Load and Source at Optimum OIP3 and P1dB Tuning Conditions
The device’s optimum OIP3 and P1dB measurements were determined using a load pull system at 4.5V
280 mA and 4.5V 400 mA quiesent bias respectively:
Typical Gammas at Optimum OIP3 at 4.5V 280 mA
Freq (GHz)
0.9
2.0
2.4
3.9
Optimized for maximum OIP3 at 4.5V 280 mA
OIP3
Gain
P1dB
46.42
45.50
44.83
43.97
16.03
15.07
12.97
6.11
26.67
28.93
29.03
27.33
PAE
45.80
50.30
45.70
33.90
Gamma Source
0.305 < -140
0.806 < -179.2
0.756 < -167
0.782 < -162
Gamma Load
0.577 < 162
0.511 < 164
0.589 < -168
0.524 < -153
Typical Gammas at Optimum P1dB at 4.5V 280mA
Freq (GHz)
0.9
2.0
2.4
3.9
Optimized for maximum P1dB at 4.5V 280 mA
OIP3
Gain
P1dB
39.29
41.79
42.37
42.00
20.90
14.72
11.25
5.63
30.49
30.60
30.24
28.26
PAE
41.00
45.30
39.70
25.80
Gamma Source
0.859 < 165
0.76 < -171
0.745 < -166
0.759 < -159
Gamma Load
0.757 < 179
0.691 < -168
0.694 < -161
0.708 < -149
Typical Gammas at Optimum OIP3 at 4.5V 400 mA
Freq (GHz)
0.9
2.0
2.4
3.9
Optimized for maximum OIP3 at 4.5V 400 mA
OIP3
Gain
P1dB
49.15
48.18
47.54
45.44
16.85
14.72
12.47
8.05
27.86
29.36
29.10
28.49
PAE
44.20
48.89
46.83
37.02
Gamma Source
0.5852 < -135.80
0.7267 < -175.37
0.6155 < -171.71
0.7888 < -148.43
Gamma Load
0.4785 < 177.00
0.7338 < 179.56
0.5411 < -172.02
0.5247 < -145.84
Typical Gammas at Optimum P1dB at 4.5V 400 mA
Freq (GHz)
0.9
2.0
2.4
3.9
Optimized for maximum P1dB at 4.5V 400 mA
OIP3
Gain
P1dB
41.78
43.28
42.46
42.94
21.84
14.83
11.90
7.70
31.23
31.03
30.66
29.56
PAE
49.97
44.78
41.00
33.06
Gamma Source
0.7765 < 168.50
0.8172 < -175.74
0.8149 < -163.78
0.8394 < -151.21
Gamma Load
0.7589 < -175.09
0.8011 < -165.75
0.8042 < -161.79
0.7826 < -149.00
4
HP [ AGILENT(HEWLETT-PACKARD) ]
