4

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:

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.

Typical Gammas at Optimum OIP3 at 4.5V 280 mA

Optimized for maximum OIP3 at 4.5V 280 mA

Freq (GHz)

OIP3

Gain

P1dB

PAE

Gamma Source

Gamma Load

0.9

46.42

16.03

26.67

45.80

0.305 < -140

0.577 < 162

2.0

45.50

15.07

28.93

50.30

0.806 < -179.2

0.511 < 164

2.4

44.83

12.97

29.03

45.70

0.756 < -167

0.589 < -168

3.9

43.97

6.11

27.33

33.90

0.782 < -162

0.524 < -153

Typical Gammas at Optimum P1dB at 4.5V 280mA

Optimized for maximum P1dB at 4.5V 280 mA

Freq (GHz)

OIP3

Gain

P1dB

PAE

Gamma Source

Gamma Load

0.9

39.29

20.90

30.49

41.00

0.859 < 165

0.757 < 179

2.0

41.79

14.72

30.60

45.30

0.76 < -171

0.691 < -168

2.4

42.37

11.25

30.24

39.70

0.745 < -166

0.694 < -161

3.9

42.00

5.63

28.26

25.80

0.759 < -159

0.708 < -149

RF Input

2.2

µF

Gate

Supply

Drain

Supply

15 Ohm

15 nH

1.8 nH

1.2 pF

50 Ohm

.02

50 Ohm

.02

110 Ohm

.03

110 Ohm

.03

1.2 pF

3.3 nH

RF Output

47 nH

2.2

µF

DUT

Typical Gammas at Optimum OIP3 at 4.5V 400 mA

Optimized for maximum OIP3 at 4.5V 400 mA

Freq (GHz)

OIP3

Gain

P1dB

PAE

Gamma Source

Gamma Load

0.9

49.15

16.85

27.86

44.20

0.5852 < -135.80

0.4785 < 177.00

2.0

48.18

14.72

29.36

48.89

0.7267 < -175.37

0.7338 < 179.56

2.4

47.54

12.47

29.10

46.83

0.6155 < -171.71

0.5411 < -172.02

3.9

45.44

8.05

28.49

37.02

0.7888 < -148.43

0.5247 < -145.84

Typical Gammas at Optimum P1dB at 4.5V 400 mA

Optimized for maximum P1dB at 4.5V 400 mA

Freq (GHz)

OIP3

Gain

P1dB

PAE

Gamma Source

Gamma Load

0.9

41.78

21.84

31.23

49.97

0.7765 < 168.50

0.7589 < -175.09

2.0

43.28

14.83

31.03

44.78

0.8172 < -175.74

0.8011 < -165.75

2.4

42.46

11.90

30.66

41.00

0.8149 < -163.78

0.8042 < -161.79

3.9

42.94

7.70

29.56

33.06

0.8394 < -151.21

0.7826 < -149.00