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,

200 mA quiesent bias:

Figure 7. 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.

RF Input

1.2 pF

1.2 pF

2.7 nH

1.8 nH

RF Output

50 Ohm

.02

λ

110 Ohm

.03

λ

110 Ohm

.03

λ

50 Ohm

.02

λ

DUT

15 nH

15 Ohm

2.2

µF

Gate

DC Supply

47 nH

2.2

µF

Drain

DC Supply

Optimum OIP3

Freq

Gamma Source

Gamma Load

OIP3

Gain

P1dB

PAE

(GHz)

Mag

Ang

Mag

Ang

(dBm)

(dB)

(dBm)

(%)

0.9

0.776

152

0.549

-178

43.3

17.94

29.63

63.8

2.0

0.872

-171

0.683

-179

43.1

15.06

30.12

66.8

2.4

0.893

-162

0.715

-174

42.8

14.03

29.90

64.5

3.9

0.765

-132

0.574

-144

41.7

9.47

29.02

52

Optimum P1dB

Freq

Gamma Source

Gamma Load

OIP3

Gain

P1dB

PAE

(GHz)

Mag

Ang

Mag

Ang

(dBm)

(dB)

(dBm)

(%)

0.9

0.773

153

0.784

-173

38.0

19.28

31.9

54.23

2.0

0.691

147

0.841

-166

36.4

10.34

31.4

38.15

2.4

0.797

164

0.827

-166

36.2

8.43

31.2

37.38

3.9

0.602

-163

0.794

-155

35.4

7.03

31

32.72