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Page 8 of 14 May 2007 ver 1

AP603

High Dynamic Range 7W 28V HBT Amplifier

1930-1990 MHz Application Note: Changing Icq Biasing Configurations

The AP603 can be configured to be operated with lower bias current by varying the bias-adjust resistor – R2. The

recommended circuit configurations shown previously in this datasheet have the device operating with a 160 mA as the

but will degrade the device’s efficiency. Measured data shown in the plots below represents the AP603 measured and

configured for 1.96 GHz applications. It is expected that variation of the bias current for other frequency applications will

produce similar performance results.

Icq

(mA)

R2

(Ω)

(V)

(V)

20

4.32k

5

2.46

40

2.33k

5

2.52

80

1.24k

5

2.61

120

852

5

2.68

160

649

5

2.74

200

521

5

2.80

260

398

5

2.89

320

313

5

2.98

Thermal Rise vs. Output Power vs. Icq

Vcc = 28V

0

20

40

60

80

100

18

20

22

24

26

28

30

32

Output Power (dBm)

20 mA

40 mA

80 mA

120 mA

160 mA

200 mA

260 mA

320 mA

C28

3.3pF

C7

1000pF

100pF

L3

C5

3.3pF

C29

1.2pF

100pF

W = .030”

L = 1.035”

4.7 nH

ACLR1 vs. Output Power vs. Icq

WCDMA, Vcc = 28V, 1960 MHz, 25 ˚C

-65

-60

-55

-50

-45

-40

-35

22

24

26

28

30

32

Average Output Power (dBm)

20 mA

40 mA

80 mA

120 mA

160 mA

200 mA

260 mA

320 mA

Icc vs. Output Power vs. Icq

WCDMA, Vcc = 28V, 1960 MHz, 25 ˚C

0

100

200

300

400

22

24

26

28

30

32

Average Output Power (dBm)

20 mA

40 mA

80 mA

120 mA

160 mA

200 mA

260 mA

320 mA

Efficiency vs. Output Power vs. Icq

WCDMA, Vcc = 28V, 1960 MHz, 25 ˚C

0

5

10

15

20

25

22

24

26

28

30

32

Average Output Power (dBm)

20 mA

40 mA

80 mA

120 mA

160 mA

200 mA

260 mA

320 mA

Gain vs. Output Power vs. Icq

CW tone, Vcc = 28V, 1960 MHz, 25 ˚C

9

10

11

12

13

14

22

26

30

34

38

Output Power (dBm)

20 mA

40 mA

80 mA

120 mA

160 mA

200 mA

260 mA

320 mA

Output Power vs. Input Power vs. Icq

CW tone, Vcc = 28V, 1960 MHz, 25 ˚C

22

26

30

34

38

10

14

18

22

26

Input Power (dBm)

20 mA

40 mA

80 mA

120 mA

160 mA

200 mA

260 mA

320 mA

Efficiency vs. Output Power vs. Icq

CW tone, Vcc = 28V, 1960 MHz, 25 ˚C

0

10

20

30

40

50

22

26

30

34

38

Output Power (dBm)

20 mA

40 mA

80 mA

120 mA

160 mA

200 mA

260 mA

320 mA

OIP3 vs. Output Power vs. Icq

CW Two-tone signal, 1960 MHz, ∆f = 1 MHz, Vcc = 28V, 25 ˚C

30

35

40

45

50

55

26

28

30

32

34

36

Output Power, PEP (dBm)

20 mA

40 mA

80 mA

120 mA

160 mA

200 mA

260 mA

320 mA

IMD3 vs. Output Power vs. Icq

CW Two-tone signal, 1960 MHz, ∆f = 1 MHz, Vcc = 28V, 25 ˚C

-60

-50

-40

-30

-20

26

28

30

32

34

36

Output Power, PEP (dBm)

20 mA

40 mA

80 mA

120 mA

160 mA

200 mA

260 mA

320 mA

IMD5 vs. Output Power vs. Icq

CW Two-tone signal, 1960 MHz, ∆f = 1 MHz, Vcc = 28V, 25 ˚C

-80

-70

-60

-50

-40

-30

-20

26

28

30

32

34

36

Output Power, PEP (dBm)

20 mA

40 mA

80 mA

120 mA

160 mA

200 mA

260 mA

320 mA