36-40GHz High Power Amplifier

CHA4094

Ref. : DSCHA40949349 – 15 Dec. 99

3/4

Specifications subject to change without notice

Route Départementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE

Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09

Typical On Jig Measurements

Bias Conditions : Tamb = +25°C, Vd = 3.5Volt, Vg = -0.2Volt.

-20

-15

-10

-5

0

5

10

15

30

32

34

36

38

40

Frequency (GHz)

Gain

OUT

IN

5

7

9

11

13

15

17

19

21

23

25

-5

0

5

10

15

20

Input power (dBm)

Freq= 36 GHz

Gain (dB)

Pout (dBm)

5

7

9

11

13

15

17

19

21

23

25

-5

0

5

10

15

Input power (dBm)

Freq= 38GHz

Gain (dB)

Pout (dBm)

5

7

9

11

13

15

17

19

21

23

25

-5

0

5

10

15

Input power (dBm)

Freq= 40GHz

Pout (dBm)

Gain (dB)

Application note

The given DC Bias condition in table or curves are for class A biasing point. This amplifier could be

used in class AB.

For this the Gate voltage must be adjusted for a total drain supply current of typically 500mA.

The loss in linear gain is around 0.4dB, but the output power at 1dB compression point is higher,

between 0.5 and 1dBm more.

This biasing point shows a main advantage in regard of thermal aspect. Indeed the junction

temperature in transistor decreases approximatively of 10°C for 20% reduction in drain current.