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AV850M2-00

18–40 GHz GaAs MMIC Voltage Variable Attenuator

Alpha Industries 

18–40 GHz GaAs MMIC Voltage Variable Attenuator

AV850M2-00

Typical Performance Data

0

VC2:

-1.6 – -3.0

-5

-1.4

-10

-15

-1.2

-20

-25

-1.0

-0.8

-30

-0.6

-35

-0.4

-40

-0.2

0.0

-45

20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50

Frequency (GHz)

Attenuation vs. Frequency (VC1 = 0 V)

28

26

24

22

20

18

16

14

12

10

8

6

4

2

0

-2

-20 -18 -16 -14 -12 -10 -8 -6 -4 -2 0

Attenuation (dB)

Attenuation vs. 1.0 dB Compression

0

-5

20 GHz

-10

30 GHz

-15

40 GHz

-20

-25

50 GHz

-30

-35

-40

VC1 = 0 V

-45

-3.0 -2.6 -2.2 -1.8 -1.4 -1.0 -0.6 -0.2 0

Control Voltage VC2 (V)

Attenuation vs. Control Voltage

Knee

Knee

Knee

Voltage 1 Voltage 2 Voltage 3

0

-5

*

VC1 = -1V

-10

-15

-20

*

-25

-30

Example Chip 1

-35

Example Chip 2

Example Chip 3

-40

-3.25

-0.25

Control Voltage VC2 (V)

Example Chip-to-Chip Variation for Any

Single-Frequency of Operation

(Low-Frequency Band)

* Asterisk in graph indicates guaranteed attenuation limits from the Electrical

Specification table (knee voltage can vary from -3.25 V to approximately -1.0 V).

Bias Arrangement

VC2

RF

RF

VC1

VC1 controls the series devices, adjust for optimum VSWR.

VC2 controls the shunt devices, adjust to set attenuation.

Recommended Control Voltages:

For frequency 18–35 GHz: VC1 = -1 V, VC2 = -0.25 to -3.25 V.

For frequency 35–40 GHz: VC1 = 0 V, VC2 = -0.8 to -3.25 V.

Circuit Schematic

RF IN

RF OUT

VC2

VC1

2

Alpha Industries, Inc. [781] 935-5150 • Fax [617] 824-4579 • Email sales@alphaind.com • www.alphaind.com

Specifications subject to change without notice. 9/00A

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