Custom MMIC

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The CMD281 is negative controlled, wideband

GaAs MMIC 2-bit digital attenuator die which

operates from DC to 40 GHz. Each bit of the

attenuator is controlled by a single voltage of

either 0 V or –5 V. The attenuator bit values

are 2 dB and 4 dB, for a total attenuation of 6

dB. The CMD281 has a low insertion loss of

1.2 dB at 18 GHz and the attenuation accuracy

is typically 0.1 dB step error. The CMD281 is a

50 ohm matched design which eliminates the

need for RF port matching. The CMD281 of-

fers full passivation for increased reliability

and moisture protection.

► Ultra wideband performance

► Low insertion loss

► Wide attenuation range

► Small die size

Features

Description

Functional Block Diagram

ver 1.1 0718

Parameter

Min

Typ

Max

Units

Frequency Range

DC – 40

GHz

Insertion Loss

1.2

dB

Attenuation Range

6

dB

Input Return Loss

20

dB

Output Return Loss

20

dB

Input IP3

42

dBm

Input P0.1dB

28

dBm

Switching Speed

25

ns

CMD281

DC-40 GHz 2-bit Digital Attenuator