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8.5-11.0 GHz GaAs MMIC

Power Amplifier

Mimix Asia, Inc. (a subsidiary of Mimix Broadband, Inc.)

3F, 3-2 Industry East IX Road, Science-Based Industrial Park • Hsinchu, Taiwan, R.O.C

Tel +886-3-567-9680 • Fax +886-3-567-9433 • mimixbroadband.com

Characteristic Data and Specifications are subject to change without notice.

©2007 Mimix Broadband, Inc.

August 2007 - Rev 03-Aug-07

P1006-BD

App Note [1] Biasing

of three ways by using either Vgg (Pin #2), Vgr (pin #18) or Vg (pin #3 or #17).

1) Vgg (pin #2) applies a scaled gate voltage to all FETs through a FET / resistor divider (Vto compensated) bias network. Applying -5V to Vgg (pin #2)

will typically draw 4.2A with no further adjustment necessary. Wafer lot variation may result in some devices experiencing higher or lower drain

currents than the typical 4.2A.

2) Vgr (pin #18) applies a scaled gate bias to all FETs through a resistive divider network. Applying -5V to Vgr (pin #18) will typically draw 4.2A,

however, the gate bias will need to be actively adjusted to regulate the desired drain current.

3) Vg (pin #3 or pin #17) provides a direct gate bias input to all the MMIC stages. This method of biasing allows the user to control the total drain

current, without the scaling factor. The typically gate bias for operation is -0.9V.

Make sure to sequence the applied voltage to ensure that negative gate bias is available before applying the positive drain supply.

App Note [2] Bias Arrangement

device as possible. Additional DC bypass capacitance (~0.01 uF) is also recommended.

App Note [3] Further Information

Application Notes. Please refer to “Application of Mimix Broadband's X-Band, 10-Watt Power Amplifier MMIC” and “Epoxy Die Attach Considerations

for HPA MMICs.”

Bias Arrangement

Bypass Capacitors - See App Note [2]

XP1006

RF Out

Vd1a,2a,3a

Vgg

RF In

Vd1b,2b,3b

1

2

3 4

5

6

10

11

12

13

14

15

16

17

18

9

8

7

XP1006

MIMIX BROADBAND

10004966

TNO COPYRIGHT 2005

X=4940

Y=4290

Vd2a

RF In

RF Out

Vd1a

Vd3a

Vd2b

Vd3b

Vd1b

Vgg