Mimix Broadband, Inc., 10795 Rockley Rd., Houston, Texas 77099

Tel: 281.988.4600 Fax: 281.988.4615 mimixbroadband.com

Characteristic Data and Specifications are subject to change without notice.

©2005 Mimix Broadband, Inc.

Export of this item may require appropriate export licensing from the U.S. Government. In purchasing these parts, U.S. Domestic customers accept

their obligation to be compliant with U.S. Export Laws.

Page 8 of 9

App Note [3] USB/LSB Selection

-

Note:

The coupled port can be used as an alternate

input but the port location of the Coupled and

Direct ports reverse.

USB

LSB

IF1

IF2

An alternate method of Selection of USB or LSB:

12.0-40.0 GHz GaAs MMIC

Image Reject Mixer

M1001

App Note [1] Biasing

- As shown in the bonding diagram, the pHEMT mixer devices are operated using a

separate gate voltage Vg1. Set Vg1=-0.5V for optimum conversion loss performance.

App Note [2] Bias Arrangement

- Each DC pad (Vg1) needs to have DC bypass capacitance (~100-200 pF) as

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

For Lower Side Band Operation (LSB):

With IF1 and IF2 connected to the

direct port (0º) and coupled port (90º)

respectively as shown in the diagram,

the LSB signal will reside on the input

port. The isolated port must be loaded

with 50 ohms.

With IF1 and IF2 connected to the

direct port (0º) and coupled port (90º)

respectively as shown in the diagram,

the USB signal will reside on the

isolated port. The input port must be

loaded with 50 ohms.

For Upper Side Band Operation (USB):

-90

o

In Phase Combiner

USB

In Phase Combiner

LSB

-90

o

IF2

IF1

IF2

IF1

November 2005 - Rev 21-Nov-05