12.0-40.0 GHz GaAs MMIC
Image Reject Mixer
September 2007 - Rev 04-Sep-07
M1001-BD
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.
App Note [3] USB/LSB Selection -
For Upper Side Band Operation (USB):
With IF1 and IF2 connected to the
LSB
USB
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 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.
IF2
IF1
Note:
The coupled port can be used as an alternate
input but the port location of the Coupled and
Direct ports reverse.
An alternate method of Selection of USB or LSB:
LSB
In Phase Combiner
-90o
USB
In Phase Combiner
-90o
IF2
IF1
IF2
IF1
Page 8 of 9
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. ©2007 Mimix Broadband, Inc.
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