XR1000 Datasheet, PDF (3/6 Pages) Mimix Broadband – 17.0-27.0 GHz GaAs MMIC Receiver

17.0-27.0 GHz GaAs MMIC
Receiver
May 2005 - Rev 13-May-05
R1000
App Note [1] Biasing - As shown in the bonding diagram, this device is operated with all three stages in
parallel, and can be biased for low noise performance or high power performance. Low noise bias is
nominally Vd=3V, Id=90mA and is the recommended bias condition. Power bias may be as high as
Vd=5.5V, Id=180mA. It is also recommended to use active biasing to keep the currents constant as the RF
power and temperature vary; this gives the most reproducible results. Depending on the supply voltage
available and the power dissipation constraints, the bias circuit may be a single transistor or a low power
operational amplifier, with a low value resistor in series with the drain supply used to sense the current.
The gate of the pHEMT is controlled to maintain correct drain current and thus drain voltage. The typical
gate voltage needed to do this is -0.5V. Typically the gate is protected with Silicon diodes to limit the applied
voltage. Also, make sure to sequence the applied voltage to ensure negative gate bias is available before
applying the positive drain supply.
App Note [2] Bias Arrangement - Each DC pad (Vd and Vg) 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.
MTTF Tables
These numbers were calculated based on accelerated life test information and thermal model analysis received from the fabricating foundry.
Backplate
Temperature
55 deg Celsius
75 deg Celsius
95 deg Celsius
Channel
Temperature
78 deg Celsius
98 deg Celsius
118 deg Celsius
Rth
MTTF Hours
FITs
-
85.3° C/W
-
9.93E+11
5.79E+10
4.49E+09
1.01E-03
1.73E-02
2.23E-01
Bias Conditions: Vd=3.0V, Id=90 mA
Backplate
Temperature
55 deg Celsius
75 deg Celsius
95 deg Celsius
Channel
Temperature
Rth
MTTF Hours
137 deg Celsius
157 deg Celsius
177 deg Celsius
-
82.9° C/W
-
7.98E+08
9.77E+07
1.44E+07
Bias Conditions: Vd=5.5V, Id=180 mA
FITs
1.25E+00
1.02E+01
6.93E+01
Mimix Broadband, Inc., 10795 Rockley Rd., Houston, Texas 77099
Tel: [phone] Fax: [phone] mimixbroadband.com
Page 3 of 6
Characteristic Data and Specifications are subject to change without notice. 2005 Mimix Broadband, Inc.
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