5.0-20.0 GHz GaAs MMIC
Low Noise Amplifier
April 2007 - Rev 19-Apr-07
L1005-BD
App Note [1] Biasing - As shown in the bonding diagram, this device is operated with a single drain and two gate
voltages. Bias is nominally Vd=5.0V,Vg1=-0.3V,Vg2=1.5V, and Id=30mA. It is 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 0.0V.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 Vg1,2) need 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.
MTTFTable (TBD)
These numbers were calculated based on accelerated life test information and thermal model analysis received from the fabricating foundry.
Backplate
Channel
Rth
MTTF Hours
FITs
Temperature
Temperature
55 deg Celsius
75 deg Celsius
95 deg Celsius
deg Celsius
deg Celsius
deg Celsius
C/W
C/W
C/W
E+
E+
E+
E+
E+
E+
Bias Conditions: Vd=5.0V, Id=30 mA
Page 5 of 6
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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