4.0-11.0 GHz GaAs MMIC
Buffer Amplifier, QFN
September 2007 - Rev 15-Sep-07
B1007-QT
App Note [1] Biasing -
The device provides variable gain with adjustable bias regulation. For optimum linearity performance, it is recommended
to bias this device at Vd=4V with Id=90 mA. It is also recommended to use active biasing to control the drain currents because this gives the most
reproducible results over temperature or RF level variations. 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.
MTTF Graphs
1.00E+09
These numbers were calculated based on accelerated life test information and thermal model analysis received from the fabricating foundry.
XB1007-QT Vd=4.0 V Id=130 mA
1.00E+04
XB1007-QT Vd=4.0 V Id=130 mA
1.00E+08
1.00E+03
MTTF (hours)
1.00E+07
FITS
1.00E+02
1.00E+06
1.00E+01
1.00E+05
55
65
75
85
95
105
115
125
Backplate Temperature (deg C)
1.00E+00
55
65
75
85
95
105
115
125
Backplate Temperature (deg C)
XB1007-QT Vd=4.0 V Id=130 mA
172
170
168
166
164
220
210
200
190
XB1007-QT Vd=4.0 V Id=130 mA
Rth (deg C/W)
158
156
154
152
150
148
146
144
142
140
55
65
75
85
95
105
115
125
Backplate Temperature (deg C)
Tch (deg C)
162
160
180
170
160
150
140
130
120
55
65
75
85
95
105
115
125
Backplate Temperature (deg C)
Mimix Broadband, Inc., 10795 Rockley Rd., Houston, Texas 77099
Tel: 281.988.4600 Fax: 281.988.4615 mimixbroadband.com
Page 5 of 6
Characteristic Data and Specifications are subject to change without notice.
©2007
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.
MIMIX [ MIMIX BROADBAND ]
