D1008-QH Datasheet, PDF (7/9 Pages) Mimix Broadband – 30.0 kHz-32.0 GHz GaAs MMIC

30.0 kHz-32.0 GHz GaAs MMIC
Distributed QFN Packaged Amplifier
December 2009 - Rev 08-Dec-09
D1008-QH
App Note [1] Biasing - As shown in functional schematic, the device is operated by typically biasing the drain with 4.0
to 7.0 V and 160 to 200 mA through a bias tee at RFout. The drain current is controlled by the gate bias at VG1 which is
typically at -2.5 V for normal operation. It is recommended to use active bias to keep the currents constant in order to
maintain the best performance over temperature. Depending on the supply voltage available and the power dissipatior
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 -2.5V. 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 pin (Vd and Vg) needs to have DC bypass capacitance (100pF/10nF/1uF) as
close to the package as possible.
MTTF
XD1008-QH: MTTF (hours) at Vd=7V, 200mA
1.0E+14
1.0E+13
1.0E+12
1.0E+11
1.0E+10
1.0E+09
1.0E+08
1.0E+07
1.0E+06
1.0E+05
1.0E+04
20 30 40 50 60 70 80 90 100 110 120
Backplate Temp (^oC)
200
180
160
140
120
100
80
60
40
20
0
20
XD1008-QH: Max. Tch (ºC) at Vd=7V, 200mA
30 40 50 60 70 80 90 100 110 120
Backplate Temp (^oC)
XD1008-QH: Operating Power De-rating Curve
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
25
50
75
100
125
150
Backplate Temp (^oC)
Mimix Broadband, Inc., 10795 Rockley Rd., Houston, Texas 77099
Tel: [phone] Fax: [phone] mimixbroadband.com
Page 7 of 9
Characteristic Data and Specifications are subject to change without notice. ©2009 Mimix Broadband, Inc.
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