XB1007-BD_07 Datasheet, PDF (8/9 Pages) Mimix Broadband – 4.0-11.0 GHz GaAs MMIC Buffer Amplifier

4.0-11.0 GHz GaAs MMIC
Buffer Amplifier
September 2007 - Rev 17-Sep-07
B1007-BD
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 (Vg2 at approximately -0.5V and Vg1 left open). 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.
App Note [2] Bias Arrangement - For Individual Stage Bias (Recommended for saturated applications) -- Each DC pad (Vd and Vg1,2) 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 Graphs
These numbers were calculated based on accelerated life test information and thermal model analysis received from the fabricating foundry.
1.00E+09
XB1007-BD Vd=4.0 V Id=130 mA
1.00E+04
XB1007-BD Vd=4.0 V Id=130 mA
1.00E+08
1.00E+03
1.00E+07
1.00E+02
1.00E+06
1.00E+01
1.00E+05
55
65
75
85
95
105
115
125
Backplate Temperature (deg C)
172
170
168
166
164
162
160
158
156
154
152
150
148
146
144
142
140
55
XB1007-BD Vd=4.0 V Id=130 mA
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)
220
210
200
190
180
170
160
150
140
130
120
55
XB1007-BD Vd=4.0 V Id=130 mA
65
75
85
95
105
115
125
Backplate Temperature (deg C)
Mimix Broadband, Inc., 10795 Rockley Rd., Houston, Texas 77099
Tel: [phone] Fax: [phone] mimixbroadband.com
Page 8 of 9
Characteristic Data and Specifications are subject to change without notice. ©2007 Mimix Broadband, Inc.
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