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XU1009-BD-EV1 Datasheet(PDF) 6 Page - Mimix Broadband |
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XU1009-BD-EV1 Datasheet(HTML) 6 Page - Mimix Broadband |
6 / 9 page 18.0-36.0 GHz GaAs MMIC Transmitter Page 6 of 9 MTTF These numbers were calculated based on accelerated life test information and thermal model analysis received from the fabricating foundry. App Note [1] Biasing - As shown in the bonding diagram, this device is operated by separately biasing Vd(1,2,3)=5.0V, Vss=-5.0V, Id1=230mA, Id2=140mA, Id3=75mA and Iss=50mA. Additionally, a mixer and doubler bias are also required with Vg3=Vg4=-0.5V. Adjusting Vg3 and Vg4 above or below this value can adversely affect conversion gain, LO/RF isolation and intercept point performance. Gain control can be adjusted by varying Vg1 from 0.0 to -1.2 V with 0.0 V providing minimum attenuation and -1.2 V providing maximum attenuation. 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 -0.2V. 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 Parallel Stage Bias (Recommended for general applications) -- The same as Individual Stage Bias but all the drain or gate pad DC bypass capacitors (~100-200 pF) can be combined. Additional DC bypass capacitance (~0.01 uF) is also recommended to all DC or combination (if gate or drains are tied together) of DC bias pads. For Individual Stage Bias -- Each DC pad (Vd1,2,3, Vss, and Vg1,2,3,4) 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. 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. 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. U1009-BD July 2007 - Rev 27-Jul-07 XU1009-BD MTTF (hours) vs. Backplate Temp (degC) Nominal Datasheet Bias Conditions 1.0E+04 1.0E+05 1.0E+06 1.0E+07 1.0E+08 1.0E+09 1.0E+10 20 30 40 50 60 70 80 90 100 110 120 130 Backplate Temp (C) |
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