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XX1001-QK Fiches technique(PDF) 4 Page - Mimix Broadband |
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XX1001-QK Fiches technique(HTML) 4 Page - Mimix Broadband |
4 / 5 page XX1001-QK, MTTF (yrs) vs. Backplate Temperature (°C) 1.0E+00 1.0E+01 1.0E+02 1.0E+03 1.0E+04 1.0E+05 55 65 75 85 95 Temperature (°C) 18.0-21.0/36.0-42.0 GHz Doubler and Power Amplifier, QFN, 7x7mm Page 4 of 5 App Note [1] Biasing - Please refer to the application diagram above for recommended biasing information. The table below shows the recommended drain currents for each stage. It is possible to bias each stage separately for greater bias control with the following conditions: Id1<1mA, Id2=20mA, Id3=40mA, Id4=70mA, Id5=150mA, Id6=270mA. 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 -0.7V. 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. Recommended Layout Bias Application Schematic X1001-QK MTTF Tables MTTF is calculated from accelerated life-time data of single devices and assumes an isothermal back-plate. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 16 15 17 18 19 20 21 22 23 24 25 26 27 28 RF IN RF OUT XX1001-QK Vg1 (-0.7V) 10 nF 1µF + 10 nF 1µF + 10 nF 1µF + 10 nF 1µF + Vd1 (+2.5V) Vg3,4,5 (-1.2V) Vg6 (-1.2V) 10 nF 1µF + 10 nF 1µF + 10 nF 1µF + 10 nF 1µF + Vg2 (-0.5V) Vd2 (+3V) Vd3,4,5 (+ 4.5V) Vd6 (+ 4.5V) Pin VD1 VD2 VD3,4,5 VD6 Voltage (V) 2.5 3.0 4.5 4.5 Current (ma) <1 20 260 270 Comment Drain Bias (Doubler) Drain Bias (Buffer Amp) Drain Bias (PA) Drain Bias (PA - final stage) 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. ©2009 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. March 2009 - Rev 21-Mar-09 |
Numéro de pièce similaire - XX1001-QK_09 |
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Description similaire - XX1001-QK_09 |
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