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XR1008-QB Datasheet(PDF) 5 Page - Mimix Broadband |
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XR1008-QB Datasheet(HTML) 5 Page - Mimix Broadband |
5 / 8 page Page 5 of 8 R1008-QB 35.0-45.0 GHz GaAs Receiver SMT, 7x7 mm 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. ©2010 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. July 2010 - Rev 23-Jul-10 Recommended Layout Active Bias Circuit App Note [1] Biasing - Please refer to the functional block diagram and pin-out table for biasing information.The device is operated by biasing VD=4.0V with ID=180 mA by adjusting the applied voltage on VG1.VG1 typically requires-0.5V to result in the drain current being 180mA.The nominal input impedance of this gate is 180Ohm, so it should be noted that the nominal gate current will be 2.7mA. Additionally, a fixed bias of VG2=-0.5V is required to bias the mixer and doubler. Adjusting VG2 above or below this value can adversely affect conversion gain, image rejection and intercept point performance. 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.The diagram “Active Bias Circuit” demonstrates a possible method for active biasing. 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.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 5.0V 4V, 180mA -5.0V 4.0V Vd Vg1 MMBT3906 1 5k76 12k1 12k1 MMBT3904 1 5R62 (sense) 100n 100R 1k0 BAV99 3 100n BAV99 3 10R 3.3V 4.0V I = 5-4 5.62 ( ) |
Similar Part No. - XR1008-QB_10 |
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Similar Description - XR1008-QB_10 |
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