U1010-QH_10 Datasheet, PDF (3/5 Pages) Mimix Broadband – 17.0-34.0 GHz Up-Converter QFN, 4x4mm

17.0-34.0 GHz Up-Converter
QFN, 4x4mm
February 2010 - Rev 12-Feb-10
U1010-QH
App Note [1] Biasing - As shown in the Pin Designations table, the device is operated by biasing VD1 and VD2 at 4.0V with 130mA and
approximately 60mA respectively. VG2,3 and VSS require fixed voltage biasing with VSS biased at -4.0V and 45mA. It is recommended to use active
bias on VG1 to keep the current in VD1 constant in order to maintain the best performance over temperature. 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. Make sure to sequence the applied voltage to ensure negative gate bias is
available before applying the positive drain supply.
App Note [2] Board Layout - As shown in the board layout, it is recommended to provide 100pF decoupling caps as close to the bias pins as
possible, with additional 10µF decoupling caps.
Recommended Board Layout
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Characteristic Data and Specifications are subject to change without notice. ©2010 Mimix Broadband, Inc.
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