XR1011-QH_16 Datasheet, PDF (6/8 Pages) M/A-COM Technology Solutions, Inc. – Integrated LNA, Mixer and LO Buffer Amplifier

XR1011-QH
Receiver
4.5 - 10.5 GHz
Rev. V1
App Note [1] Biasing - As shown in the Pin Designations table, the device is operated by biasing VD1,2,3
at 4.0 V with 25, 45, 60 mA respectively. Additionally, a fixed voltage bias of -2 V is required for mixer bias.
It is recommended to use active bias to keep the currents 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 -0.3 V.
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 10 μF decoupling caps.
Recommended Board Layout
Recommended Decoupling Capacitors: 100pF0402,
10μF 0805
Recommend to externally ground all N/Cpins
6
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