XP1044-QL_10 Datasheet, PDF (9/10 Pages) Mimix Broadband – 3W Power Amplifier ModuleMarch

3.5-6.0 GHz
3W Power Amplifier Module
March 2010 - Rev 30-Mar-10
P1044-QL
App Note [1] Biasing - The XP1044-QL requires power supply sequencing. Negative voltage supply (VG) needs to be turned on first and
then positive voltage can be applied to the drain (VD). When turning off the device, the positive supply (VD) should be turned off first and
then negative voltage (VG) can be removed.
The gate voltage is adjusted in order to set the drain current to the desired level. The gate voltage required to achieve a certain current can
vary over temperature and from one device to another due to pinch-off voltage variation. Constant drain current can be achieved by
implementing an active bias circuit which allows for temperature compensation and eliminates the effect of pinch off voltage variation.
The input stage transistor periphery is half of the output stage transistor periphery and therefore the gate voltages needed to set the first
stage current to 300mA and the second stage current to 600mA are the same. The gate voltages can be connected together and a single
active bias circuit can be implemented adding a total of 6 components at a cost of approximately $0.15.
Mimix Broadband, Inc., 10795 Rockley Rd., Houston, Texas 77099
Tel: [phone] Fax: [phone] mimixbroadband.com
Page 9 of 10
Characteristic Data and Specifications are subject to change without notice. ©2010 Mimix Broadband, Inc.
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