AP622
UMTS-band 4W HBT Amplifier Module
Evaluation Board Bias Procedure
The following bias procedure is recommended to ensure proper functionality of AP622 in a laboratory environment. The sequencing is not
required in the final system application.
5V
28V
GND
28V
Turn-on Sequence:
1.
2.
3.
4.
Attach input and output loads onto the evaluation board.
Turn on power supply Vcc = +28V.
Turn on power supply Vpd = +5V.
Turn on RF power.
Turn-off Sequence:
1.
2.
3.
Notes:
1.
Turn off RF power.
Turn off power supply Vpd = +5V.
Turn off power supply Vcc = +28V.
Vpd is used as a reference for the internal active bias circuitry. It can be used to turn on/off the amplifier.
Specifications and information are subject to change without notice
WJ Communications, Inc
•
Phone 1-800-WJ1-4401
•
FAX: 408-577-6621
•
e-mail: sales@wj.com
•
Web site: www.wj.com
Page 2 of 4 March 2007
WJCI [ WJ COMMUNICATION. INC. ]
