AN-109 Datasheet, PDF (1/3 Pages) IXYS Corporation – Variable-Speed Motor Controller

VCO Application Note
AN-109
Phase Noise Measurement of Z-Communications VCOs
Phase noise of ZCOMM VCOs (free running) can be measured at different
offsets, using the test set up and procedure below.
Figure AN-109:1- VCO Phase Noise Measurement Setup
Procedure using Agilent Technologies E5052A Signal Source Analyzer
(10MHz-7GHz):
To ensure an accurate phase noise measurement, we use our eval boards
or test fixtures. You can pick the appropriate one for the VCO you are
using by referring to the link below:
http://www.zcomm.com/products/eval_boards.shtml
Test Setup
If you are using a ZCOMM test fixture:
Insert the VCO in the test fixture, making sure the orientation is
correct and it is properly grounded. Then adjust the position of the
test fixture latch so that it locks down on the VCO under test.
If you are using a ZCOMM eval board:
Solder the VCO with correct orientation to the eval board, ensuring
proper GND contact.
We recommend using a minimum of 6dB pad at the RF-Out port of the test
fixture, to ensure proper isolation and output load
matching.
Using shielded (preferably double shielded) coaxial and RF cables with
minimum possible length:
-Connect the Vt port (of test fixture/eval board) to DC Control (of
Signal source Analyzer).
-Connect Vcc Port (of test fixture/eval board) to DC Power (of Signal
Source Analyzer).