The RF Calculator
The RF Calculator is a Windows Application, available to all tuner users, that allows calculating instantaneously the effects of insertion losses on tuning range, possible measurement errors in Load Pull and Noise measurements as well as the effect of RF probes and test fixtures (full S2P files) on tuning capability, as a function of tuner VSWR (tuning range).
All data can either be entered by hand or through measured .S2P files.
In particular the RF Calculator allows you to calculate:
- The VSWR and Rmin (at DUT) for any Fixture insertion Loss and Tuner VSWR.
- The available Tuner+Fixture Loss for any of the above (important for Source Tuner).
- The expected average and worst case measurement error as a function of Fixture and Tuner measurement uncertainty.
- The effect of realistic S-parameters of wafer probes and test fixtures on tuning range and phase.
- The expected average errors in Hot-Cold and Cold noise source measurements as a function of noise power and S-parameter measurement uncertainty.
After you download, extract all files included in the .ZIP file and save them in a Directory of your choice. Then create a shortcut to be able to run RF Calculator from your Desktop1.
Click here to download a free copy of Focus' RF Calculator.
Note 1: If you are a Focus customer you will find the latest RF calculator in WinCCMT (Utility menu).
Calibration File Interpolation
Tuner calibration files (extension .CAL) should be measured for each frequency point!
However, it is possible to interpolate, as far as the frequency difference is not large.
For example it is safe to assume that, if you have a calibration file at 800MHz and one at 850MHz, you will be able to generate, through interpolation, new calibration files at 810, 815 or 843 MHz, to name some examples.
This utility allows you to do so. It supports calibration files for CCMT, PMT and MPT tuners.
In case you need to operate iTuners with interpolated calibration files, you have to upload the newly generated files using iTools.
Interpolated calibration files will rarely be as accurate as directly measured ones. Please use your judgement.
The Interpolation utility can be invoked from WinCCMT.exe in the Utility menu.
IMPORTANT: Before you use this application be sure that the measured calibration files are of the same tuner and calibration conditions (adapters etc..) and include the same number of calibration points.
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