Measurements | RF Measurements |
Third Order Intercept Measurement
The Third Order Intercept (TOI) measurement computes and displays the output intercept point and places markers on the trace to indicate the measured signals and their
For odd orders, the measurement is done by:
1.Applying 2 tones with a small separation (usually < 1 MHz) and identical amplitudes to the DUT. Note that the signal generator must generate very low levels of interfering signals at the expected location of the distortion components.
2.Measuring the amplitude difference between the applied tones and the distortion components. The distortion components will be at known frequencies, based on the separation of the 2 tones and the order of the distortion.
3.Computing the intercept point. This is the theoretical level where the distortion component would be the same level as the input signal. Since the distortion changes by a known amount with signal level, based on the order, this is a simple computation.
Figure 5-9. Third Order Intercept Measurement
MS278XB OM |
