The key component of a large-signal network analyzer (LSNA) is the downconvertor, which allows the transformation of the measured RF spectrum into an IF spectrum by using the harmonic sampling principle. However, a drawback of the harmonic sampling principle is that, for broadband signals, a "descrambling" of the measured IF spectral components is necessary after downconversion. In this paper, the classical twoport LSNA is adapted to allow direct conversion of broadband signals. The necessary hardware adaptations are explained, and the improved broadband conversion is shown on some significant measurement examples.
|Number of pages||5|
|Journal||IEEE Transactions on Instrumentation and Measurement|
|Publication status||Published - 1 Feb 2009|
- Large-signal analysis
- microwave measurements
- nonlinear measurement system