SFCW Generator Alignment Techniques
STANFORD UNIV CA STANFORD ELECTRONICS LABS
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Depending on the design, synthesized-sweep SFCW generators often have phase discontinuities at certain intervals such as 1 MHz when sweeping over a wider band. In addition, when sweeping repetitively over a small interval such as 100 kHz, the starting phase may not be coherent from one sweep to the next. Undesired phase discontinuities give rise to spurious spectral components and prevent application of MTI techniques. This report discusses modifications and adjustments for minimizing or avoiding phase discontinuities in SFCW exciters of the type first developed at Stanford University. The same approaches should be useful for other exciter designs as well. In addition, a novel oscilloscope display of wide applicability is described, which greatly simplifies both the measurement of phase coherence and the performance of corrective adjustments.
- Electrical and Electronic Equipment