Frequency-scalable shockline-based vna

摘要: A high-frequency VNA system is provided using non-linear transmission line (NLTL or shockline) based samplers configured to provide scalable operation characteristics. Scaling adjust noise performance vs. frequency accomplished as follows: (1) increasing decreasing the fall time of a shockline's output voltage waveform. This by changing number Schottky varactors in shockline, well Bragg cutoff setting spacing between varactors; (2) structure pulse-forming network connected with sampler length differentiator arms network; and (3) LO signal applied shockline. Multiple NLTL are multiplexed form broadband reflectometer multiplexing circuitry selectively connecting one segments at allow user selection desired response for each segment.