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2 GHz Active Probe
Students, hobbyists, and professionals today enjoy unprecedented access to powerful and affordable test equipment for understanding and building electronic projects. But as enthusiast projects have become more advanced and ambitious, it is still possible to hit the limits of entry-level equipment.
Rev C incorporated minor optimization to PDN components and a redesign of the input network to use fixed frequency compensation capacitors, while making low-frequency attenuation trimmable. The evaluation board provided a means to test the hypothesis: the frequency compensation capacitor is a trimmer for easy tuning, and I could interpose a length of poor cable and see if the result matched the chart. When I adjusted the frequency compensation and added a section of RG178 (a thin type of coaxial cable only suitable for short runs), the response demonstrated a similar peaking shape.
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