PIN diodes are sometimes designed for use as input protection devices for top-frequency exam probes along with other circuits. If your enter sign is little, the PIN diode has negligible influence, presenting only a little parasitic capacitance. Unlike a rectifier diode, it doesn't present a nonlinear resistance at RF frequencies, https://chancegcwrj.aboutyoublog.com/38205514/details-fiction-and-low-noise-amplifier