1 The issue or topic may be set forth as a topical question, a hypothetical incident, a student experience, an actual case, etc. 2  Select panelists who are well informed about and have specific points of view regarding the issue or topic. 3  A panel discussion that includes three to five panelists is usually most workable.
A: Typically, they are constructed with PIN diodes. A PIN diode is simply a p-n junction diode that is designed to. have a very small junction capacitance (0.01 to 0.1 pf). A Sort of the opposite of the varactor diode! To see why this is important, recall diode small signal analysis. from your first electronics course.
It passes current in only one direction. However, at radio frequencies the PIN diode acts very differently from a conventional diode. At radio frequencies, a PIN diode acts as either a small valued capacitor or as a variable resistor, depending on the DC bias applied to the diode. If the diode is reverse biased at DC, at RF it behaves as a very small value capacitor with a capacitance of approximately 1 pf.