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bias resistor. (electronics). A resistor used in the cathode or grid circuit of an electron tube to provide a voltage drop that serves as the bias. 1  Facebook.2  Twitter. â²bÄ«Â·És riâ²sisÂ·tÉr ]. (electronics). A resistor used in the cathode or grid circuit of an electron tube to provide a voltage drop that serves as the bias. 1  Facebook. 2  Twitter.
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.