Diode-connected transistor

Connecting base and collector turns BJT into diode.

A diode-connected transistor is a method of creating a two-terminal rectifying device (a diode) out of a three-terminal transistor. A characteristic of diode-connected transistors is that they are always in the saturation region for metal–oxide–semiconductor field-effect transistors (MOSFETs) and junction-gate field-effect transistors (JFETs), and in the active region for bipolar junction transistors (BJTs).

A diode-connected transistor is made by connecting

  • the base and collector of a BJT
  • the drain and source of a JFET[1]
  • the gate and drain of a MOSFET

Diode-connected transistors are used in current mirrors to provide a voltage drop that tracks that of the other transistor as temperature changes.[2] They also have very low reverse leakage currents.[3]

References

  1. ^ "Diode-connected fet protects op amps" (PDF). Archived from the original (PDF) on 2013-11-26.
  2. ^ "Usage of a transistor configured as diode".
  3. ^ "Electronic Device and Circuit Theory Electronics: Common Circuit Application(JFET Diode)". 17 March 2009.


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