Learn about signal diodes, their working principle, types, applications, and differences between silicon and germanium diodes in electronic circuits.
What is a signal diode and how does it work?
A signal diode is a non-linear semiconductor device used primarily in electronic circuits for handling small currents or high frequencies. These diodes play a crucial role in circuits for radios, televisions, and digital logic, where they allow current to flow in only one direction while blocking it in the opposite direction. Construction of a Signal Diode Signal diodes are small two-terminal components that conduct current when forward biased and block current when reverse biased. Unlike larger power diodes, signal diodes such as Point Contact Diodes or Glass Passivated Diodes are physically small and often encapsulated in glass to protect the internal PN junction. Typically, a signal diode has a red or black band marking the cathode terminal. Types of Signal Diodes Signal diodes vary depending on the material used for their construction: Germanium Signal Diodes: These have a low reverse resistance, resulting in a reduced forward volt drop across the junction (usually 0.2 to 0.3 volts), b…
About the author
Prasun Barua is a graduate engineer in Electrical and Electronic Engineering with a passion for simplifying complex technical concepts for learners and professionals alike. He has authored numerous highly regarded books covering a wide range of elec…
