Monday, 15 June 2015

How negative resistance feature of Tunnel Diode is used in oscillators?


How is the negative resistance feature of Tunnel Diodes used in oscillators with the help of this circuit diagram.


Schematic



Answer



If we short the diode for a bit, you can see that we have a regular LC circuit with some voltage applied; it will oscillate normally, but it will suffer from damping - because of Rp -and the oscillation will stop after a while. Now if we add the diode, the negative resistance will cancel Rp and the oscillation will be sustained. R1 and R2 voltage divider keeps the diode biased in the negative resistance region.


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