Q. 16

Find the values of rp, μ and gm of a triode operating at plate voltage 200 V and grid voltage –6 V. The plate characteristics are shown in figure.



Answer :

The dynamic resistance of triode is defined as,


where ΔVp is the change in plate voltage and Vg is the grid voltage and ΔIp is the change in plate current


From figure, considering the line Vg=-6 V, we get two value of VP i.e.


VP1=160 V , VP2=240 V , Also ip1=3 mA ip2=13mA


Substituting values in equation we get,



The mutual inductance gm of a triode valve is defined as



Considering two points in the graph where Vp=200 V we get ip1=13 mA ip2=3mA Vg1=-4 V, Vg2=-8 V


Substituting values in equation we get.




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