The acquisition of negative resistance takes place in UJT in the regenerative process when
The acquisition of negative resistance takes place in UJT in the regenerative process when________
a. Both VE & IE increases
b. Both VE & IE decreases
c. VE increases & IE decreases
d. VE decreases & IE increases
Correct Answer: d. VE decreases & IE increases
When emitter voltage becomes exactly equal to peak voltage, the current (Ip ) flows through the resistance to ground causing the UJT to get turned ON.
It is obvious that as VE & IE rises beyond current, the values of base resistance and intrinsic stand-off ratio decreases.
Thus, the process becomes more regenerative by further reduction in emitter voltage since emitter current increases.
With an increase in emitter current , the emitter voltage decreases. Due to this, UJT possesses negative resistance .
Furthermore ,the consequences shows variations when UJT is in saturation mode beyond the valley point and therefore, emitter voltage increases.