(A) Draw the transfer characteristics of the circuit of figure, assuming both D1 and D2 to be ideal (B) How would the characteristics change if D2 is ideal, but D 1 is no-ideal and has a forward resistance of 10 W and a reverse of infinity.

Question

(A) Draw the transfer characteristics of the circuit of figure, assuming both [latex] D_{1} ext { and } D_{2}[/latex] to be ideal (B) How would the characteristics change if [latex]D_{2}[/latex] is ideal, but [latex]D_{1}[/latex] is no-ideal and has a forward resistance of 10 W and a reverse of infinity.

Accepted Answer

(A) Both the Diodes are ideal whom [latex]V_{0}[/latex] is between 1V to 2V [latex]1 V \leq V _{0} \leq 2 V[/latex] in this case both the diodes [latex]D_{1} ext { and } D_{2}[/latex] are forward bias

1 V and 2 V can not be in parallel and its violation of KVL

So this circuit does not exist.

[latex] ext { (B) } V_{0} \leq 2 V \left(D_{2} f, B ext { and } D_{1} f, B ight)[/latex]

Apply KCL

[latex]\begin{aligned}&I+I_{1}=I_{2}+I_{3} \&\frac{V_{i}-2}{1 k}+I_{1}=\frac{2-1}{10}+\frac{2-0}{1 k} \&i_{1}=\frac{104-V_{i}}{1000} \&i \geq 0 \&\begin{aligned}\frac{104-V_{i}}{1000} & \geq 0 \V_{i} & \leq 104 \V_{i} & \leq 104 V \Rightarrow V_{0}=2 V\end{aligned}\end{aligned}[/latex]

Case 2: [latex]V_{i} \geq 104 V ext {, so } V_{0} \geq 2 V ext { Diode } D_{1}[/latex] is forward bias Diode [latex]D_{2}[/latex] is reverse bias

Apply KCL

[latex]\begin{aligned}\frac{V_{0}-V_{i}}{1 K}+\frac{V_{0}-1}{10}+\frac{V_{0}-0}{1 K} &=0 \V_{0} &=\frac{V_{i}+100}{102}\end{aligned}[/latex]

Question 2.1: (A) Draw the transfer characteristics of the circuit of figu...

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