For the circuit given below the cut-in voltage of diode

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For the circuit given below the cut-in voltage of diode is
V_γ = 0.7 V. The plot of V₀ versus V_i is:

1. NA
2. NA
3. NA
4. NA

Correct Option: C

ν₀ = ν_i + 15.	1	= ν_i + 5
	(1 + 2)

Cut-in-voltage of the diode, ν_f = 0.7 V
for voltage ν_i ≤ 5.7 the diode will not conduct and ν₀ = ν_i
Let general case when diode is on, then KCL at point A.

ν₀ - ν_i	+	ν₀	+	ν₀ - 15	= 0
1k		1k		2k

V₀		1 + 1 +	1		= V_i +	15
			2			2

V₀		5		= V_i +	15
		2			2

ν₀ = 0·4v_i + 3
Hence alternative (C) is the most closest choice.