Question
Download Solution PDFTwo silicon diodes with a forward voltage drop of 0.7 V, are used in the circuit shown below. The range of input voltage Vi for which the output voltage Vo = Vi is :
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
Two silicon diodes with a forward voltage drop of 0.7 V are used in the given clipping circuit.
The diodes are arranged such that D1 is connected to a –1 V source and D2 is connected to a +2 V source, with output voltage Vo taken from the junction between the resistor and the two diodes.
We need to find the range of input voltage Vi for which Vo = Vi, i.e., when both diodes are in OFF condition and do not affect the output.
Analysis:
Condition for D1 (left diode) to turn ON:
D1 conducts when anode-to-cathode voltage ≥ 0.7 V.
Anode of D1 is at Vi, cathode is at –1 V.
So,
To keep D1 OFF:
Condition for D2 (right diode) to turn ON:
D2 conducts when cathode-to-anode voltage ≥ 0.7 V.
Cathode of D2 is at Vi, anode is at +2 V.
So,
To keep D2 OFF:
Result:
For both diodes to remain OFF (and hence Vo = Vi), the valid range is:
−1.7 V < Vi < 2.7 VLast updated on Jul 3, 2025
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