Analog Circuits Questions and Answers – Parallel Clipper-2

This set of Analog Circuits test focuses on “Parallel Clipper-2”.

1. For the circuit given below, which of the following diagram represent Vout if Vin is the signal shown below? (Use constant voltage drop model of diode and take cut-in voltage as 0.7V)
Figure representing voltage output vout of given circuit
a) The minimum voltage & maximum voltage across diode - option a
b) The minimum voltage & maximum voltage across diode - option b
c) The minimum voltage & maximum voltage across diode - option c
d) The minimum voltage & maximum voltage across diode - option d
View Answer

Answer: a
Explanation: When diode D is forward biased it conducts current and hence voltage drop across is VD.
For positive half cycle of the input diode conducts and Vout becomes VD. The linear portion of the graph is the point where Vin is positive is because up to 0.7V diode will not conduct and input as such appears on output. When diode is reverse bias there is no current through the diode and hence the voltage will be same as that across the resistor which is connected to ground. It is Vinx1k/(1k+1k).
The minimum voltage across it will be -5/2 = -2.5V and maximum voltage at output is 0.7V
In the diagram, red shows input and green shows output
Linear portion of the graph is the point where Vin is positive.

2. For the circuit given below, which of the following diagram represent Vout if Vin is the signal shown below? (Use constant voltage drop model of diode and take cut-in voltage as 0.7V)
Figure representing voltage output vout of given circuit for cut-in voltage as 0.7V
a) Graph of output of forward biased diode & voltage drop across is VD - option a
b) Graph of output of forward biased diode & voltage drop across is VD - option b
c) Graph of output of forward biased diode & voltage drop across is VD - option c
d) Graph of output of forward biased diode & voltage drop across is VD - option d
View Answer

Answer: c
Explanation: When diode D is forward biased it conducts current and hence voltage drop across is VD.
For positive half cycle of the input diode conducts and Vout becomes VD. When diode is reverse bias there is no current through the diode and hence the voltage will be same as that across the resistor which is connected to ground. It is Vinx1k/(1k+1k).
The minimum voltage across it will be -5/2 = -2.5V and maximum voltage at output is 0.7V.

3. For the circuit given below, which of the following diagram represent Vout if Vin is the signal shown below? (Use constant voltage drop model of diode and take cut-in voltage as 0.7V)
Graph & circuit showing voltage output vout using constant voltage drop model
a) Diagram represents Vout if Vin is the signal - option a
b) Diagram represents Vout if Vin is the signal - option b
c) Diagram represents Vout if Vin is the signal - option c
d) Diagram represents Vout if Vin is the signal - option d
View Answer

Answer: d
Explanation: When diode D is forward biased it conducts current and hence voltage drop across is VD.
For negative half cycle of the input diode conducts and Vout becomes VD. When diode is reverse bias there is no current through the diode and hence the voltage will be same as that across the resistor which is connected to ground. It is Vinx1k/(1k+1k).
The maximum voltage across it will be 5/2 = 2.5V and minimum voltage at output is -0.7V
In the diagram, red shows input and green shows output.
Graph showing negative half cycle of the input diode with maximum voltage across
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4. For the circuit given below, which of the following diagram represent Vout if Vin is the signal shown below? (Use constant voltage drop model of diode and take cut-in voltage as 0.7V)
Graph & circuit showing voltage output vout of constant voltage drop model of diode
a) Diagram represents Vout if Vin is the signal across resistor connected to ground - option a
b) Diagram represents Vout if Vin is the signal across resistor connected to ground - option b
c) Diagram represents Vout if Vin is the signal across resistor connected to ground - option c
d) Diagram represents Vout if Vin is the signal across resistor connected to ground - option d
View Answer

Answer: d
Explanation: When diode D is forward biased it conducts current and hence voltage drop across is VD.
For negative half cycle of the input diode conducts and Vout becomes VD. When diode is reverse bias there is no current through the diode and hence the voltage will be same as that across the resistor which is connected to ground. It is Vinx1k/(1k+1k).
The maximum voltage across it will be 5/2 = 2.5V and minimum voltage at output is -0.7V.

5. Find the output voltage for the circuit below. (Use constant voltage drop model of diode and take cut-in voltage as 0.7V)
Find the output voltage across the diode D2 of simple parallel clipper
a) 5v
b) 2v
c) 0V
d) 10v
View Answer

Answer: c
Explanation: In circuit of parallel clipper voltage across the diode D2 will be same as a simple parallel clipper. The output of the circuit is null because the output of diode D2 is negative and diode D will not conduct negative voltage.
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6. For the circuit given below, which of the following diagram represent Vout if Vin is the signal shown below? (Use constant voltage drop model of diode and take cut-in voltage as 0.7V)
Figure & graph showing variation of voltage resistance & diode
a) Diagram represents Vout if Vin is the signal of voltage at node - option a
b) Diagram represents Vout if Vin is the signal of voltage at node - option b
c) Diagram represents Vout if Vin is the signal of voltage at node - option c
d) Diagram represents Vout if Vin is the signal of voltage at node - option d
View Answer

Answer: a
Explanation: The correct answer is the graph between 0 to -4.3V. The parallel diode conducts when voltage at node is greater than 0.7V and then the output is 0V. When the voltage goes less than 0.7V, parallel diode is reverse biased and doesn’t conduct. Voltage is across the output diode but there is a drop of 0.7V across it. So output is VIN – 0.7.

7. For the circuit given below, which of the following diagram represent Vout if Vin is the signal shown below? (Use constant voltage drop model of diode and take cut-in voltage as 0.7V)
Find the output voltage across diodes when voltage 0.7V & sign depends on the cycle
a) Diagram represent Vout if Vin is the signal if diodes in opposite direction - option a
b) Diagram represent Vout if Vin is the signal if diodes in opposite direction - option b
c) Diagram represent Vout if Vin is the signal if diodes in opposite direction - option c
d) Diagram represent Vout if Vin is the signal if diodes in opposite direction - option d
View Answer

Answer: b
Explanation: Here in the circuit since both diodes are in opposite direction both positive and negative cycles will pass through diodes. Since both diodes conduct every time the voltage across diodes will always be 0.7V and sign depends on the cycle.
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8. For the circuit given below, which of the following diagram represent Vout if Vin is the signal shown below? (Use constant voltage drop model of diode and take cut-in voltage as 0.7V)
Circuit & graph showing -5v & +5v voltage with respect to time
a) Diagram represent Vout if Vin is the signal of positive & negative cycles - option a
b) Diagram represent Vout if Vin is the signal of positive & negative cycles - option b
c) Diagram represent Vout if Vin is the signal of positive & negative cycles - option c
d) Diagram represent Vout if Vin is the signal of positive & negative cycles - option d
View Answer

Answer: d
Explanation: Here in the circuit since both diodes are in opposite direction both positive and negative cycles will pass through diodes. Since both diodes conduct every time the voltage across diodes will always be 0.7V and sign depends on the cycle.

9. For the circuit given below, which of the following diagram represent Vout if Vin is the signal shown below? (Use constant voltage drop model of diode and take cut-in voltage as 0.7V)
Find output voltage Vout using star delta conversion of resistors
a) Diagram represent Vout if Vin is the signal by three resistor network - option a
b) Diagram represent Vout if Vin is the signal by three resistor network - option b
c) Diagram represent Vout if Vin is the signal by three resistor network - option c
d) Diagram represent Vout if Vin is the signal by three resistor network - option d
View Answer

Answer: c
Explanation: The circuit can be simplified using star –delta conversion of resistors. The three resistor network can be solved by delta – star equivalent which gives a simplified form as former questions afer solVing star –delta the circuit will look like as follows
Circuit showing three resistor network of star delta conversion of resistors
Hence the circuit is simplified.
When diode D is forward biased it conducts current and hence voltage drop across is VD.
For negative half cycle of the input diode conducts and Vout becomes VD. When diode is reverse bias there is no current through the diode and hence the voltage will be same as that across the resistor which is connected to ground. It is Vinx333.3/(0.33k+1.33k).
The maximum voltage across it will be 0.7V and minimum voltage at output is -1V
In the diagram, red shows input and green shows output.
Red shows maximum voltage of 0.7V & green shows minimum voltage -1V
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Sanfoundry Global Education & Learning Series – Analog Circuits.

To practice all areas of Analog Circuits for tests, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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