Interview Questions.

Question 1. If Output Is Measured Between Two Collectors Of Transistors, Then The Differential Amplifier With Two Input Signal Is Said To Be Configured As?

Answer :

When  enter alerts are carried out to base of transistor, it's far stated to be Dual Input. When both creditors are at same DC potential with respect to ground, then it's far said to be Balance Output.

Question 2. A Differential Amplifier Is Capable Of Amplifying?

Answer :

Direct connection among levels eliminates the lower cut off frequency imposed by using coupling capacitor; therefore it is able to enlarge both AC and DC sign.

Embedded Systems Interview Questions
Question 3. Which Is Not The Internal Circuit Of Operational Amplifier?

Answer :

Clamper is an external circuit related on the output of Operational amplifier, which clamp the output to desire DC level.

Question 4. The Purpose Of Level Shifter In Op-amp Internal Circuit Is To?

Answer :

The advantage levels in Op-amp are direct coupled. So, degree shifter is used for adjustment of DC stage.

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Question five. How A Symmetrical Swing Is Obtained At The Output Of Op-amp?

Answer :

For instance, don't forget a single voltage supply +15v. During advantageous 1/2 cycle the output might be +5v and -10v throughout poor half of cycle.

Printed Circuit Board Design (PCB) Interview Questions
Question 6. What Is The Purpose Of Differential Amplifier Stage In Internal Circuit Of Op-amp?

Answer :

Any undesired noise, common to both of the input terminal is suppressed via differential amplifier.

Question 7. What Will Be The Emitter Current In A Differential Amplifier, Where Both The Transistor Are Biased And Matched? (anticipate Current To Be Iq)

Answer :

Due to symmetry of differential amplifier circuit, cutting-edge IQ divides similarly via both transistors.

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Question 8. Change In Value Of Common Mode Input Signal In Differential Pair Amplifier Make?

Answer :

In differential amplifier because of symmetry, both transistors are biased and coupled. Therefore, Voltage at every collector may be identical.

Question nine. How Are The Arbitrary Signal Represented, That Are Applied To The Input Of Transistor?

Answer :

In sensible state of affairs, arbitrary signal are signal are represented as Sum and Difference of not unusual mode sign and differential mode sign.

Hardware layout Interview Questions
Question 10. How The Differential Mode Gain Is Expressed Using ‘h’ Parameter For A Single Ended Output?

Answer :

Formula for differential mode advantage the use of ‘h’ parameter model for a unmarried ended output.

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Question eleven. To Increase The Value Of Cmrr, Which Circuit Is Used To Replace The Emitter Resistance Re In Differential Amplifier?

Answer :

Constant present day bias offers extraordinarily massive resistor below AC circumstance and as a result offer high CMRR fee.

Analogue electronics Interview Questions
Question 12. What Is The Purpose Of Diode In Differential Amplifier With Constant Current Circuit?

Answer :

The base emitter voltage of transistor (VBE) in constant present day circuit with the aid of 2.5mv/oc, thus diode also has identical temperature. Hence  variations cancel each other and general modern IQ grow to be in depend of temperature.

Embedded Systems Interview Questions
Question thirteen. How To Improve Cmrr Value?

Answer :

For a big CMRR cost, ACM have to be small as viable.

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Question 14. Define Total Current (iq) Equation In Differential Amplifier With Constant Current Bias Current?

Answer :

The equation for total present day is acquired via applying Kirchhoff’s Voltage Law to constant modern circuit in differential amplifier.

Question 15. A Widlar Current Source Is Used?

Answer :

In the widlar contemporary source Re is brought to emitter lead of transistor, which consequently effects in smaller output contemporary cost.

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Question 16. Which Current Source Exhibits A Very High Output Resistance?

Answer :

The output resistance of Wilson current replicate is drastically more than ≅(β× Output resistance)/2 than Simple or Widlar modern source.

Question 17. What Will Be The Overall Gain In Darlington Circuit, If The Individual Transistor Gain Is two hundred?

Answer :

Overall cutting-edge advantage, β= β1×β2 (Multiplication of present day gain of individual transistor)

⇒ β=200×2 hundred=40000

Physical Design Engineer Interview Questions
Question 18. To Increase The Input Resistance In Differential Amplifier, Replace The Transistor By?

Answer :

Higher fee of input resistance can be obtained through using Darlington pair in place of transistor.

Printed Circuit Board Design (PCB) Interview Questions
Question 19. What Is The Drawback In Using Darlington Pair In Differential Amplifier?

Answer :

Due to cascaded stage, Darlington differential amplifier offers higher offset voltage which is  times larger than regular  transistor used in differential amplifier.

Question 20. Determine The Amount Of Shift Happens In Level Shifter?

Answer :

Level shifter is largely a easy kind emitter follower. Hence, degree shifter additionally act as a buffer to isolate high gain stages from the output stage. Therefore, the amount of shift received is

VO – Vi = -VBE = -0.7v.

Digital Signal Processing Interview Questions
Question 21. Why Active Load Is Used In Amplifier To Obtain Large Gain In Intermediate Stage Of Amplifier?

Answer :

To boom advantage usually huge collector resistance fee as advantage is proportional to load resistor. However, because of challenge of most fee load resistor, active masses are used in amplifier to gain massive advantage in intermediate levels of amplifier.