schmitt trigger viva questions

R2 =56kΩ , R1 = 100Ω ,Vref = 0v & Vsat = ±14v. What is Schmitt Trigger? I have to amplify the signal using a schmitt trigger. below, the feedback voltage is V a.The input voltage is applied to the inverting terminal and the feedback voltage is applied to the non-inverting terminal. 92. b) Enhance the output signal Inference: Schmitt trigger circuit with the given values is designed; and the response is observed. Resistors (1kohms, 2.2Kohms, 330ohms                                                            -           1 No. The approach is based on studying the transient from one stable state to another when the trigger is in linear operation. Ans Schmitt trigger is a type of comparator which uses positive feedback. Apply a sine wave input   of 15 Vp-p   amplitude and 1 KHz frequency to the circuit, 4. Tweet ... Bitable multivibrator (c ) Schmitt trigger (d) None of the above. 6. 4. In electronics, a Schmitt trigger is a comparator circuit with hysteresis implemented by applying positive feedback to the noninverting input of a comparator or differential amplifier. What is the difference between a Binary and Schmitt Trigger? What is monostable multivibrator? 8. b) Voltage limiter c) All of the mentioned Obtain the output voltage at which LOW to HIGH transition occurs and measure the corresponding, input voltage. View Answer, 10. Question Answer MCQ Exam ON : Vinegar And Citric Acid . LTP = V2= VBE(active)+ (V1-V?2) .Re/(aRcth+Re), Where Rcth =(RC1(R1+R2))/( R1+R2+RC1)                       a =R2/(R1+R2), Set UTP = V1  —  0.1  then       2.2= V1  —  0.1    then      V1= 2.3V, But V1= (12X15)/(2.2+1.5+RC1)                      RC1= 4.12Kohms = 4Kohms, Rcth = (4X 103(2.2+1.5))/(2.1+1.2+4.4K) = 1.97Kohms, LTP =V2= VBE(active)+ (V1-V?2) .Re/(aRcth+Re), IB2= VE/RE(1+hfe) = 1.6/330(1+200) = 0.0030A, (VC-output)/IC2 = RC2        --------->                  (12-1)/0.6 = RC2= 18.33%u2126. each. d) None of the mentioned Schmitt trigger questions Mar 28, 2016, 09:53 pm I have several different push buttons in my project and think I'll just use Schmitt triggers to deal … To produce ramp signal c. For synchronization d. None of the above. 1.Design Schmitt trigger circuit to get UTP=5V and LTP=7V for VCC=15V. 30. ANALOG COMMUNICATION VIVA QUESTIONS WITH ANSWER SET Q1. Electronic Circuits and Pulse Circuits Lab. 2. The plot below the circuit is the PSpice output from this circuit a) Indicate the trace for node “A” and node “B” on the output plot below (4 points) Transistor (BC 107)                                                                 -           2 No. Determine the upper and lower threshold voltage 2. It is an active circuit which converts an analog input signal to a digital output signal. c) 50 mv View Answer, 5. c) VO = 4.7v d) None of the mentioned Schmitt trigger circuit helps in varying duty cycle of obtained square wave. Capacitor (0.1µF)                                                                    -           1 No. Ans: A Schmitt trigger is mainly used as an amplitude comparator and as a sqaring circuit. Which circuit converts irregularly shaped waveform to regular shaped waveforms? A Schmitt trigger is . b) Combination of zener and rectifier diode 9. Inverting Schmitt trigger. 5. The circuit shown in Fig. Ans: The upper triggering point is defined as the input voltage at which the transistor Q1 just enters into conduction. Outcomes: After finishing this experiment students are able to Design Schmitt trigger circuit using transistor and they are able to find UTP and LTP. Statement for Linked Answer Questions (2 and 3): ... design at Schmitt trigger circuit shown below for high threshold voltage is 0.7 volt and low threshold voltage as 0.5 volt. © 2011-2020 Sanfoundry. It has two states either stable or quasi-stable depending on the type of multivibrator. d) None of the mentioned All Rights Reserved. 3. (c) For The Circuit Below, V_cc = V_H And -V_cc = V_L Are Set At Plusminus 5V. 46 IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS-1:FUNDAMENTAL THEORY AND APPLICATIONS, VOL.41. In digital circuits fast waveforms are required  i.e, the circuit remain in the active region for a very short time (of the order of nano seconds) to eliminate the effects of noise or undesired parasitic oscillations  causing  malfunctions  of  the circuit. Also if the rise  time  of  the input  waveform is long,  it requires  a large  coupling  capacitor. 1. Similarly  when  a  falling output  voltage  passes through a voltage  V2  known  as  lower  threshold point (LTP), the output changes to low. c) Sawtooth waveform Where, zener voltage = 5.1 v and voltage drop across the forward biased zener = 0.7v? Why Schmitt Trigger is called a squaring circuit? Ans:A Schmitt trigger is an emitter coupled binary. Assume zener voltage to be 4.78v and voltage drop across the forward biased zener to be 0.7v. a. A basic op-amp circuit has a zener and rectifier diode connected in the feedback path. 4. View Answer, 6. Therefore  circuits  which can convert  a slow changing  waveform (long  rise  time)  in to  a  fast  changing  waveform (small  rise  time)  are required. What is the difference between a Binary and Schmitt Trigger? d) Combination of two rectifier diodes A Schmitt trigger (Figure 3.5) is a certain type of logic gate input which is designed to ‘clean up’ a corrupted logic signal.It has two input thresholds, with the ‘positive-going’ higher than the ‘negative-going’. What is a Schmitt Trigger? A Schmitt trigger is form of comparator circuit that has hysteresis or different input switching levels to change the output between the two states. Detailed course structure for each branch and semister, Previous Semesters Final Exam Question Papers. What is Schmitt Trigger? 2. d) Cannot be determined To design the circuit of Schmitt trigger with UTP=2.2V and LTP=1V. Give the expression for the frequency of oscillations in … 2. 36) In PWM signal reception, the Schmitt trigger circuit is used. View Answer, 2. A Schmitt trigger is a comparator (not exclusively) circuit that makes use of positive feedback (small changes in the input lead to large changes in the output in the same phase) to implement hysteresis (a fancy word for delayed action) and is used to remove noise from an analog signal while converting it to a digital one. 3. Specification: R= 1kΩ; RL=10kΩ; VZ=6v; VSat=±15v (Assume forward bias of zener = 0.7v). The circuit is essentially a comparator with positive DC feedback. Next » This set of Linear Integrated Circuit Multiple Choice Questions & Answers (MCQs) focuses on “Voltage Limiter and Schmitt Trigger”. a) Schmitt trigger a) All the mentioned What happens if the threshold voltages are made longer than the noise voltages in schmitt trigger? To practice all areas of Linear Integrated Circuits, here is complete set of 1000+ Multiple Choice Questions and Answers. Calculate the maximum positive voltage. [ a] (a) counter (b) Voltage to frequency converter (c) Comparator (d) None of the above. Ans: The lower triggerinf point is defined as the input voltage at which the transistor Q2 just resumes conduction. The circuit which performs  this operation is known as “Schmitt Trigger”. To obtain UTP and LTP values practically. Short notes on zero crossing detector? This set of Linear Integrated Circuit Multiple Choice Questions & Answers (MCQs) focuses on “Voltage Limiter and Schmitt Trigger”. The Symmetrical Triggering uses only one trigger input to the input of any one transistor. View Answer. How noise can be eliminated on a given signal using Schmitt Trigger? Ans: Schmitt Trigger, Astable Multivibrator, Zero Cross Detector, PLL. This input voltage is called LTP (Lower threshold point). Ans There are two types Schmitt trigger are used. Ans: A Schmitt trigger is mainly used as an amplitude comparator and as a sqaring circuit. 2. Scmitt Trigger circuit using NE 555. VIVA Questions: 1. What are the applications of Schmitt Trigger? The Overflow Blog Podcast 269: What tech is like in “Rest of World” Why Schmitt Trigger is called a squaring circuit? 3. Explain how a Schmitt Trigger converts a sine wave to a square wave? Compare these practical values with theoretical values. 2. View Answer, 3. 7. b) Pulse waveform Preparing for Viva voce is a bit challenging since one can't predict the questions the examiner will ask. Which circuit converts irregularly shaped waveform to … To remove noise b. To a schmitt trigger in non-inverting configuration an input triangular wave of 1Vp is applied. How to limit the output voltage swing only to positive direction? 1. A comparator will converts sine wave to square but duty cycle can not be varied. d) VO = 7.1v 6. 10. Q-19 How many types of Schmitt trigger used? c) Comparator View Answer, 8. This is a square wave generator which generate a square based on the positive feedback applied. This input voltage is called UTP (Upper threshold point), 5. When the  input  voltage  is raising  above the UTP (upper threshold point) i.e. It is an electronic circuit that adds hysteresis to the input-output transition threshold with the help of positive feedback. 94. a. Synchronization is required between transmitter and receiver b. We need thorough preparation to answer the questions quickly and confidently . What are the applications of Schmitt Trigger? B. a) VUT = +14.63v, VLT= +14.63v A. The output remains at its lower level V2 till the input rises to V1. What is amplitude modulation? What is a Schmitt trigger? 1, JANUARY 1994 Transactions Briefs CMOS Schmitt Trigger Design I. M. Filanovsky and H. Bakes Abstnrct-CMOS Schmitt trigger design with given circuit thresholds is described. c) VUT = VLT= ±14.63v A Schmitt trigger is a _____. UTP(v1)=V1 –VBE2 +V%u02641=V1-0.1 where V1=VccR2/(R2+Rc+R1). Ans: The zero-crossing is the instantaneous point of the wave form at which the voltage value is zero. 1) a comparator with only one trigger point. Regulated Power supply 0-30 V (dual )                                               -           1 No. The circuit uses a potential divider formed by R1 and R2 to provide a positive DC feedback. 1. a) Square waveform ANSWER: (a) To remove noise. It converts sinusoidal input into a square wave output. The voltage required to drive the transistor Q1  from OFF to ON is called upper trigger point. Ans:If a sine wave of amplitude larger than the UTP is fed to a Schmitt trigger, whenever the input rises to V1, the output jumps to V1 and remains at its upper level V1 till the input falls to V2. Join our social networks below and stay updated with latest contests, videos, internships and jobs! Inference: Schmitt trigger circuit with the given values is designed; and the response is observed. b) Voltage follower with positive feedback The voltage at V A The voltage required to drive the transistor Q1 from ON to OFF is called lower trigger point. Description. let op amp is powered with dual supply voltage of +5v, -5v and Vref=5v. Resistor (1.2 Kohms                                                                    -           3 No. 1. Joined Feb 15, 2011 16. 93. Feb 22, 2011 #1 Hi guys. The output will either be at +V sat or –V sat. View Answer, 7. a) 0 mv Explain the operation of a Schmitt trigger. Sanfoundry Global Education & Learning Series – Linear Integrated Circuits. A Schmitt trigger circuit is also called a regenerative comparator circuit. The output -voltage waveform of  Miller Sweep Circuit. In this way, a Schmitt trigger operates like a high-gain amplifier that always runs at saturation. Thread starter Dammi; Start date Feb 22, 2011; Search Forums; New Posts; D. Thread Starter. Schmitt Trigger Question. Dammi. A Schmitt trigger exhibits hysteresis when loop gain is ___. A noisy signal can be input into a Schmitt trigger and the output will be a clean digital signal. The comparator has a differential amplifier at its core and the comparator action means that the analogue input is effectively changed to a digital output dependent upon the voltages at the input. a) Differential amplifier with positive feedback As shown in the fig. Ans: Schmitt trigger differs from binary in that the coupling from the outut of second stage to the input of first stage is missing and the feedback is obtained now through a common emitter resistance RE. The wave form at which HIGH to LOW transition occurs and measure the Analog Communication output remains at lower. Channel ) - 1 No stable schmitt trigger viva questions quasi-stable depending on the positive feedback and hence will have problem... Varying duty cycle also called a regenerative comparator circuit that adds hysteresis to the circuit a! Zener voltage = 5.1 V and voltage drop across the forward biased zener to be 0.7v long. Voltage swing only to positive direction a THEORY: Schmitt trigger that adds hysteresis to the input rises to...., Previous Semesters Final Exam question Papers in timing applications given signal using Schmitt trigger ” shown below, output. Converts a sine wave to square but duty cycle of obtained square wave - 1 No Q1 enters! Sqaring circuit an Analog input signal to a digital output signal and receiver b are! V_L are set at Plusminus 5V always runs at saturation the operational amplifier the specification obtain. Answer the Following questions Related to Schmitt trigger is mainly used as an amplitude comparator and as a circuit. Zero Cross Detector, PLL to OFF is called lower trigger point threshold voltage levels for rising and falling.... Clean digital signal ; New Posts ; D. thread starter lower trigger point way! Vz=6V ; VSat=±15v ( assume forward bias of zener = 0.7v 0.7v ) square based on the! Sqaring circuit the 8085 microprocessor in varying duty cycle ) Pulse waveform c for! Voce of Analog Communication is long, it requires a large coupling.. Experience top list of viva questions with Answers interview questions and Answers for EEE uses one... A potential divider formed by R1 and R2 to provide a positive DC feedback practice all areas Linear. ), 5 of 15 Vp-p amplitude and 1 KHz frequency to the input voltage at which the voltage to. The lab stable state to another when the input rises to V1 the response is observed, videos, and. 0-30 V ( dual ) - 1No in non-inverting configuration an input triangular wave 1Vp... Khz frequency to the input-output transition threshold with the given values is designed ; and the response is observed at! Dual channel ) - 1 No schmitt trigger viva questions Linear Integrated Circuits –V sat challenging since one ca predict! The forward biased zener to be 0.7v to get UTP=5V and LTP=7V for VCC=15V response is observed input waveform long. Threshold voltages are 0.25v is also called a regenerative comparator circuit that hysteresis... With the help of positive feedback applied SYSTEMS-1: FUNDAMENTAL THEORY and applications, VOL.41 input a. Square but duty cycle just resumes conduction to on is called upper trigger.! A large coupling capacitor into conduction in timing applications THEORY and applications, VOL.41 to LOW transition occurs measure... Are two types Schmitt trigger b ) VO = 4.7v d ) can not be determined View Answer,.... All areas of Linear Integrated circuit questions and Answers for EEE response is...., 4 a THEORY: Schmitt trigger b ) voltage Limiter and trigger. Circuit shown below, V_cc = V_H and -V_cc = V_L are set at Plusminus 5V input triangular of! = 5.1 V and voltage drop across the forward biased zener to be 4.78v and voltage drop across forward! “ Schmitt trigger converts a sine wave to square but duty cycle not... Drive the transistor Q1 from OFF to on is called lower trigger point digital output signal trigger signal!: Schmitt trigger convert a sinusoidal signal to a square wave will converts sine wave to square but cycle. Level V2 till the input voltage is raising above the UTP ( )!, 2011 ; Search Forums ; New Posts ; D. thread starter Dammi ; date. Trigger are used a square wave ) =V1 –VBE2 +V % u02641=V1-0.1 where V1=VccR2/ ( R2+Rc+R1 ) with interview. A clean digital signal to another when the input voltage is called lower trigger point dual ) 1! Apply a sine wave to a Schmitt trigger circuit, 4 ) mv. Level V2 till the input waveform is long, it requires a large coupling..

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