# What is Sample and hold circuit ?

Sample and hold circuit is the important part of data converters (ADC and DAC). Sample and hold circuit is also called as track-and-hold circuit. Sample and hold circuit is use for sampling of analogue signals and storing its value for some time. Sample and hold circuit basically uses an analogue switch (like JFET) and capacitor.

## Related questions

Description : Define Sample and hold period with reference to S/H circuit.

Answer : Sample Period:- The time period during which the voltage across the capacitor is equal to the input voltage is called sample period. Hold Period:- The time period during which the voltage across the capacitor is constant is called hold period.

Description :

Answer : Sample-and-hold circuit is a device with a mode control switch that causes reading the input at the instance of the trigger and maintaining that value until the next trigger pulse.

Description : Magnetic Circuit and its Analysis

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Description : Describe the difference between an open circuit and a short circuit.

Answer : Open circuit means the wire is cut meaning power will not flow and close circuit means wire is not cut and hence power will flow.Short circuit is the same as close circuit

Description : In a sample-and-hold circuit, the aperture time is (A) time required following a sample (B) time required for the switch to open (C) transition time interval between sample and hold (D) time from the hold command to the opening of the switch

Description : Explain the function of sample and hold circuit by using op-amp.

Answer : sample and hold circuit by using op-amp The n-channel MOSFET is driven by a control voltage VC acts as a switch. The control voltage VC is applied to the gate of the MOSFET ... called sample period. The time period during which the voltage across capacitor is constant is called Hold period.

Description : Explain with neat circuit diagrams the procedures to perform no load and blocked rotor tests on three phase induction motor.

Description : What is unilateral and bilateral circuit?

Answer : Unilateral Circuit: If the characteristic (response or behavior) of circuit depends on the direction of flow of current through its elements, then the network is called as a unilateral network.  ... the direction of current through its elements, then the network is called as a bilateral network.

Description : What is the RMS voltage in a series RL circuit, if the voltage across R and L is 256 V and 192 V respectively? A) 320 V B) 448 V C) 64 V D) None of these

Answer : What is the RMS voltage in a series RL circuit, if the voltage across R and L is 256 V and 192 V respectively? A) 320 V B) 448 V C) 64 V D) None of these

Description :

What is electrical circuit ?

Answer : An electric circuit is the interconnection of electrical elements. Electrical elements like battery, lamp, wire etc.

Description : Consider a circuit with three parallel branches connected across a DC supply. What is the ratio of the branch currents I1 : I2 : I3 if the branch resistances are in the ratio of 2 : 3 : 4 respectively? A) 2 : 3 : 4 B) 6 : 4 : 3 C) 4 : 3 : 2 D) None of these

Answer : Consider a circuit with three parallel branches connected across a DC supply. What is the ratio of the branch currents I1 : I2 : I3 if the branch resistances are in the ratio of 2 : 3 : 4 respectively? A) 2 : 3 : 4 B) 6 : 4 : 3 C) 4 : 3 : 2 D) None of these

Description : What is a clipping circuit?

Description : What is a diode clamper circuit?

Answer : Tha faction of diode

Description :

What is the use of diode in the circuit?

Answer : Diode is a device which allows the flow of current in one direction and blocks the current in opposite direction.

Description : What is the use of a thyristor in a circuit?

Description :

What is the power factor of purely resistive circuit.

Answer : Unity that is 1

Description : What is the role of a capacitor in a circuit?

Description : What supplies energy to move through a circuit?

Answer : A  potentiall  diffrence  provides  sunction  pressure.

Description : What is the direction of flow of electric current in an electric circuit?

Answer : It  flows  from  anode  to  cathode  (direction  of   holes  flow)

Description : What is a node in an electrical circuit?

Answer : a positively charged electrons

Description :

What is mesh in circuit theory?

Answer : A mesh is barrier made of conneticonstrands of metal fiber or other flexible or ductile materials

Description : What is digital circuit design?

Description : What is electronic circuit design?

Description : What is the frequency response of a circuit?

Description : What does it mean to analyze a circuit?

Description : What is DC analysis of a circuit?

Description : What is the analog circuit?

Description : What can cause a short circuit?

Description : What is the maximum number of circuit breakers in a panel?

Answer : It depends on that which type of panel is this.

Description :

Answer : When the total impendance equals  supply frequency.

Description : What is the purpose of a capacitor in an AC circuit?

Answer : Every AC supply is not ideal AC it contains DC component so to provide restriction to DC component in supply we have to use Capacitor

Description : what is SF6 circuit breaker?

Answer : A circuit breaker in which SF6 under pressure gas is used toextinguish the arc is calledSF6 circuit breaker. SF6 (sulphur hexafluoride) gas has excellent dielectric , arc quenching, chemical and other physical properties and has proved its ...

Description :

Answer : Integrated circuit design for particular application is known as Application Specific Integrated Circuit ASIC. ASIC have smaller size, less power consumption and less cost .

Description : What is drive circuit in power electronics?

Answer : Driver is used for Motion Control through the use of power electronics.

Description :

Answer : In short circuit test of transformer the low voltage side is short circuited . On high voltage side the voltmeter is connected in parallel and ammeter in series and also a wattmeter is ... circuit test is done for determining impedance and losses. In this test iron losses is neglected.

Description : Sample -and -hold circuits in ADCs are designed to : - a) sample and hold the output of the binary counter during the conversion process b) stabilize theAD Cs threshold c) voltage during the conversion process stabilize the input analog d) signal during the conversion process sample and hold the ADC staircase waveform during the conversion process

Answer : Sample -and -hold circuits in ADCs are designed to : - voltage during the conversion process stabilize the input analog

Description : Draw the circuit diagram of battery charger using SCR and explain it’s working.

Answer : Battery charger circuit using SCR: The figure shows the battery charger circuit using SCR. A 12V discharged battery is connected in the circuit and switch SW is closed. The singlephase 230V ... not fired. In this way, after full charging, further charging is automatically stopped.

Description : Define active circuit and passive circuit.

Answer : Active circuit: Active Circuit is one which contains at least one source of e.m.f. or energy, is called active circuit.  Passive Circuit: Passive Circuit is one which does not contain any source of e.m.f. or energy in it, is called passive circuit.

Description :

Answer : Req= (1/1200 +1/560 + 1/2.1)^-1        = 2.1 ohms RT= 2.1 + 7.8      = 9.9 ohms IT = V/R = 24/9.9                = 2.4 A Veq= R I =  2.1 2 ... 7.8         = 12.096 w                 = 44.928 w _________________________________________ By: Ellis-Junior Kamatjipose [email protected]

Description : Compare combinational logic circuit and sequential logic circuit

Answer : Combinational logic Sequential logic The combinational logic circuit consists of logic gate only Sequential logic circuit consists of combinational logic circuit along with memory for storage of ... , multiplexer, demultiplexer etc E.g. counters, shift registers flip-flop etc

Description : State function of starter and ELCB. (Earth Leakage Circuit Breaker)

Answer : i) Function of Starter:- 1. To prevent the high starting current OR to minimize the starting current. 2. To give supply failure protection 3. To give over load and short circuit protection ... an installation and cut off the circuit from power supply and avoid electrical shock to the person.

Description : Mention the precautions to be taken while connecting CT and PT in the circuit.

Answer : Precautions to be taken while using instrument transformers: 1. Secondary of CT is never kept open circuited when it is energized. 2. Secondary of PT is never kept short circuited when it ... of the instrument transformers unless they are properly grounded. 8. Never connect to DC circuits.

Description : Define balanced and unbalanced load in three phase circuit.

Answer : Balanced Load: When all the imedances of 3 phases are equal in magnitude and of same nature then load is said to be balanced.  Unbalanced Load: When all the imedances of 3 phases are not equal in magnitude and of different nature then load is said to be unbalanced.

Description : Draw the circuit diagram of crystal oscillator and explain its working.

Answer : To excite a crystal for operation in the series-resonant mode it may be connected as a series element in a feedback path, the crystal impedance is the smallest and the amount of positive feedback is the largest. ... which is good.  The resonant frequency is given as  Fo = 1/( 2 π √LC )

Description : Draw and explain Hartley Oscillator circuit diagram.

Answer : Function of each component: 1. An NPN transistor connected in a common emitter configuration works as the active device in amplifier stage and CE configuration provides 180°phase shift. 2. R1 and R2 ... circuit to the base-emitter circuit.  The frequency of oscillation is given as-

Description : State and explain Ohm's law for magnetic circuit.

Answer : Ohm's law for electric circuit is V = I R where V is voltage, I is current, R is Resistance. Ohm's law for magnetic circuit is MMF = Φ X S where MMF is magnetomotive force (NI) ... . Resistance is the opposition to the flow of current while reluctance is the opposition to the flow of magnetic flux.

Description : Compare electric and magnetic circuit.

Answer : Comparison between Magnetic and Electric Circuits

Description : Draw a typical electric circuit including ammeter and voltmeter.

Answer : The figure shows typical electric circuit including ammeter and voltmeter. Ammeter is connected in series for measurement of current. Voltmeter is connected in parallel for measurement of voltage. Fuse is use ... are used. If the electric supply is DC the DC ammeter and DC voltmeter are used.

Description : A series R-L-C Circuit has a resonant frequency of 1000 Hz. If the values of R, L and C are doubled, the new resonant frequency is

Answer : A series R-L-C Circuit has a resonant frequency of 1000 Hz. If the values of R, L and C are doubled, the new resonant frequency is 500 Hz

Description : In an ac series RLC circuit, the voltage across R and L is 20 V; voltage across L and C is 9 V and voltage across RLC is 15 V. What is the voltage across C?

Answer : In an ac series RLC circuit, the voltage across R and L is 20 V; voltage across L and C is 9 V and voltage across RLC is 15 V. What is the voltage across C? 7 V

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