When the initial slope of input sine wave is greater than the slew rate of an OPAMP, the output: Approaches to triangular waveshape
Description : An OP amp has a slew rate of 1V/µs. At a signal frequency of 0.1 MHz, the maximum undistorted sine wave amplitude is (a) 8V (b) 4.82 V (c) 2.02 V (d) 1.592 V
Last Answer : Slew rate = 2πfv where v is the amplitude V=(1/2π*0.1) = 1.592V
Description : The purpose of a 'slew rate controller' in a circuit such as shown in the illustration is to ______________. EL-0096 A. limit the rate of change of a signal B. introduce a 'live zero' ... linear input into a non-linear output D. reduce air pressure to a value required by a combination circuit
Last Answer : Answer: A
Description : Why the input resistance of an ideal OPAMP is infinite and output resistance is zero? secondly, how can we measure these resistances(input and output) in case of an ideal OPAMPand Real OP-AMP in the following conditions when 1- load is not connected. 2- load is connected.
Last Answer : Ans- Ideal OP-AMP is a power ful concept. If one goes through the history of amplifying devices it becomes clear that less it loads the previous stage better the output signal. ie ... . Can refer application notes by device manufacturer available in internet for more precise and practical solutions.
Description : Which portion of a sine-wave input is retained in the output of a series-negative limiter?
Last Answer : Positive.
Description : Which portion of a sine-wave input is retained in the output of a series-positive limiter?
Last Answer : Negative.
Description : Define each of following terms of operational amplifiers i) Slew rate ii) Input offset voltage iii) Voltage gain iv) Input capacitance
Last Answer : i) Slew rate:- Maximum rate of change of o/p voltage per unit of time. It is express in volt/µsec. ii) Input offset voltage:- The voltage that must be applied between two ... capacitance that can be measured at either be inverting or non-inverting terminal with other terminal connected to ground.
Description : An amplifier without feedback has a voltage gain of 50, input resistance 1kΩ and output resistance of 2.5kΩ. The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback factor of 0.2 would be: (1) 1/11 kΩ (2) 1/5 kΩ (3) 5 kΩ (4) 11 kΩ
Last Answer : An amplifier without feedback has a voltage gain of 50, input resistance 1kΩ and output resistance of 2.5kΩ. The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback factor of 0.2 would be: 1/11 kΩ
Description : When sine wave is given as input to Schmitt trigger then its generates a) Sine wave b) Saw tooth wave c) Triangle wave d) Square wave
Last Answer : Ans: Square wave
Description : In the inverting configuration, what is the voltage (for all practical purposes) at the inverting input to the operational amplifier if the input signal is a 1-volt, peak-to-peak sine wave?
Last Answer : 0 volts.
Description : When sine wave is given as input to Schmitt trigger then it generates : (A) Sine wave (B) Saw tooth wave (C) Triangle wave (D) Square wave
Last Answer : When sine wave is given as input to Schmitt trigger than it generates Square Wave
Description : If a transformer primary is energised from a square wave voltage source, its output voltage will be (A) A square wave. (B) A sine wave. (C) A triangular wave. (D) A pulse wave.
Last Answer : (A) A square wave.
Description : A sine wave of 15 kHz is changing at a faster rate than a sine wave with a frequency of? B.12 kHz C.18 kHz D.1.3 MHz
Last Answer : A sine wave of 15 kHz is changing at a faster rate than a sine wave with a frequency of? B.12 kHz C.18 kHz D.1.3 MHz
Description : If a gauge is installed perpendicular to the slope, its measurement is reduced by multiplying (A) Sine of the angle of inclination with vertical (B) Cosine of the angle of inclination with vertical (C) Tangent of the angle of inclination with vertical (D) Calibration coefficient of the gauge
Last Answer : Answer: Option B
Description : An amplifier operating over the frequency range from 18 to 20 MHz has 10 kilo ohm input resistor. What is the r.m.s. noise voltage at the input to this amplifier if the ambient temperature is 27o C
Last Answer : An amplifier operating over the frequency range from 18 to 20 MHz has 10 kilo ohm input resistor. What is the r.m.s. noise voltage at the input to this amplifier if the ambient temperature is 27o C 18.2 microvolt
Description : Negative feedback amplifier has a signal corrupted by noise as its input. The amplifier will (A) Amplify the noise as much as the signal (B) Reduce the noise (C) Increase the noise (D) Not effect the noise
Last Answer : Negative feedback amplifier has a signal corrupted by noise as its input. The amplifier will Reduce the noise
Description : The input impedance of an op-amp is • High • Low • Medium • None of the above
Last Answer : The input impedance of an op-amp is High
Description : The initial response when the output is not equal to input is called?
Last Answer : The initial response when the output is not equal to input is called Transient response.
Description : For a feedback amplifier, if the loop gain is much greater than unity, the closed loop gain will be equal to
Last Answer : For a feedback amplifier, if the loop gain is much greater than unity, the closed loop gain will be equal to inverse of feedback factor
Description : What is Slew Rate ? What is the sleeve rate ?
Last Answer : : Sluw rate is how fast the output of an Op-amp can change.
Description : What are the methods to improve slew rate?
Last Answer : a. The slew rate can be improved with higher closed-loop gain and dc supply voltage. But the slew rate also varies with temperature. i.e., slew rate decreases with increase in temperature. b. Another ... a higher slew rate, op-amp should have either a higher current or a small value of capacitor.
Description : How can the slew rate be made faster?
Last Answer : The slew rate can be made faster by having a high charging current or a small capacitance value.
Description : Define slew rate?
Last Answer : Slew rate can be defined as the maximum rate of change of output voltage of op-amp with respect to time.
Description : An infinite slew rate refers to A. no time delay B. small time delay C. large time delay D. variable time delay
Last Answer : no time delay
Description : What causes slew rate?
Last Answer : There is a capacitor with-in or outside of an op-amp to prevent oscillation. The capacitor which prevents the output voltage from responding immediately to a fast changing input.
Description : Define slew rate.
Last Answer : The slew rate is defined as the maximum rate of change of output Voltage caused by a step input voltage.An ideal slew rate is infinite which means that op-amp’s output voltage should change instantaneously in response to input step voltage.
Description : Define : (i) CMMR ii) Slew rate
Last Answer : (i) CMRR:- The CMRR is defined as the ratio of the powers of the differential gain over the common-mode gain, measured in positive decibels (thus using the 20 log rule): As differential gain should ... respond to an abrupt change of input level It is measured as a voltage change in a given time.
Description : Slew rate is defined by: (1) di/dt(max) (2) dv/dt(max) (3) di/dt(min) (4) dv/dt(min)
Last Answer : Slew rate is defined by: dv/dt(max)
Description : A 100 pF capacitor has a maximum charging current of 150 μA.What is the slew rate ? (A) 1.5 V/μs (B) 1.05 V/μs (C) 0.15mV/s (D) 10.5 mV/s
Last Answer : A 100 pF capacitor has a maximum charging current of 150 μA.What is the slew rate ? (A) 1.5 V/μs (B) 1.05 V/μs (C) 0.15mV/s (D) 10.5 mV/s
Description : Which of the following is not true: A) An oscillator is a circuit that converts DC to AC B) An oscillator is an amplifier that supplies its own input signal C) All oscillators generate sine waves D) In phase feedback is called positive Feedback
Last Answer : C) All oscillators generate sine waves
Description : What are the characteristics of ideal Opamp?
Last Answer : Infinite open loop voltage gain Infinite input impedance Zero output impedance Infinite Bandwidth Zero offset voltage
Description : It consists of a diode and an opamp and has the ability to clip low level signals
Last Answer : precision diode
Description : The closed loop gain of an OPAMP is dependent upon, whether the OP AMP is used : - a) in inverting mode b) in non -inverting mode c) is independent of the fact whether the ... inverting terminal d) is depending upon the fact whether the input is connected to inverting or non -inverting terminal
Last Answer : The closed loop gain of an OPAMP is dependent upon, whether the OP AMP is used : - is depending upon the fact whether the input is connected to inverting or non -inverting terminal
Description : The large signal bandwidth of an opamp is limited by its: (1) Loop gain (2) Slew rate (3) Output impedance (4) Input frequency
Last Answer : The large signal bandwidth of an opamp is limited by its: Slew rate.
Description : For Cascode amplifier the output impedance becomes
Last Answer : For Cascode amplifier the output impedance becomes very high
Description : An operational amplifier has an open loop gain of 200,000. Its output exhibits saturation at 10V. The threshold differential voltage of the amplifier is A) 25 micro-volt B) 50 micro-volt C) 5 Volts D) 10 volts
Last Answer : An operational amplifier has an open loop gain of 200,000. Its output exhibits saturation at 10V. The threshold differential voltage of the amplifier is 50 micro-volt
Description : In Class ‘B’ amplifier, the output current flows for
Last Answer : In Class ‘B’ amplifier, the output current flows for half input cycle
Description : The transistor configuration to connect 4 W speaker with 600 W output impedance audio amplifier is • Common Emitter • Common Base • Common Collector • None of the above.
Last Answer : The transistor configuration to connect 4 W speaker with 600 W output impedance audio amplifier is Common Collector
Description : The main function of the transformer used in the output of a power amplifier is (A) To step up the voltage (B) to increase the voltage gain (C) to safeguard the transistor against overheating (D) to match the load impedance with dynamic output resistance of the transistor
Last Answer : The main function of the transformer used in the output of a power amplifier is to match the load impedance with dynamic output resistance of the transistor
Description : RF Design Question: 40MHz to 10MHz sine wave?
Last Answer : Is the 40 MHz manufacturered digitally? Do you have access to the clock/driver oscillator? Is everything analog? Can you add a 30 MHz signal and filter out the resulting 10 and 70 Mhz beats? You can synthesize a 10 MHz yourself with either a 555 timer or a Statek chip.
Description : Why is sine wave used more ?
Last Answer : Sine wave is used more because the output of the circuit with sine wave input is better. Calculation of sinusoidal voltage , current etc. is easy. Disruption caused by harmonics is less. Noise of AC circuit with sine wave is less.
Description : Otp shows then disconnect's in zelio sine wave inverter luminous 1600va?
Last Answer : Need Answer
Description : At what phase angle is the voltage momentarily constant in a sine wave?
Last Answer : We often see the peak and trough (maximum positive and maximumnegative excursions) of the sine wave considered as points ofmomentarily constant voltage. Those points are at phase angles of90 degrees and at 270 degrees.
Description : What is The time it takes for a sine wave to complete one cycle is called?
Last Answer : Feel Free to Answer
Description : Should I Buy a Modified or Pure Sine Wave Inverter?
Last Answer : Many people are unsure of the differences between a modified or pure sine wave inverter. Think of a modified sine wave inverter as a set of stairs. You will get power in blocks and there will be times ... to draw a lot of power should always be run on a sine wave inverter for consistency and safety.
Description : The RMS value of a sine-wave current may also be expressed as the _____________. A. average value B. maximum value C. effective value D. instantaneous value
Last Answer : Answer: C
Description : The agreed standard for measuring loudness is the loudness sensation produced by a 1000 Hz sine wave _____ dB above the listener’s threshold of hearing. A. 80 B. 50 C. 30 D. 40
Last Answer : D. 40
Description : A modulation which does not follow the sine wave pattern, it produces undesirable harmonics such as spurious emission A. 0% modulated B. Over-modulated C. Unmodulated D. 100% modulated
Last Answer : B. Over-modulated
Description : Graph of alternating current is a A. cos wave B. tan wave C. curve D. sine wave
Last Answer : sine wave
Description : A _________ sine wave is not useful in data communications; we need to send a _______signal. A) composite; single-frequency B) single-frequency; composite C) single-frequency;double-frequency D) none of the above
Last Answer : single-frequency; composite
Description : A sine wave in the ______domain can be representedby onesingle spikein the _____domain. A) time; frequency B) frequency; time C) time; phase D) phase; time
Last Answer : time; frequency