Define input bias current?

1 Answer

Answer :

It is defined as the average of the currents entering into the input terminals of an op-amp.

Related questions

Description : Define input offset current?

Last Answer : It is defined as the algebraic difference between the current entering the inverting and non-inverting terminal of an op-amp.

Description : What are the advantages of fixed bias circuit?

Last Answer : This is simple circuit which uses a few components. The operating point can be fixed any where on the Centre of the active region

Description : Define input offset voltage?

Last Answer : It is defined as the voltage that must be applied between the input terminals of an op-amp to nullify the output.

Description : Define current amplification factor?

Last Answer : It is defined as the ratio of change in output current to the change in input current at constant other side voltage.

Description : Define the term diffusion current?

Last Answer : A concentration gradient exists, if the number of either electrons or holes is greater in one region of a semiconductor as compared to the rest of the region. The holes and electron ... concentration. This process in called diffusion and the current produced due this movement is diffusion current.

Description : Define drift current?

Last Answer : When an electric field is applied across the semiconductor, the holes move towards the negative terminal of the battery and electron move towards the positive terminal of the battery. This drift movement of charge carriers will result in a current termed as drift current.

Description : How are amplifiers classified according to the input?

Last Answer : 1. Small – signal amplifier 2. Large – signal amplifier

Description : Why is input impedance of the FET very high?

Last Answer : BECAUSE its input circuit (gate to source) is reverse biased and input gate current is very small.

Description : Define Piezoelectric effect.

Last Answer : When applying mechanical energy to some type of crystals called piezoelectric crystals the mechanical energy is converted into electrical energy is called piezoelectric effect.

Description : Define non-inverting amplifier?

Last Answer : The input is applied to the non-inverting input terminal and the inverting terminal connected to the ground.

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 : Define loading?

Last Answer : A large value of Rc cannot be used in a circuit since,a large value of resistance requires a large chip area.For large Rc, quiescent drop across it increases and hence a large power supply is required ... source can also be used as an active load for an amplifier to obtain a very large voltage gain.

Description : Define PIV .

Last Answer : Peak inverse voltage is the maximum reverse voltage that can be applied to the PN junction without damage to the junction.

Description : What is reverse saturation current?

Last Answer : The current due to the minority carriers is called the reverse saturation current.

Description : Why transistor is called current controlled device?

Last Answer : The output voltage , current or power is controlled by the input current

Description : What is Reverse saturation current?

Last Answer : The current due to the minority carriers in reverse bias is said to be reverse saturation current. This current is independent of the value of the reverse bias voltage.

Description : Zener effect and avalanche effect are the two possible break down mechanisms that helps the external current . Why ?

Last Answer : Zener effect : The electric field in the depletion layer reach a point that it can break the covalent bonds and generate electron-hole pairs. Avalanche breakdown : The minority carriers that ... field gain sufficient kinetic energy to be able to break covalent bond in atoms which they collide.

Description : What would happen if the base resistor has zero resistance?

Last Answer : If the base resistance is zero, then the base current is very high. Since, we know that the base current is directly proportional to the collector current with the multiplying factor of current ... high. In this time, the transistor operates in saturation region and finally it is being destroyed.

Description : What is a Schmitt trigger?

Last Answer : Schmitt trigger is a regenerative comparator. It converts sinusoidal input into square wave output. The output of Schmitt trigger swings between upper threshold voltage and lower threshold voltage, the reference voltages of the input waveform.

Description : List the important characteristics of a voltage regulator.

Last Answer : The output voltage is fixed at a specified value, The unregulated voltage must be at least 2V more than the regulated voltage.

Description : What is Miller crystal oscillator? Explain its operation.

Last Answer : It is nothing but a Hartley oscillator its feedback Network is replaced by a crystal. Crystal normally generate higher frequency reactance due to the miller capacitance are in effect between the transistor terminal.

Description : How to produced 180° phase shift?

Last Answer : The most common way of achieving this kind of filter is using three identical cascaded resistor capacitor filters, which together produce a phase shift of zero at low frequencies, and 270 degrees at ... phase shift of 60 degrees and the whole filter circuit produces a phase shift of 180 degrees.

Description : What is phase-shift oscillator?

Last Answer : A phase-shift oscillator is a simple electronic oscillator. It contains an inverting amplifier, and a feedback filter which 'shifts' the phase of the amplifier output by 180 degrees at the oscillation ... 180° at high frequencies, so that the phase shift at the desired oscillation frequency is 180°.

Description : What are LC oscillators?

Last Answer : Inductive oscillators also known as LC oscillators are built of an tank circuit, which oscillates by charging and discharging a capacitor through an inductor. These oscillators are typically used when a tunable precision frequency source is necessary, such as with radio transmitters and receivers

Description : Types of Harmonic oscillator?

Last Answer : A5: There are many ways to implement harmonic oscillators, because there are different ways to amplify and filter. Some of the different circuits are: Hartley oscillator Colpitts oscillator Cross- ... crystal oscillator Phase-shift oscillator RC oscillator (Wien Bridge and "Twin-T")

Description : What is Harmonic oscillator?

Last Answer : The harmonic, or linear, oscillator produces a sinusoidal output. The basic form of a harmonic oscillator is an electronic amplifier with the output attached to an electronic filter, and the ... around the loop, being filtered and re-amplified until it increasingly resembles the desired signal.

Description : Types of electronic oscillator?

Last Answer : There are two main types of electronic oscillator: the harmonic oscillator and the relaxation oscillator.

Description : Application of electronic oscillator?

Last Answer : An electronic oscillator is an electronic circuit that produces a repetitive electronic signal, often a sine wave or a square wave. They are widely used in innumerable electronic devices. Common ... regulate computers and quartz clocks, and the sounds produced by electronic beepers and video games.

Description : What are the conditions for oscillation?

Last Answer : The total phase shift of an oscillator should be 360 degree. For feedback oscillator it should satisfy Barhausen criterion.

Description : What are the classifications of Oscillators?

Last Answer : *Based on wave generated: i. Sinusoidal Oscillator, ii. Non-sinusoidal Oscillator or Relaxation Oscillator Ex: Square wave, Triangular wave, Rectangular wave etc. *According to principle involved ... . Tuned collector base Oscillator iv. Hartley Oscillator v. Colpits Oscillator vi. Clap Oscillator

Description : What is Oscillator circuit?

Last Answer : Oscillators produce a waveform (mostly sine or square waves) of desired amplitude and frequency. They can take input from the output itself. For a complete oscillator circuit we require a feedback device, amplifier and feedback factor.

Description : What is the type of feedback used in an op-amp Schmitt trigger?

Last Answer : The type of feedback used in an op-amp Schmitt trigger is positive feedback.

Description : What is a monostable Multivibrator?

Last Answer : A monostable Multivibrator is a square wave shaping circuit having one stable state and another quasi stable state. It is often referred as single shot Multivibrator. It is also used as gating circuit and delay circuit.

Description : What is Astable Multivibrator?

Last Answer : Astable Multivibrator is a square wave circuit. It has two quasi stable states. It is also referred as free running Multivibrator.

Description : What is a Multivibrator?

Last Answer : Multivibrator is a wave shaping circuit which gives symmetric or asymmetric square wave output. It has two states. They may be either stable or quasi stable depends upon the type of the Multivibrator.

Description : What is meant by voltage follower?

Last Answer : If the output voltage of an op-amp follows the input i.e., if the output voltage is equal to the input voltage it is called as a voltage follower.

Description : What is the basic building block of an op-amp?

Last Answer : The basic building block of an op-amp is differential amplifier.

Description : List the applications of instrumentation amplifier.

Last Answer : a. Temperature indicator b. Temperature controller c. Light intensity meters d. Water flow meter c. Thermal conductivity meter f. Analog weight scale

Description : What is the type of feedback employed in the inverting op-amp amplifier?

Last Answer : Negative feedback is employed in the inverting op-amp amplifier.

Description : What are the DC characteristics of an op-amp?

Last Answer : a. input bias current b. Input offset current c .Input offset voltage d. Thermal drift

Description : What are the AC characteristics of an op-amp?

Last Answer : a. Frequency response b. Slew rate

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 : What are the methods used in external compensation technique?

Last Answer : a. Dominant-pole compensation b. Pole-zero compensation

Description : What is compensated op-amp?

Last Answer : Op-amp, which uses a capacitor internally for compensation, is called a compensated op-amp. This op-amp has a high gain stability and low bandwidth.

Description : What are the two compensating techniques used in frequency compensation?

Last Answer : Two types of compensating techniques are used, they are, a. External compensation b. Internal compensation

Description : What is an op-amp?

Last Answer : The operational amplifier is a multi-terminal device, which is quite complex internally. An operational amplifier is a direct coupled high gain amplifier usually consisting of one or more ... as well as ac input signals and was originally designed for computing such mathematical functions.

Description : What is the disadvantage of negative feed back?

Last Answer : Reduces amplifier gain.

Description : What is the advantage of negative feed back?

Last Answer : 1. increased stability 2. Increased bandwidth 3. Decreased noise 4. Less frequency distortion

Description : Which feedback increases the gain of the amplifier?

Last Answer : Positive feedback