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What is the physical significance of infinite open loop voltage gain of an ideal operational amplifier?
Distortion is estimated as closed loop gain divided by open loop gain. If the open loop gain approaches infinity, distortion approaches zero.
If the gain of the open loop system is doubled then gain margin will become?
gain margin becomes half
What is the working principle of a colpitts oscilator?
The principle of LC tank ckt. which produces 180 deg phase shift the loop gain AB=1 in hartley oscillator are used 2 inductors and 1 capacitor.
The gain of an operational amplifier will be maximum?
A: the gain will be maximum at the open loop configuration and decrease as frequency increases
What is the difference between crystal and local oscillator?
oscillator frequency is different.crystal working piezo electric effect
What is the difference between finite open loop gain and closed loop gain?
In a closed loop system the gain without the feed back loop being closed is called open loop gain!!! e.g if forward gain is "A" and feed back factor is "B" then open loop gain is "AB" and closed loop gain will be [A/(A+B)]
What are the component of oscillator?
It can contain active and passive components with a positive feedback loop.
What is the various condition of a general oscillator?
The condition is called Barkausen criteria.They are 1. The loop gain of the circuit should be unity. 2. The total phase shift around the circuit should be zero.
Closed loop gain for feedback oscillators?
Feedback oscillators have a closed loop gain of
What is the physical significance of infinite open loop voltage gain of an ideal operational amplifier?
Distortion is estimated as closed loop gain divided by open loop gain. If the open loop gain approaches infinity, distortion approaches zero.
How is an oscillator Smith chart plot different from an amplifier Smith chart plot?
If you look at the reflection coefficient curve as a function of frequency, it follows a counter-clockwise direction about the Smith chart. You should see a loop, and at the "top" of the loop, that is the oscillation frequency.They both have in common an open-loop gain greater than one, however. So the curve will be outside the Smith chart.
How a triode valve can be used as an oscillator?
An amplifier can be made into an oscillator by feeding back part of the output to the input. A simple oscillator uses a Frequency Determining Network (FDN) in the feedback path to give a predictable frequency of oscillation. There are some simple requirements - the valve must be capable of operating at the desired frequency, and the total gain (loop gain) from output to input must be at least unity. Many oscillators use tuned inductive-capacitive circuits, but it's also possible to use a resistive-capacitive circuit, or a quartz crystal as the FDN.
Is the gain same for the same system in open loop and close loop?
no.
Is the gain same for same system in open loop and closed loop?
A: DEFINITELY NOT Open loop is defined as no feedback. any kind of negative feedback will reduce the gain
What is mean by stability of the oscillator?
Stability of the oscillator means the how much frequency stability it have. Measure of frequency stability comes from "rate of change of phase w.r.t frequency", the more it is the more stable the oscillator is, because we know that one condition for oscillation is that the loop gain phase shift should be zero, hence if due to ckt. parameters there is some change in phase then by very little variations in frequency we can bring back the loop gain phase shift to zero. ex. is LC tank circuit which act as an osciilator at resonant frequency. Frequency stability can also be measure from quality factor, the higher it is the more stable ckt. is,Parikshit ParasherB-tech ECE, PG power engg.parikshit_parasher@yahoo.co.in
Why open loop gain of op-amp is very high?
A; An ideal op amp should have infinite open loop gain so when the loop is closed with negative feedback it will be stable
What is nominal gain?
It is the ratio between the output over input. It is actually the theoretical gain. Say for closed loop gain, based on given resistor values R1 10ohms and R2 100ohms , nominal gain will be -R2/R1= -10 V/V while the actual closed loop gain is could actually be -9.999944 V/V. Moreover, nominal gain would usually refer to the closed loop gain, the open loop gain would have much bigger value.
