0
The loop gain of an oscillator refers to the product of the gains around the feedback loop of the oscillator circuit. It is a crucial factor in determining the stability and frequency of oscillation; for an oscillator to sustain oscillation, the loop gain must be equal to or greater than one at the desired frequency. If the loop gain is less than one, the oscillations will die out, while if it exceeds one, it can lead to instability or distortion. Adjustments to components within the feedback loop can help achieve the desired loop gain for stable output.
What else can I help you with?
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.
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
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
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
How phase shift oscillator introduces phase shaft of 180 degree?
You mean "how does a phase shift oscillator introduce a phase shift of 180 degrees?" OK, we need two things for this type of oscillator: 1. A loop gain of more than 1.0, 2. A loop phase shift of zero degrees. The PSO achieves the gain using a valve, transistor, or op amp. It achieves the loop phase shift using (i) an inverting amplifier, equal to a phase shift of 180º, plus (ii) a network (usually resistor-capacitor) with a further phase shift of 180º. The loop shift is thus (180+180) = 360º/ zero degrees. It's easiest to use a three-part phase shift network, as the theoretically-possible two-part is difficult to make work, and the four-part is unneccessarily complex. The required phase shift of exactly 180º occurs at only one frequency, determined by the values of R and C.
