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15 Threads found on edaboard.com: **Barkhausen Criterion**

Hello all.
There are always lots of different definitions for phase margin.... it becomes sometimes quite confusiong.
The phase margin problem hapens when you have a feedback system.
I believe that the best definition is:
1- A feedback system becomes unstable if the total phase delay of the system is greater than or equal to 360 degrees (Bar

Analog Circuit Design :: 09.10.2004 11:18 :: sinatra :: Replies: **7** :: Views: **2738**

a phase shift oscillator is just basically a type of oscillator. a phase shift oscillator is a feedback oscillator. for a feedback circuit to be an oscillator it must satisfy two conditions (known as the **barkhausen** **criterion**). one is that the gain around the closed loop should be unity. and the phase shift around the closed loop should be zero.

Electronic Elementary Questions :: 08.01.2005 13:40 :: samcheetah :: Replies: **2** :: Views: **2384**

Hi all,
When I design a ring osc VCO, I run into a problem when I want to simulate the delay cell's gain. I used a pseudo-differential delay element(Sungkyung Park et al.,Elec. Letters May,2001)
My question is: how to consider (both in theory and in simulation) the pseudo differential delay element?s gain? According to the **barkhausen** Cr

Analog Circuit Design :: 23.08.2006 01:56 :: trashbox :: Replies: **2** :: Views: **1045**

Hartley Oscillator - b/c of it's Inductive divider....split inductance.
The frequency of oscillator should be:
f = 1/(2*pi*√(L*C))
if you NEGLECT the transistor capacitances.
Otherwise, you have to replace the transistor with its small signal model and calculate the loop gain. Finally, apply the **barkhausen** **criterion** to obtain an

Analog Circuit Design :: 05.05.2007 00:16 :: zeeshanzia84 :: Replies: **5** :: Views: **751**

you need to give an initial condition to start the oscillator, is it a 5 stage ring inverter based oscillator or 5 stage differential ring oscillator.For the former you need to just connect the inverters back to back, for the latter you need to set the gain of the differential pairs such that **barkhausen** **criterion** is satisfied.
amarnath

Analog Circuit Design :: 29.08.2007 12:37 :: amarnath :: Replies: **14** :: Views: **3627**

if three cmos inverters are connected one after the other, will the o/p be stabe or oscillating if the o/p of the last cmos is fed back to the i/p of the 1st cmos...
wat if 2 cmos n 1 cmos is connected in the same manner......
i think if 1 n 3 cmos is connected o/p is oscillating,and stable if this correct?..where does **barkhausen** criter

Analog Circuit Design :: 16.10.2008 12:17 :: sarika :: Replies: **2** :: Views: **660**

Hi Prashant,
Thanks for the paper. One small question... we know for oscillations to begin other than **barkhausen** **criterion** a startup **criterion** is also required... Is there a relation for the Ring VCO.

Analog IC Design and Layout :: 20.10.2008 11:59 :: steadymind :: Replies: **3** :: Views: **1978**

An oscillator delivers some kind of energy. Where does it come from ?
Answer: Such a passive RC circuit as shown in the link has to be combined with an amplifier in order to work as an oscillator. This passive ladder has the task to produce at a certain frequency a phase shift of 180 deg. Combine it with an inverting amplifier (with the appropriat

Analog Circuit Design :: 01.09.2009 03:20 :: LvW :: Replies: **1** :: Views: **1634**

Hi,
My question may be absurd but can anyone tell me whether we can apply Barkhusen criteria for astable multivibrators? If it is possible,how?
No, you can't.
The reason is simple: The **barkhausen** oscillation **criterion** is based on the loop gain of a circuit with feedback. Any "gain" by definition is a small signal par

Analog Circuit Design :: 18.01.2010 10:38 :: LvW :: Replies: **1** :: Views: **972**

What's the matter...wrong forum?
/bump
OK, I´ll try to give you some hints.
In general, you have two alternatives to analyze the CLAPP oscillator:
a) The circuit is considered as a two pole oscillator based on the negative resistance principle. In this case, there is no "**barkhausen**" **criterion** because this condition is

RF, Microwave, Antennas and Optics :: 14.03.2010 17:22 :: LvW :: Replies: **3** :: Views: **2076**

Thank you ajishgopalr for this video i need more and more explanations
Shahabaz, it is not possible to explain here the oscillation principle in detail.
*Just some basic rules: The keyword for an oscillatory circuit is "positive feedback". That means, you have to connect an amplification unit (gain A) and a passive

Electronic Elementary Questions :: 15.02.2011 04:22 :: LvW :: Replies: **4** :: Views: **565**

When we design an oscillator, sometimes we design in terms of voltage, then we have to satisfy the **barkhausen** **criterion**: gain * feedback = 1. In this condition, feedback is mandatory.
But we also use the reflection coefficient to design an oscillator, in which case we have to satisfy the following:
Γin * Γs = 1. And usually in this co

RF, Microwave, Antennas and Optics :: 19.03.2011 05:23 :: lamchidinh :: Replies: **7** :: Views: **623**

The **barkhausen** **criterion** requires a loop gain of equal or larger than unity and a phase shift of 360 deg at a certain frequency.
In a typical ring oscillator the loop gain always is larger than unity. Each stage has an inherent delay, which can be increased using external capacitors.
There is one particular frequency Fo for which this total delay

Analog Circuit Design :: 20.07.2012 15:49 :: LvW :: Replies: **3** :: Views: **461**

According to the bode plot of the loop gain, at low frequency, the phase shift is 180 degree, while its gain is well above 1(0dB).
It is unstable when we refer to **barkhausen** **criterion**.
Will the low frequency component oscillate?
I have seen a similar question in here but the answers in that thread is really chaotic. So

Electronic Elementary Questions :: 29.03.2014 05:13 :: LvW :: Replies: **4** :: Views: **301**

Hi,
I suppose you misunderstood the meaning of the gain margin.
The original circuit is stable with a gain margin plus 7.6 dB (because at -180 deg the gain falls below zero dB) - that means you have to increase the gain by 7.6 dB to reach the stability limit.
That means: Under these conditions (stability limit) your circuit - after closing

Analog Circuit Design :: 10.04.2012 11:55 :: LvW :: Replies: **16** :: Views: **562**

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