Hi,  I have a question about bode plot measurement setup of a switching converter.  In measuring the close frequency response of a dc/dc converter, it...
... converter. ... is a well-known practice that the closed loop needs to be broken to insert a low value resistor (to inject the perturbation signal across ...
... switching converter. ... it is a well-known practice that the closed loop needs to be broken to insert a low value resistor (to inject the perturbation...
 Thanks, Frank. I went through the algebra in the paragraph below and yes it yields the formula in my email.   Regards.  "You are measuring the voltage...
From: David Middlebrook. Hi Neil:The expression you quote was developed in my 1975 paper, which can be downloaded from the Files section of this Group: ...
Mark, You will obtain the expression if you solve equation (18) for T. Z1 corresponds to Zin, Z2 to Zout. Best regards, Frank ... measurement related question ...
 I read this paper and it was very usefull in understanding issues related to loop response measurement. I have some other question that I tried to solve by...
Mark, You might want to contact Venable Industries and ask them how the formula was derived and under what conditions it is valid. What strikes me is the fact...
As a matter of fact, I did contact Venable Industries through email but they didn't respond to my question. Maybe I should try once more...  Mark. ... ...
From: David Middlebrook. The expression in question is T =(T1+T2+2T1T2)/(1 – T1T2) (Eq.1) (Sorry, I have to keep to my own notation, with T1= -GAIN1, etc....
The capacitors just represent input, feedback and load elements in a typical example of a fully differential amplifier circuit. Actual values would depend on...
The capacitors just represent input, feedback and load elements in a typical example of a fully differential amplifier circuit. Actual values would depend on...
Hi Rob, Thanks for your reply. Appreciate it a lot. I tried running the differential-mode loop gain for the entire fully differential amplifier circuit with...
... This effect can often be seen if a differential circuit is slightly asymmetric, for example due to mismatch. From a stability point of view, there is no...
Frank is the best person to explain how to compute loop gains in a simulator. iprobe is an ammeter element defined in Cadence's Spectre. Spectre has a built-in...
... Regarding simulation, Cadence has a cmdmprobe component in analogLib that can be used to simulate differential-mode and common-mode loop gain. See...
Hi Frank and Rob, Thanks for your inputs. I tried using 3 methods 1) Middle brook approach 2) stb analysis with back to back balun and iprobe 3) stb analysis...
It sounds to me like you're using the analyses right. How are you modeling asymmetry in your op amp? Unless you've intentionally included some accounting for...
Hi Frank and Rob, Thanks for your inputs. I tried using 3 methods 1) Middle brook approach 2) stb analysis with back to back balun and iprobe 3) stb analysis...
Hi Frank and Rob, Thanks for your inputs. I tried using 3 methods 1) middlebrook approach 2) stb analysis with balun back to back and iprobe 3) stb analysis...
Hi Frank and Rob, Thanks for your inputs. I tried using 3 methods 1) Middle brook approach 2) stb analysis with back to back balun and iprobe 3) stb analysis...
Hi Frank and Rob, Thanks for your inputs. I tried using 3 methods 1) Middle brook approach 2) stb analysis with back to back balun and iprobe 3) stb analysis...
Hi all, I used stb analysis from Cadence ADE to get the loop gain and loop phase of stability of my LDO. For high ESR value, the stb analysis shown that the...
carmen82_kee
carmen82_kee@...
Jun 12, 2009 9:22 am
224
Sorry, i re-upload the waveform again. http://www.flickr.com/photos/39362887@N04/3618572017/...
carmen82_kee
carmen82_kee@...
Jun 12, 2009 11:03 am
227
... The timesteps of your transient simulation might be too large for the oscillation frequency of your circuit. You could try to start the oscillation by...
Having problems with message search?
Fill out this form to ensure your group is one of the first to be migrated to the new message search system.
