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use a diode to simulate, since diode has 1/f noise behavior and we can input the bias current and AF, KF to control the noise floor and 1/f noise corner frequency.
Transformer Design
there is a chapter in <Fundamental of power electronics> book by Erison.
In the transformer chapter, a detail design procedure is introduced. good luck
It dependence on the model you setup, if the model you setup in pspice is the near the same as you calculate, the error will be within 5%.
At less, I did the noise calculation by mathmatica and Pspice simulation, the difference is less than 3%
I think phase margin is more intuitive for the stability. Cause we can easily know that the loop gain at the cross over frequency(f1) is:
T(j*f1)=-exp(j P) where P is the phase margin here.
the error function at f1 then be:
1/(1+1/T(j*f1))=1/(1--exp(j P))
We can easily calculated that only P<60...
filter design help
For basic, Franco's book is good, but <active and passive analog filter design> by huelsman gave more detail. If you are lazy, I recommend you use free software Fields by national or Filter assistant by analog.
The humidity envoromental will also deteriote the detection performance at low frequency,mainly due to the cell effect and leackage.
Baking help to remove the chemical dust and the mosture on the device surface.
at that low frequency measurement, you need to set up a damping system, etc.
air...
I think if you want to measure DC current, A capacitor in the feedback will help much. you can easily acquire by integral of this(set the detection period long enough to avarage the low frequency noise). you can read Bob Pease's letter on national's website, it will help you much. surelly the 20...
Surely these low frequency noise comes from two reason:
1: 1/f noise
2: envromental noise(temperature drift, vibration, etc)
you need a high pass filter to filter this low frequency noise
Hi, thanks for reading.
Currently, I am encountering a simulation problem.
I want to simulate a resistor with a resistance that is frequency dependance. Because of the noise limitation, I can not use the normal R device in Pspice. Instead I use G device (Voltage --> current) in the analog...
Because you need to break the loop to find Loop gain. In Rosenstark's theory(in the book with name of "Feedback amplifier princeples"), he gave a method of how the inject signal and the return signal can determined the loop gain: as following:
T=-1/(1/Toc+1/Tsc)
where Toc is the open circuit...
I've solve this problem.
It fail to use a correct component. and I replace the diode with the resistor, I found that there is still not correct output, so I think there must be something wrong, later I found that I use Hpoly instead of H device. after I change the Hpoly to H device, it works...
the benefit pcb teardrops
Teardrop helps in high frequency (smooth angle change will reduce frequency reflect)
and prevent track break at the connect point with via.
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