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zahrein
Joined: 28 May 2004
Posts: 144
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 11 Sep 2004 9:39 Questions on electronics? |
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I wanna ask about ac equivalent circuit and the feedback series topology.
If i made a calculation based on ac equivalent circuit, is it similar as the formula given by the feedback topology( 4 type of feedback topolgy)?
im confused as i used to do ac equivalent circuit ...and when i studied the feedback topology , it gives different formula according to the feedback type topology.
I am confused, as i think it shoud be the same. Does ac equivalent circuit comply to all circuit or we must refer to what type of topology that we are dealing with...?
Thank u...
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wky
Joined: 23 May 2003
Posts: 163
Helped: 82
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| 11 Sep 2004 13:19 Re: Questions on electronics? |
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Don't quite understand your question.
The 4 different feedback topologies should have different ac equiv. circuits to take into account the feedback effect on ac performance.
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savadi
Joined: 14 Sep 2004
Posts: 27
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| 15 Sep 2004 21:47 Re: Questions on electronics? |
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| zahrein wrote: |
I wanna ask about ac equivalent circuit and the feedback series topology.
If i made a calculation based on ac equivalent circuit, is it similar as the formula given by the feedback topology( 4 type of feedback topolgy)?
im confused as i used to do ac equivalent circuit ...and when i studied the feedback topology , it gives different formula according to the feedback type topology.
I am confused, as i think it shoud be the same. Does ac equivalent circuit comply to all circuit or we must refer to what type of topology that we are dealing with...?
I think you must define precisely the input of circuit. it is possible the input of circuit be a voltage source. but if the feedback will be shunt in the input, you must define current as the input. consequently, the feedback solution gives you for example Vout/Iin norVout/Vin. you must then calculate Iin/Vin. Note that the correct calculation of feedback and ac is equallent.ac is correct for any circuit that biased in saturation reagion.
Thank u... |
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ramone
Joined: 05 Oct 2003
Posts: 60
Location: Patras University
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| 16 Sep 2004 0:06 Re: Questions on electronics? |
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Well as the previous one said you must define the topology (wheter shunt-series on input and/or output)... After you have correctly defined that you may take the ac equivalent as the topology tells you to do.... So the questions is how to define topology:
2 Suggestions:
1) try reading Sedra/ Smith - Microelectronic Circuits... it is far the best book ever
2) try defining some practical rules for telling wheter it is shunt or series (some topologies of the nodes etc....)
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khafaji
Joined: 28 Sep 2004
Posts: 19
Helped: 1
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| 08 Oct 2004 23:46 Questions on electronics? |
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| you can refer to Grey/Meyer Analog Integrated Circuits book .it is very good book.
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devrimaksin
Joined: 13 Oct 2004
Posts: 93
Helped: 9
Location: Dallas, Texas, USA
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| 15 Oct 2004 3:01 Questions on electronics? |
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Small signal analysis
and feedback analysis should give the same
result. I agree with the other comment
you should properly define the feddback
virvuit (input and output quantities) and th ecircuit
and properly apply the teory.
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