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sreejith
Joined: 17 Apr 2006
Posts: 80
Helped: 6
Location: India
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 28 Sep 2006 11:27 slew rate |
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what are the applications of slew rate?
what are the important parametrs that are tobe taken into care when designing
complex op-amp ckts..?
please answer.. thx in advance..
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konarkk
Joined: 10 Jun 2006
Posts: 420
Helped: 110
Location: Mumbai , India
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28 Sep 2006 11:36 Re: slew rate |
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Slew rate generally consider while u are using op amp for filter design, since it is a freq dependent .
Also a very good application of slew rate is that a single ckt can use as sine , square & even a triangular wave o/p
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Kral
Joined: 28 Mar 2005
Posts: 1182
Helped: 187
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28 Sep 2006 14:55 Re: slew rate |
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sreejith,
The important thing to remember is that gain-bandwidth product is a small signal parameter, while slew rate is amplitude dependent. For example, the slew rate of a sine wave with a 10V peak is 10 times the slew rate of a sine wave of the same frequency with a 1V peak. If you attempt to exceed the slew rate capability of an op-amp, one of the intermediate stages of the op-amp will saturate in an attempt to keep up with the input signal slew rate. During this time, the input specifications of the op-amp (input resistance, offset voltage, etc) will not be met. In addition, it will take a long time for the intermediate stage to come out of saturation, especially if the op-amp has a built in frequency compensation capacitor.
Regards,
Kral
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shaikhsarfraz
Joined: 08 Aug 2006
Posts: 309
Helped: 19
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29 Sep 2006 5:03 Re: slew rate |
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hi,
slew rate is defined as
dV÷dt, that is rate of change of voltage.
It determines how fast a circuit can charge or discharge the next stage.
thanks
sarfraz
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Miguel Gaspar
Joined: 06 Mar 2006
Posts: 391
Helped: 36
Location: Culiacán, Sinaloa, Mexico
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29 Sep 2006 15:21 slew rate |
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The slew rate is the capacity of the output stage of the opamp to change de voltage in certain time. Ej 13V/uS
but if the signal need a greater variation, then distorsion occours, not saturation.
There are about 30 parameters, but acourding your application some will be more important than for another application.
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