RC integrator

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#1 21657722 03 Feb 2011 20:56

Mohammad Honarparvar Mohammad Honarparvar

Anonymous

Post #1
21657722 03 Feb 2011 20:56

how can I find a Design procedure for selection the resistor and capacitor in a simple RC integrator in .18 CMOS?
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#2 21657723 04 Feb 2011 00:17

Cody Miller Cody Miller

Anonymous

Post #2
21657723 04 Feb 2011 00:17

Hi Mohammad,

Are you talking about an active RC integrator like this?
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#3 21657724 04 Feb 2011 04:08

Mohammad Honarparvar Mohammad Honarparvar

Anonymous

Post #3
21657724 04 Feb 2011 04:08

hi
yea , exactly , in fact i want to implement a continuous time delta sigma modulator with active RC integrator in .18um CMOS tech. , as you know the transfer function of the of an integrator is (fs/s)=(1/RCs)[fs = sampling frequency] , now how can i select the resistor and the Capacitor?
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#4 21657725 05 Feb 2011 12:51

Cody Miller Cody Miller

Anonymous

Post #4
21657725 05 Feb 2011 12:51

The basic formula for the transfer function of the integrator is:

[tex]V_{OUT}=frac{-1}{jomega RC}V_{IN}[/tex]

This link also has some valuable information: http://www.electronics-tutorials.ws/opamp/opamp_6.html
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#5 21657726 07 Feb 2011 19:08

Mohammad Honarparvar Mohammad Honarparvar

Anonymous

Post #5
21657726 07 Feb 2011 19:08

thank you so much Cody
as you know the selection of R and C is not unique for a sampling frequency as mentioned before , so now ! what is the trade off between R and C in 0.18 CMOS technology
#6 21657727 07 Feb 2011 19:09

Mohammad Honarparvar Mohammad Honarparvar

Anonymous

Post #6
21657727 07 Feb 2011 19:09

so sorry
Dear Cody , i make a mistake in my notation
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