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ADC (Read 5634 times)
thomasT
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ADC
Jan 11th, 2012, 3:36am
 
hello,

I have just started working on Analog to digital converters with 8 bit and now doing some literature study.

i had some basic questions:
with sin input y = A sin wt with w = 2*pi*f,how we define clock frequency (is it same as input frequency of the signal? ), sampling frequency of the system?
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raja.cedt
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Re: ADC
Reply #1 - Jan 11th, 2012, 4:06am
 
f is input frequency, and there is no need to have precise  sampling frequency rather than fs>2*fin, so no need to specify any where.

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Raj.
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thomasT
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Re: ADC
Reply #2 - Jan 11th, 2012, 5:32am
 
raja.cedt wrote on Jan 11th, 2012, 4:06am:
f is input frequency, and there is no need to have precise  sampling frequency rather than fs>2*fin, so no need to specify any where.

Thanks,
Raj.


so in sin wt , does t represents 1/(Fclock) and Fclock = OSR*Fsampling??
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raja.cedt
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Re: ADC
Reply #3 - Jan 11th, 2012, 5:45am
 
t means time. read some basic books, there is no need to keep fsample in expressions..

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Raj.
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singh
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Re: ADC
Reply #4 - Jan 11th, 2012, 6:01am
 
t represents time
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thomasT
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Re: ADC
Reply #5 - Jan 11th, 2012, 6:17am
 
guys i know t represents time

i just need to know regarding clock frequency stuff?
is Fclock = Freq_sample * OSR?
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raja.cedt
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Re: ADC
Reply #6 - Jan 11th, 2012, 6:33am
 
Hello,
man please understand. Forget about OSR, at this point don't think about OSR. OSR is like how large your sampling frequency compared to Nyquist rate. Actually once you sample the signal there is no continuous signal only discrete signal.

Let us say you have signal called sin(2*pi*fin*t), now after sampling sin(2*pi*(fin/fs)*n). Here Fs is sampling frequency.


So there is no point asking after sampling what is the meaning of t

Thanks,
Raj.
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