What's the different between discrete integrator and continuous integrator in circuit implementation

Discussion in 'Electronic Design' started by boki, Oct 9, 2003.

1. bokiGuest

Hi, All:

1. What's the different between discrete integrator and continuous
integrator in circuit implementation?

2. How to classified continuous time filter and discontinuous time
filter?

Thanks!

Boki.

2. Tom BruhnsGuest

Mathematically, what's the differnce between an integration and a
integration techniques" and see if it all becomes clear. For even
more fun, try a discrete integration out on some common functions, and
see how much different the result is from a true integration of the
same function. Try different sampling periods. For example, if you
sample cos(t*2*pi) at t=0,.001,.002,... and integrate that, and then
compare with sampling the same function at t=0,1,2,..., what do you
see? You can do the discrete integration easily in Excel, for
example, or using Matlab or Scilab. If all you have is sampled
points, how can you know how accurately your discrete integration
represents the integral of the sampled function? Have you arrived in
your studies at Mr. Nyquist yet?

Cheers,
Tom

3. Robert BaerGuest

Sounds like questions for a test in a class.
How does one make an integrator?
Use an opamp, a capacitor, and a resistor.
What are the problems with that?
How about input bias current charging up the capacitor?
What does that mean?
How do i prevent that charging or remove that charge (and how often)?