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Topic: Need help with Simulink "Memory" block.
Replies: 1   Last Post: Nov 18, 1996 1:28 PM

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Tom Cipollone

Posts: 13
Registered: 12/7/04
Need help with Simulink "Memory" block.
Posted: Nov 16, 1996 12:59 PM
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I am trying to use Simulink to simulate a PLL. I have dowmloaded an M
file from the ftp site
"ftp.mathworks.com/pub/contrib/simulink/vco/pll.m" which in fact is a
model of a PLL.

In this M file there is a VCO block, which I have also loaded. Inside
the block, there is another block called "memory". I am trying to figure
out the function of the "memory" block. The only explanation that I can
find in the help files states : Applies a one integration step delay.
The output is the previous input value. Use it to break algebraic
loops."

I know what an integrator is and how it is used in the continuous
domain. I know what a unit delay is and how it is used in the discrete
domain. But I do not know how an integration step delay is used in the
continuous domain. How do you know how long an integration step delay is
?

Please point me to any application notes concerning this topic that I
may have missed.

Also, under what circumstances would I want to use the "clock" block. I
noticed that it was also used in the pll.m simulink file mentioned
above.

Thank you

Tom





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