Re: PCB power planes?

John Larkin wrote:
On 7 Jul 2008 17:04:56 GMT, Scott Seidman
<namdiesttocs@xxxxxxxxxxxxxx> wrote:

Joerg <notthisjoergsch@xxxxxxxxxxxxxxxxxxxxx> wrote in news:x26ck.31503
$ZE5.27544@xxxxxxxxxxxxxxxxxxxx:

Noise from clocks and stuff: None.
That's not my experience. Switched cap filts are famous for clock bleed through, and you need to be sure your circuit can tolerate this. The clock frequency is usually an order of magnitude or more higher than the filter freq, so you can usually filter out the bleedthrough with an RC.

Also famous for aliasing inputs, aliasing power supply noise, and
making a heap of noise of their own. But the programmability is nice.


Look at the bright side: You can make really nice mixers and stuff with them. If they just weren't so darn expensive.


The world needs a general-purpose programmable continuous-time lowpass
filter IC. Really.


If you use the R2R ladders of DACs you could make one around chips like these:
http://datasheets.maxim-ic.com/en/ds/MAX274-MAX275.pdf

Of course, then you'd be on the phone with Rebecca all the time.

--
Regards, Joerg

http://www.analogconsultants.com/

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