Re: Sine generator IC solution?

From: Joel Kolstad (JKolstad71HatesSpam_at_Yahoo.Com)
Date: 01/30/05 

Date: Sun, 30 Jan 2005 10:17:40 -0800

"richard mullens" <mullensdeletethis@ntlworld.com> wrote in message
news:ny6Ld.873$vC.285@newsfe3-win.ntli.net...
> John Woodgate wrote:
> I think that this presupposes a certain knowledge on the part of the
> questioner.
> For instance I was looking for a colpitts oscillator on the internet. I
> found a number of examples, but I couldn't easily find any that discussed
> how it operated, or how one should decide on the ratio of the values of
> the capacitors in the circuit, or which of a comparator, opamp, Cmos
> inverter, Fet, or MosFet etc would be best.

That's because most of what you find on the Internet is a copy of a copy of
a copy of a design. There are some good truly 'technical' web sites out
there, but by and large a lot of actual circuit design and analysis is still
found only in textbooks (e.g., "Sedra and Smith").

Also keep in mind that something as seemingly simple as an oscillator is a
circuit that people can spend an awful long time designing in many different
manners. After getting some theory from S&S, you could go and read a
perhaps somewhat more practical point of view from The Art of Electronics,
scurry around and find some detailed application notes on transistor or
capacitor selection, etc. The folks arguing that throwing a 'complex'
solution at the problem (e.g., a square wave generator followed by a
switched capacitor filter) is overkill are effectively assuming that you
have 'modest' needs with regards to performance; this may or may not be
true.

It's getting harder and harder to give people 'simple' solutions at all
anymore because technology has become so advanced. These days if someone
asks here how to build a radio, they want it to use PLL synthesized digital
tuning, have stero reception, etc. -- since, after, all, the $10 radio at
Wal*Mart can do all that! -- and the requirements are pretty much impossible
to meet within hobbyist/student constraints without turning to 'complex'
solutions such as single chip radios.

---Joel Kolstad

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