90 degree phase shifter

pi are round, cakes are square ;-)

...Jim Thompson

Y = sin(0t)

Shifted version

Y = sin(0t + PI/2)

He let 'em eat cake!

Well your question is nonsence, try again, someone might help you out.

Your response is nonsense, try again, there's already been a lot of help from people who have a clue.

Lets see now, a 0hz sinewave? now lets try and phaseshift it.

--- OK, here's the way I suggested:

COUNT SIN ROM SIN DAC +------+ +-------+ +-------+ HFCK>--+--|> Qn|--+--------|An Dn|---|Dn OUT|--[R]--+-->SIN | . . | . . . . | | . . | . . . . [C] | . . | . . . . | | | Q0|--|-----+--|A0 D0|---|D0 | GND | +------+ | | +-------+ |__ | +------------|-----|-------------O|LE | | | | +-------+ | | | | | | | | | COS ROM COS DAC | | | +-------+ +-------+ | +-----|--|An Dn|---|Dn OUT|--[R]--+-->COS | | . . . . | | | . . . . [C] | | . . . . | | +--|A0 D0|---|DO | GND | +-------+ |__ | +--------------------------------O|LE | +-------+

Note that if HFCK is stopped the frequency of SIN and COS will be

-- John Fields Professional Circuit Designer

This seems to come down to the problem of how you resolve a DC voltage into its phase and magnitude.

If you know or can safely presume a representation of the form A sin ( Bt + c ) then you can easily phase shift it.

If you don't know, can't request more information, and can't get away with making an arbitrary decision, then yes you have an undefined problem.

Mathematically speaking, it's perfectly acceptable. In fact, I would be more worried about a model that treated 0 as a special case.

And since it is hard to describe a range whose lower bound is 0 without using 0 as the lower bound...

-Le Chaud Lapin-

You may send your check to: Richard Grise c/o ABI Engineering

Please pay to the order of Richard M. Grise.

Thanks! ;-) Rich

Huh?

X >= 0 is a lot different from X > 0, in a lot of ways - ask any programmer! :-)

Cheers! Rich

With a big army, I assume.

John

Declarations require little more than a piece of paper or a microphone. Reality is something else.

Kal

That's kind of an oxymoron, as you know. As Commander-in-Chief of all of the US Military, I would simply declare it unilaterally, and simply lead by example.

What's the only country on Earth that's currently engaged in aggression against one or more foreign countries?

Thank you very much.

Cheers! Rich

By making armies unnecessary. :-)

Cheers! Rich

And don't forget, this follows A, B, and C - get them done, and nobody will feel like fighting. ;-)

Cheers! Rich

Your A, B, and C conditions were true for most of human history. And human history is overwhelmingly the history of war.

John