f...@kokkinizita.net wrote:
On Tue, Jan 18, 2011 at 05:53:01PM +0000, Geoffrey Barton wrote:
How do you justify that assertion?
How do you justify your assertion that phase errors of 1 degree are
OK but 4 degrees are not ?
Phase shifts changing with frequency also translate into amplitude
errors when the phase shifter chains are summed.
Of course. And it's quite easy to quantify these amplitude errors,
and their effect on the final result.
Not having to use analogue now makes this easily possible with a
good design, and at reasonable mips cost. Why accept less?
There is indeed no reason to accept less than what is required,
but accepting that doesn't answer the question of how much accuracy
is actually required. You tell me that 1 degree is OK and 4 is not,
but so far I haven't seen any analysis supporting this assertion.
Fons: Isn't this a typical case where you < don't know > what is required?
And because the case is affecting a relatively small group of
people/applicants, you wouldn't "invest" to peform a double-blind study.
Is it not possible to solve this problem with an accuracy of say <= 1ยบ
in all frequencies? (Speaking with the amateur hat on my head...)
Now, if a look to the first posting of Geoffrey Barton in this thread, I
fear that this discussion is missing the point.
:-)
Best,
Stefan
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