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| To: | [email protected] |
|---|---|
| Subject: | Re: LF: RE: something for the weekend ?? |
| From: | [email protected] |
| Date: | Fri, 25 Apr 2003 12:02:30 EDT |
| Reply-to: | [email protected] |
| Sender: | <[email protected]> |
|
Hi Andy and group,
forgotten to mention this in my questionable explanation: For "adding" the 90° phase shift in the sin() and cos() arguments, it's most important that the arguments are positive, which is the case in 2*cos(a)*sin(b) but not necessarily in sin(a+b)-sin(a-b) . With a = 2*pi*f_signal * t and b = 2 * pi * f_lo * t, (a-b) can be a negative value which gives the wrong phase offset when ADDING 90° = pi/2 . Cheers, Wolf. |
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