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Altera_Forum
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11 years ago

Inphase (I) and Quadrature (Q) components of signals

Hi All, How to calculate the Inphase (I) and Quadrature (Q) components of signals, such as RF signals? I would like to shift the RF signals to a specific baseband frequency and then derive the ...
Altera_Forum's avatar
Altera_Forum
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11 years ago

Hi Dave,

Thank you very much for the document. That is closely related to my project, DDC. I got two questions.

Q1. Does the center frequency of Eq 37 mean the carrier frequency of signals, on page 63 of ESC-104? For example, for 20MHz carrier frequency signals with bandwidth of 1 MHz and sampling frequency 40 MHz, the normalized frequency, fo, will be 20/40. Is it correct?

Q2. Why Eq 37 used -j not +j? Does it matter?

Many Thanks,

Lee