Hi All,
My understanding of the harmonics has been: first harmonic is fundamental times one, second harmonic is fundamental times two, third harmonic is fundamental times three, and so on. This is how I have seen it described in books also. I do not remember any recent book that provides this type of information. During our filter design class, we were normally asked to filter third harmonic properly, as this was generally most significant after the fundamental. In a square wave with 50% duty cycle, the even harmonics will generally be non-existent (2nd, 4th, etc.). Regards, Ravinder Email: [email protected] *************************************************************************** Always do right. This will gratify some people and astonish the rest. .... Mark Twain [email protected] (Scott Douglas) on 04/21/99 10:38:17 AM Please respond to [email protected] (Scott Douglas) To: [email protected] cc: (bcc: Ravinder Ajmani/San Jose/IBM) Subject: Harmonics Hi All, Recently an interesting discussion came up about harmonics. A general disagreement followed. We hope you all can offer some insight and perhaps help us settle the question. The question is numbering of harmonics. One side says that given a fundamental frequency of 200 MHz, the first harmonic is 400 MHz, the second harmonic is 600 MHz and the third harmonic is 800 MHz. The other side says that given a fundamental frequency of 200 MHz, the first harmonic is 200 MHz (or same as fundamental), the second harmonic is 400 MHz and the third harmonic is 600 MHz. The other part of the discussion revolved around even and odd harmonics. One side says that even harmonics are lower amplitude than the odd harmonics, the other side says odd harmonics are lower amplitude than even harmonics. All discussions assumed non-sinusoidal sources, generally our sources are square- or modified-square waves. Can someone shed some light on harmonic numbering and if possible, point to a reference material that specifies this? Thanks in advance for your input. Regards, Scott [email protected] --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators). --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
