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Spur-Slide7

This slide shows the same offset of RF to LO, resulting in the IF ~ 0.2 * LO, but now high side injection is being used. Therefore RF/LO is very close to 0.8. The 4x3 term is now very close to the IF fundamental, and if the RF to LO ratio were exactly 0.8, the 4x3 term would fall directly on the IF fundamental. If the RF/LO ratio was reduced even lower, the 4x3 term would come in at a lower frequency than the IF fundamental, and the 3x2 term would be closer to the fundamental.

PTM Published on: 2017-03-14