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Nonlinearity and time-variance in radio frequency (RF) circuits leads to unwanted harmonics and intermodulation products, e.g. in power amplifiers and mixers. This paper reviews a recently proposed multipath polyphase circuit technique which can cancel such harmonics and intermodulation products. This will be illustrated using a power upconverter IC as an example. The upconverter works from DC to...
Switching mixers are power-efficient but produce unwanted harmonics and sidebands. A multipath technique to clean up the spectrum using digital circuits and mixers, but no filters, is applied to a 0.13mum CMOS power upconverter. The circuit delivers 8mW from dc to 2.4GHz with 11% drain efficiency, with spurs <-40dBc over more than 4 octaves in frequency, and consumes 228mW from a 1.2V supply
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