Abstract
The objective of this work is to present practical design consideration of fractional-N frequency synthesis focusing on different aspects from integer-N frequency synthesizer design. In this work, a ΔΣ fractional-N frequency synthesis technique for high spectral purity is primarily considered. Th ΔΣ fractional-N synthesizer offers several advantages over integer-N synthesizers and conventional fractional-N synthesizers. However, superior performance of the ΔΣ fractional-N synthesizer can be possibly limited by noise coupling, nonlinearity, and out-of-band phase noise performance. Design efforts and system perspectives both for the ΔΣ modulator and the PLL are needed to overcome those issues. System and circuit design aspects in ΔΣ fractional-N synthesizer design have been addressed followed by experimental hardware results.
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