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Static charge pump mismatch causes fractional-N frequency synthesizers to exhibit an elevated in-band noise floor and in-band spurious tones (spurs). When the PFD-CP includes a reset delay, the noise floor and spurs first increase with the mismatch, reach a maximum value, and then decrease. By considering a simplified piecewise-linear model of the spur production mechanism, we derive an analytical...
Digital Delta-Sigma Modulators (DDSMs) are widely used in fractional-N frequency synthesizers. Much design effort is typically expended to smooth and shape the DDSM's output spectrum. This good work can be undone by nonlinearities in the phase-locked loop (PLL) which cause the noise floor resulting from the DDSM to rise, thereby degrading the inband phase noise performance of the system. This paper...
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