A new PLL chipset has been released by Hittite, featuring the HMC983LP5E DC to 7 GHz fractional-N divider and frequency sweeper, and the HMC984LP4E digital phase-frequency detector and charge pump. Together they form a solution targeted at PLL and FMCW sweeper applications requiring high performance. The HMC983LP5E integrates a programmable 48-bit delta-sigma modulator which allows the combined PLL to achieve fractional frequency resolution of 180 nHz. A built-in frequency sweeper enables the chipset to generate identical, coherent, FMCW frequency sweeps that can be linear, user-defined, automatic or triggered. Phase noise figure of merit performance is
-231 dBc/Hz in integer mode and -227 dBc/Hz in fractional mode.
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