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Xiang Gao; Klumperink, E.A.M.; Bohsali, M.; Nauta, B.
IEEE journal of solid-state circuits, 2009-Dec., 2009-12-00, 20091201, Letnik: 44, Številka: 12Journal Article
This paper presents a 2.2-GHz low jitter sub-sampling based PLL. It uses a phase-detector/charge-pump (PD/CP) that sub-samples the VCO output with the reference clock. In contrast to what happens in a classical PLL, the PD/CP noise is not multiplied by N 2 in this sub-sampling PLL, resulting in a low noise contribution from the PD/CP. Moreover, no frequency divider is needed in the locked state and hence divider noise and power can be eliminated. An added frequency locked loop guarantees correct frequency locking without degenerating jitter performance when in lock. The PLL is implemented in a standard 0.18- ¿m CMOS process. It consumes 4.2 mA from a 1.8 V supply and occupies an active area of 0.4 × 0.45 mm 2 . With a frequency division ratio of 40, the in-band phase noise at 200 kHz offset is measured to be -126 dBc/Hz. The rms PLL output jitter integrated from 10 kHz to 40 MHz is 0.15 ps.
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