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A 4-GHz All Digital PLL with Low-Power TDC and Phase-Error Compensation
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- Authors
- Ja-Yol Lee, Mi-Jeong Park, Byung-Hun Min, Seongdo Kim, Mun-Yang Park, Hyun-Kyu Yu
- Issue Date
- 2012-08
- Citation
- IEEE Transactions on Circuits and Systems I : Regular Papers, v.59, no.8, pp.1706-1719
- ISSN
- 1549-8328
- Publisher
- IEEE
- Language
- English
- Type
- Journal Article
- Abstract
- This paper presents a 4-GHz all-digital fractional-N PLL with a low-power TDC operating at low-rate retimed reference clocks, a compensator preventing big phase-error downfalls, and a loop settling monitor. Two retimed reference clocks, nCKR and pCKR, are employed in the TDC to estimate the fractional phase error between the low-rate reference and high-rate oscillator clocks. Applying the retimed reference clocks does not only reduce a dynamic power in its delay chain, but simplify a fractional phase-error correction. The phase-error compensator is introduced to avoid big phase-error downfalls caused by large output glitches originating from a high-speed accumulator. In addition, a loop-settling monitor is invented to allow the DCO operation mode to be shifted seamlessly and fast. By consuming 9.6 mW, the ADPLL achieves -97 dBc in-band phase noise, -38 dBc/Hz integrated noise, and 740 ns settling time. © 2004-2012 IEEE.
- KSP Keywords
- All-digital PLL, Dynamic power, Error Correction, Error compensator, Fractional-N PLL, High Speed, High rate, Low-Power, Low-rate, Operation modes, Phase error compensation