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A 65 nm 19.1-to-20.4 GHz Sigma-Delta Fractional-N Frequency Synthesizer with Two-Point Modulation for FMCW Radar Applications

Yuanyuan XU, Wei LI, Wei WANG, Dan WU, Lai HE, Jintao HU

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Summary :

A 19.1-to-20.4 GHz sigma-delta fractional-N frequency synthesizer with two-point modulation (TPM) for frequency modulated continuous wave (FMCW) radar applications is presented. The FMCW synthesizer proposes a digital and voltage controlled oscillator (D/VCO) with large continuous frequency tuning range and small digital controlled oscillator (DCO) gain variation to support TPM. By using TPM technique, it avoids the correlation between loop bandwidth and chirp slope, which is beneficial to fast chirp, phase noise and linearity. The start frequency, bandwidth and slope of the FMCW signal are all reconfigurable independently. The FMCW synthesizer achieves a measured phase noise of -93.32 dBc/Hz at 1MHz offset from a 19.25 GHz carrier and less than 10 µs locking time. The root-mean-square (RMS) frequency error is only 112 kHz with 94 kHz/µs chirp slope, and 761 kHz with a fast slope of 9.725 MHz/µs respectively. Implemented in 65 nm CMOS process, the synthesizer consumes 74.3 mW with output buffer.

Publication
IEICE TRANSACTIONS on Electronics Vol.E102-C No.1 pp.64-76
Publication Date
2019/01/01
Publicized
Online ISSN
1745-1353
DOI
10.1587/transele.E102.C.64
Type of Manuscript
PAPER
Category
Electronic Circuits

Authors

Yuanyuan XU
  Fudan University
Wei LI
  Fudan University
Wei WANG
  Fudan University
Dan WU
  Fudan University
Lai HE
  Fudan University
Jintao HU
  Fudan University

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