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A 65 nm 19.1to20.4 GHz SigmaDelta FractionalN Frequency Synthesizer with TwoPoint Modulation for FMCW Radar Applications
Yuanyuan XU Wei LI Wei WANG Dan WU Lai HE Jintao HU
Publication
IEICE TRANSACTIONS on Electronics
Vol.E102C
No.1
pp.6476 Publication Date: 2019/01/01
Online ISSN: 17451353
DOI: 10.1587/transele.E102.C.64
Type of Manuscript: PAPER Category: Electronic Circuits Keyword: CMOS, FMCW radar, fractionalN, phase locked loop, frequency synthesizer, twopoint modulation,
Full Text: PDF(2MB)>>
Summary:
A 19.1to20.4 GHz sigmadelta fractionalN frequency synthesizer with twopoint 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 rootmeansquare (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.

