A 0.3-to-5.5 GHz Digital Frequency Discriminator IC with Time to Digital Converter and Edge Counter for Instantaneous Frequency Measurement

Akihito HIRAI  Koji TSUTSUMI  Hideyuki NAKAMIZO  Eiji TANIGUCHI  Kenichi TAJIMA  Kazutomi MORI  Masaomi TSURU  Mitsuhiro SHIMOZAWA  

IEICE TRANSACTIONS on Electronics   Vol.E102-C    No.7    pp.547-557
Publication Date: 2019/07/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.2018CTP0002
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuits and Their Application Technologies)
digital frequency discriminator (DFD),  instantaneous frequency measurement (IFM),  time-to-digital converter (TDC),  multiphase clock,  

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In this paper, a high-frequency resolution Digital Frequency Discriminator (DFD) IC using a Time to Digital Converter (TDC) and an edge counter for Instantaneous Frequency Measurement (IFM) is proposed. In the proposed DFD, the TDC measures the time of the maximum periods of divided RF short pulse signals, and the edge counter counts the maximum number of periods of the signal. By measuring the multiple periods with the TDC and the edge counter, the proposed DFD improves the frequency resolution compared with that of the measuring one period because it is proportional to reciprocal of the measurement time of TDC. The DFD was fabricated using 0.18-um SiGe-BiCMOS. Frequency accuracy below 0.39MHz and frequency precision below 1.58 MHz-RMS were achieved during 50 ns detection time in 0.3 GHz to 5.5 GHz band with the temperature range from -40 to 85 degrees.