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Effects of Oscillator Phase Noise on Frequency Delta Sigma Modulators with a High Oversampling Ratio for Sensor Applications
Koichi MAEZAWA Masayuki MORI
IEICE TRANSACTIONS on Electronics
Publication Date: 2021/09/01
Online ISSN: 1745-1353
Type of Manuscript: BRIEF PAPER
Category: Microwaves, Millimeter-Waves
delta sigma modulation, frequency delta sigma modulation, phase noise, microwave oscillator,
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Frequency delta sigma modulation (FDSM) is a unique analog to digital conversion technique featuring large dynamic range with wide frequency band width. It can be used for high performance digital-output sensors, if the oscillator in the FDSM is replaced by a variable frequency oscillator whose frequency depends on a certain external physical quantity. One of the most important parameters governing the performance of these sensors is a phase noise of the oscillator. The phase noise is an essential error source in the FDSM, and it is quite important for this type of sensors because they use a high frequency oscillator and an extremely large oversampling ratio. In this paper, we will discuss the quantitative effects of the phase noise on the FDSM output on the basis of a simple model. The model was validated with experiments for three types of oscillators.