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 digitaloutput 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. key words: delta sigma modulation, frequency delta sigma modulation, phase noise, microwave oscillator
内容記述
Advance publication (published online immediately after acceptance)
引用
IEICE TRANSACTIONS on Electronics
雑誌名
IEICE TRANSACTIONS on Electronics
発行年
2021-03-15
ISSN
17451353
DOI
10.1587/transele.2020ECS6026
権利
Copyright (C) 2021, IEICE
著者版フラグ
publisher
出版者
The Institute of Electronics, Information and Communication Engineers
Effects of oscillator phase noise on frequency delta sigma modulators with a high oversampling ratio for sensor applications
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