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2024 | OriginalPaper | Buchkapitel

Design of a Low-Power Varactor-Based DCO Using NMOS Switching Network as a Digital Control Technique

verfasst von : Shweta Dabas, Manoj Kumar

Erschienen in: Evolution in Signal Processing and Telecommunication Networks

Verlag: Springer Nature Singapore

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Abstract

This paper introduces a new design of a varactor-based Digitally Controlled Oscillator (DCO). The hybrid ring-type DCO is designed using three different delay stages. Each delay stage consists of a varactor-based load element which is controlled digitally using an NMOS-based switching network. A 4-bit three-stage DCO and a 4-bit five-stage DCO have been designed, both utilizing the MOS varactor as a load element. The 4-bit three-stage DCO exhibits a frequency variation from 2.092 to 1.750 GHz while consuming 0.643 mW of power. In the case of a 4-bit five-stage DCO, the output frequency is in the range of 1.080–0.920 GHz, accompanied by a power consumption of 1.099 mW. The control bits are systematically changed from [0000] to [1111]. The effects of varying supply voltage on the output frequency and power consumption are also measured and recorded. Results are obtained in TSMC 0.18 µm CMOS process technology.

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Literatur
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Zurück zum Zitat Pokharel RK, Tomar A, Kanaya H, Yoshida K (2008) Design of highly linear: 1 GHz 8-bit digitally controlled ring oscillator with wide tuning range in 0.18 μm CMOS process. In: 2008 China–Japan joint microwave conference, Shanghai, China, pp 623–626. https://doi.org/10.1109/CJMW.2008.4772508 Pokharel RK, Tomar A, Kanaya H, Yoshida K (2008) Design of highly linear: 1 GHz 8-bit digitally controlled ring oscillator with wide tuning range in 0.18 μm CMOS process. In: 2008 China–Japan joint microwave conference, Shanghai, China, pp 623–626. https://​doi.​org/​10.​1109/​CJMW.​2008.​4772508
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Zurück zum Zitat Tomar A, Pokharel RK, Nizhnik O, Kanaya H, Yoshida K (2007) Design of 1.1 GHz highly linear digitally-controlled ring oscillator with wide tuning range. In: IEEE international workshop on radio-frequency integration technology, Singapore, pp 82–85. https://doi.org/10.1109/RFIT.2007.4443926 Tomar A, Pokharel RK, Nizhnik O, Kanaya H, Yoshida K (2007) Design of 1.1 GHz highly linear digitally-controlled ring oscillator with wide tuning range. In: IEEE international workshop on radio-frequency integration technology, Singapore, pp 82–85. https://​doi.​org/​10.​1109/​RFIT.​2007.​4443926
Metadaten
Titel
Design of a Low-Power Varactor-Based DCO Using NMOS Switching Network as a Digital Control Technique
verfasst von
Shweta Dabas
Manoj Kumar
Copyright-Jahr
2024
Verlag
Springer Nature Singapore
DOI
https://doi.org/10.1007/978-981-97-0644-0_13

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