A 0.5 V modified pseudo-differential current-starved ring-VCO with linearity improvement for IoT devices

Name: Pitchayapatchaya Srikram

Organization : Hokkaido University. Graduate School of Information Science and Technology

Name: Prasoon Ambalathankandy

Organization : Hokkaido University. Research Center For Integrated Quantum Electronics

Name: Motomura, Masato

Organization : Tokyo Institute of Technology. Institute of Innovative Research

Name: Ikebe, Masayuki

Organization : Hokkaido University. Research Center For Integrated Quantum Electronics

keyword: Current-starved ring-VCO

ThaSH: Differential equations, Partial

; Low supply voltage

ThaSH: Partial differential operators

Abstract: Ring-VCO (Voltage controlled oscillator)-based ADCs are suitable for data acquisition in IoT devices due to simple delay elements configuration in the chain. The future development of IoT devices will be directed towards ultralow operating voltage and reduce their size and area cost. However, the low operating voltage further degrades the linear voltage-to-frequency (V-to-F) tuning characteristics of ring-VCO. The ring-VCO based on complementary bias voltage controls approach achieved the linear V-to-F tuning characteristic at sub- /near threshold operating voltage. The ring-VCO relied on the current-starved pseudo-differential ring-VCO configuration in which a huge number of transistors occupied one delay element. This paper presents the novel current-starved pseudo-differential delay element, which has decreased overhead transistors by 37.5 percent and sizing by 44.88 percent compared with the previous work while not adversely affecting the linearity of V-to-F tuning characteristic. Simulation results with a 0.5V operating circuit designed in TSMC 0.18μm CMOS technology shows that the maximum nonlinearity error is below 1.3 percent for 4-stage and phase noise is 95.01dBc/Hz at 1MHz offset frequency.

King Mongkut's University of Technology North Bangkok. Central Library

Address: BANGKOK

Email: library@kmutnb.ac.th

Created: 2023

Modified: 2024-12-06

Issued: 2024-12-06

บทความ/Article

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BibliograpyCitation : In Electrical Engineering Academic Association (Thailand), Mahasarakham University. Faculty of Engineering and ASEFA. The 2023 International Electrical Engineering Congress (iEECON 2023) (pp.219-223). Mahasarakham : Mahasarakham University

eng

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