Ultra Low Power Temperature Compensated Complementary Metal Oxide Semiconductor Ring Oscillator in Subthreshold
Publish Year: 1402
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_IJE-36-1_020
تاریخ نمایه سازی: 24 دی 1401
Abstract:
Low power consumption, low chip area and fabrication in the standard complementary metal oxide semiconductor (CMOS) process are vital requirements for oscillators used in low-cost bio-implantable and wearable devices. Conventional ring oscillators (ROs) are good candidates for using in biomedical applications. However, their oscillation frequency strongly depends on the temperature. In this study, a temperature compensated ring oscillator with low power consumption is proposed. The transistors of the proposed ring oscillator operate in the subthreshold region to achieve a low power and low voltage performance. Since, in the subthreshold region, the oscillation frequency of a conventional ring oscillator increases with increase in the temperature, two current sources are used to power the proposed subthreshold ring oscillator: a temperature independent current source and a complementary to absolute temperature (CTAT) current source. In the proposed circuit, the CTAT current forms a small part of the total supplied current and its duty is to compensate for the oscillation frequency deviation. Two prototypes of the subthreshold ring oscillator were designed and simulated for a target frequency of ۱MHz using commercially available ۰.۱۸µm RF-CMOS technology. The thermal coefficient (TC) of the uncompensated ring oscillator was ۲۴۰۰ ppm/ºC from -۴۰ºC to ۸۵ºC, though applying the proposed technique reduces the TC of the ring oscillator to ۸۰.۴ ppm/ºC with total power consumption as low as ۱۴.۵µW.
Keywords:
Complementary to Absolute Temperature , Current Reference Ring Oscillator , Subthreshold , Thermal Compensation
Authors
E. Sadeghi
IC Design Research Laboratory, Electrical & Robotic Engineering Department, Shahrood University of Technology, Shahrood, Iran
E. Ebrahimi
IC Design Research Laboratory, Electrical & Robotic Engineering Department, Shahrood University of Technology, Shahrood, Iran
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