A 1.8 V 18.13 MHz Inverter-Based On-Chip RC Oscillator with Flicker Noise Suppression Using Logic Transition Voltage Feedback

A 1.8 V 18.13 MHz Inverter-Based On-Chip RC Oscillator with Flicker Noise Suppression Using Logic Transition Voltage Feedback

An inverter-based on-chip resistor capacitor (RC) oscillator with logic transition voltage (LTV) tracking feedback for circuit delay compensation is presented. In order to achieve good frequency stability, the proposed technique considers the entire inverter chain as a comparator block and changes t...

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Main Authors: Junsoo Ko, Minjae Lee
Format: Article
Language:English
Published: MDPI AG 2019-11-01
Series:Electronics
Subjects:
rc on-chip oscillator
low phase noise
inverter-based
logic transition voltage tracking
Online Access:https://www.mdpi.com/2079-9292/8/11/1353
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spelling doaj-1857bd1f454c4d559cc38cae52f263242020-11-25T01:50:24ZengMDPI AGElectronics2079-92922019-11-01811135310.3390/electronics8111353electronics8111353A 1.8 V 18.13 MHz Inverter-Based On-Chip RC Oscillator with Flicker Noise Suppression Using Logic Transition Voltage FeedbackJunsoo Ko0Minjae Lee1School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, Gwangju 61005, KoreaSchool of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, Gwangju 61005, KoreaAn inverter-based on-chip resistor capacitor (RC) oscillator with logic transition voltage (LTV) tracking feedback for circuit delay compensation is presented. In order to achieve good frequency stability, the proposed technique considers the entire inverter chain as a comparator block and changes the LTV to control the oscillation frequency. Furthermore, the negative feedback structure also reduces low-frequency offset phase noise. With a 1.8 V supply and at room temperature, the suggested oscillator operates at 18.13 MHz, consuming 245.7 <inline-formula> <math display="inline"> <semantics> <mi mathvariant="sans-serif">&#956;</mi> </semantics> </math> </inline-formula>W. Compared to the free-running case, the proposed technique reduces phase noise by 7.7 dB and 5.45 dB at 100 Hz and 1 kHz, respectively. The measured phase noise values are &#8722;60.09 dBc/Hz at 1 kHz with a figure of merit (FOM) of 151.35 dB/Hz, and &#8722;106.27 dBc/Hz at 100 KHz with an FOM of 157.53 dBc/Hz. The proposed oscillator occupies 0.056 mm<sup>2</sup> in a standard 0.18 <inline-formula> <math display="inline"> <semantics> <mi mathvariant="sans-serif">&#956;</mi> </semantics> </math> </inline-formula>m CMOS process.https://www.mdpi.com/2079-9292/8/11/1353rc on-chip oscillatorlow phase noiseinverter-basedlogic transition voltage tracking
collection DOAJ
language English
format Article
sources DOAJ
author Junsoo Ko
Minjae Lee
spellingShingle Junsoo Ko
Minjae Lee
A 1.8 V 18.13 MHz Inverter-Based On-Chip RC Oscillator with Flicker Noise Suppression Using Logic Transition Voltage Feedback
Electronics
rc on-chip oscillator
low phase noise
inverter-based
logic transition voltage tracking
author_facet Junsoo Ko
Minjae Lee
author_sort Junsoo Ko
title A 1.8 V 18.13 MHz Inverter-Based On-Chip RC Oscillator with Flicker Noise Suppression Using Logic Transition Voltage Feedback
title_short A 1.8 V 18.13 MHz Inverter-Based On-Chip RC Oscillator with Flicker Noise Suppression Using Logic Transition Voltage Feedback
title_full A 1.8 V 18.13 MHz Inverter-Based On-Chip RC Oscillator with Flicker Noise Suppression Using Logic Transition Voltage Feedback
title_fullStr A 1.8 V 18.13 MHz Inverter-Based On-Chip RC Oscillator with Flicker Noise Suppression Using Logic Transition Voltage Feedback
title_full_unstemmed A 1.8 V 18.13 MHz Inverter-Based On-Chip RC Oscillator with Flicker Noise Suppression Using Logic Transition Voltage Feedback
title_sort 1.8 v 18.13 mhz inverter-based on-chip rc oscillator with flicker noise suppression using logic transition voltage feedback
publisher MDPI AG
series Electronics
issn 2079-9292
publishDate 2019-11-01
description An inverter-based on-chip resistor capacitor (RC) oscillator with logic transition voltage (LTV) tracking feedback for circuit delay compensation is presented. In order to achieve good frequency stability, the proposed technique considers the entire inverter chain as a comparator block and changes the LTV to control the oscillation frequency. Furthermore, the negative feedback structure also reduces low-frequency offset phase noise. With a 1.8 V supply and at room temperature, the suggested oscillator operates at 18.13 MHz, consuming 245.7 <inline-formula> <math display="inline"> <semantics> <mi mathvariant="sans-serif">&#956;</mi> </semantics> </math> </inline-formula>W. Compared to the free-running case, the proposed technique reduces phase noise by 7.7 dB and 5.45 dB at 100 Hz and 1 kHz, respectively. The measured phase noise values are &#8722;60.09 dBc/Hz at 1 kHz with a figure of merit (FOM) of 151.35 dB/Hz, and &#8722;106.27 dBc/Hz at 100 KHz with an FOM of 157.53 dBc/Hz. The proposed oscillator occupies 0.056 mm<sup>2</sup> in a standard 0.18 <inline-formula> <math display="inline"> <semantics> <mi mathvariant="sans-serif">&#956;</mi> </semantics> </math> </inline-formula>m CMOS process.
topic rc on-chip oscillator
low phase noise
inverter-based
logic transition voltage tracking
url https://www.mdpi.com/2079-9292/8/11/1353
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