NDLI: Crystal-less oscillator calibration using serial data as frequency reference

Content Provider	IET Digital Library
Author	Yang, Wendi Jiang, Hanjun Wang, Zhihua
Abstract	A frequency calibration method for a crystal-less current-controlled ring oscillator is presented. It uses a serial data signal from another chip as the frequency reference. The proposed calibration circuit is composed of the coarse calibration and the fine calibration circuit. The coarse calibration circuit controls a binary weighted biasing current source array, while the fine calibration circuit generates a pulse-width-modulation (PWM) signal to control a switched biasing current source. The duty cycle ratio of the PWM signal is obtained by measuring the frequency ratio error between the oscillator output and the reference signal. An auto-correlation-based method is proposed to calculate the frequency ratio error. The 8 MHz ring oscillator in together with the calibration circuit has been fabricated in a 0.13 μm CMOS process. Measured results on 24 chips show that the relative frequency error is reduced to 0.0239% (mean offset + 3σ) after calibration. The reported oscillator shows advantages in accuracy, power consumption and chip area.
Starting Page	967
Ending Page	968
Page Count	2
ISSN	00135194
Volume Number	54
e-ISSN	1350911X
Issue Number	Issue 16, Aug (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/el/54/16
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/el.2018.1216
Journal	Electronics Letters
Publisher Date	2018-07-09
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Active Filter Active Network Auto-correlation-based Method Binary Weighted Biasing Current Source Array Calibration Calibration Circuit Chip Area CMOS Integrated Circuit CMOS Process Correlation Method Crystal-less Current-controlled Ring Oscillator Crystal-less Oscillator Calibration Frequency 8 MHz Frequency Calibration Method Frequency Ratio Error Frequency Reference Measurement Standard And Calibration Oscillator Power Consumption Pulse-width-modulation Signal PWM Signal Radiofrequency Oscillator Relative Frequency Error Serial Data Signal Size 0.13 Mum Switched Biasing Current Source
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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