View Item 
      •   Home
      • 1. Schools
      • College of Engineering
      • School of Electrical and Electronic Engineering (EEE)
      • EEE Student Reports (FYP/IA/PA/PI)
      • View Item
      •   Home
      • 1. Schools
      • College of Engineering
      • School of Electrical and Electronic Engineering (EEE)
      • EEE Student Reports (FYP/IA/PA/PI)
      • View Item
      JavaScript is disabled for your browser. Some features of this site may not work without it.
      Subject Lookup

      Browse

      All of DR-NTUCommunities & CollectionsTitlesAuthorsBy DateSubjectsThis CollectionTitlesAuthorsBy DateSubjects

      My Account

      Login

      Statistics

      Most Popular ItemsStatistics by CountryMost Popular Authors

      About DR-NTU

      A low power, temperature-invariant frequency source

      Thumbnail
      FYP report_Tan Wei Lin_U1421617F_Final.pdf (3.315Mb)
      Author
      Tan, Wei Lin
      Date of Issue
      2017
      School
      School of Electrical and Electronic Engineering
      Related Organization
      DSO National Laboratories
      Abstract
      Clock signals are a necessity in most digital electronic systems to synchronise various parts of the integrated circuit. As a time reference, the clock signal’s frequency should be accurate and constant. Temperature invariance and power consumption are two key specifications for an on-chip oscillator. Using 65nm CMOS process, this paper proposes a low-power on-chip temperature-invariant clock of 0.24% frequency variation across -40°C to 125°C about 1 MHz, consuming 367uW at 3.3V supply voltage. Across three process corners, its largest frequency variance is 0.46% and its maximum power consumption is 471uW. The circuit is also supply-independent and resistor process-independent. The proposed design uses switched capacitors to track the output frequency of the oscillator. When the loop is in equilibrium, current through the switched capacitor will be equal to the reference current and the frequency of the oscillator reaches steady state. By designing the reference current to be constant with temperature, the oscillation frequency can be made less sensitive to temperature changes. If the frequency drifts, current through the switched capacitor changes, resulting in a net current flowing in or out of the integrator, whose output voltage controls the frequency of the oscillator. Through the negative feedback loop, the oscillator will be adjusted back to its equilibrium frequency.
      Subject
      DRNTU::Engineering::Electrical and electronic engineering
      Type
      Final Year Project (FYP)
      Rights
      Nanyang Technological University
      Collections
      • EEE Student Reports (FYP/IA/PA/PI)

      Show full item record


      NTU Library, Nanyang Avenue, Singapore 639798 © 2011 Nanyang Technological University. All rights reserved.
      DSpace software copyright © 2002-2015  DuraSpace
      Contact Us | Send Feedback
      Share |    
      Theme by 
      Atmire NV
       

       


      NTU Library, Nanyang Avenue, Singapore 639798 © 2011 Nanyang Technological University. All rights reserved.
      DSpace software copyright © 2002-2015  DuraSpace
      Contact Us | Send Feedback
      Share |    
      Theme by 
      Atmire NV
       

       

      DCSIMG