University of SaskatchewanHARVEST
  • Login
  • Submit Your Work
  • About
    • About HARVEST
    • Guidelines
    • Browse
      • All of HARVEST
      • Communities & Collections
      • By Issue Date
      • Authors
      • Titles
      • Subjects
      • This Collection
      • By Issue Date
      • Authors
      • Titles
      • Subjects
    • My Account
      • Login
      JavaScript is disabled for your browser. Some features of this site may not work without it.
      View Item 
      • HARVEST
      • Electronic Theses and Dissertations
      • Graduate Theses and Dissertations
      • View Item
      • HARVEST
      • Electronic Theses and Dissertations
      • Graduate Theses and Dissertations
      • View Item

      OSCILLATION AND SWITCHING IN TUNNEL DIODES

      Thumbnail
      View/Open
      Mahabala_Hosakere_N_1964_sec.pdf (14.71Mb)
      Date
      1964-07
      Author
      Mahabala, Hosakere N.
      Type
      Thesis
      Degree Level
      Masters
      Metadata
      Show full item record
      Abstract
      The studycovers a wide range of topics in the field of negative resistances. Generalized stability criteria based on the index principle, of which Nyquist's criterion is a special case which uses the driving point impedance (or admittance) functions (calculated or measured) have been developed. The criteria and an examination into the methods of generating negative resistance justify the two different types of simplified small signal equivalent circuits for the current and voltage controlled negative resistances. The construction of a current controlled negative resistance analog is described. The principle of duality and the availability of both current and voltage controlled analogs make a unified approach to the study of negative resistance circuits a possibility. A good prediction for the limit cycle (steady state frequency and amplitude) for a simple tunnel diode oscillator has been obtained by using the Kryloff and Bogoliuboff tech­nique. The oscillation hysterisis has also been discussed. Well-known methods of nonlinear analysis such as piece­ wise linearization, graphical, isocline, analogue and digital computer techniques have been adopted for solving nonlinear differential equations met with in tunnel diode circuits. The fundamental aspect of switching in all multi-stable systems, namely the separatrix which is the boundary between the various domains has been studied for the case of switching of a tunnel diode when the lead inductance is not negligible. The final value problem of determining the separatrix has been converted to an initial value problem by making time go backwards. The plot of separatrices for both linear and nonlinear loads obtained on a digital computer has provided insight into the role of inductance in minimizing trigger requirements and in the operation of some elegant tunnel diode switching circuits. In general, the inductance bends the separatrix (which is a vertical line through the cross­over point for zero lead inductance) towards the stable points, thereby reducing trigger (current or voltage amplitude) requirements.
      Degree
      Doctor of Philosophy (Ph.D.)
      Department
      Electrical and Computer Engineering
      Program
      Electrical Engineering
      Supervisor
      Cobbold, R. S. C.
      Copyright Date
      July 1964
      URI
      http://hdl.handle.net/10388/11735
      Collections
      • Graduate Theses and Dissertations
      University of Saskatchewan

      University Library

      © University of Saskatchewan
      Contact Us | Disclaimer | Privacy