Module 8: Learning Materials

Goal: Learn about the many types of oscillators

Readings:

• (scan through types of oscillators) Planar Microwave Circuits, by Lee chapter 15
• (scan through types of oscillators) Zoya Popovic Oscillator lecture notes Download Zoya Popovic Oscillator lecture notes

Additional resources:

• RF and Microwave Electronics Illustrated by Radmanesh ch17.pdf Download Radmanesh ch17.pdf 
• BJT Oscillators Links to an external site.

Homework:

Module 8a Assignment-- Oscillator types (10points) 

Readings:

• Read this section. We will be following Example 11.9 in class.
  • Microwave Engineering, by Pozar Ch 11_5.pdf Download Pozar Ch 11_5.pdf and Pozar HW ch11.pdf Download Pozar HW ch11.pdf 
• This describes how S parameters can be converted between different transistor configurations:
  • RF and Microwave Communication Circuits by Misra ch12_7.pdf Download Misra ch12_7.pdf
• Here's another explanation of how to do the oscillator design:
  • RF and Microwave Electronics Illustrated by Radmanesh ch17.pdf Download Radmanesh ch17.pdf 
• This has several additional examples:
  • Microwave Transistor Amplifiers by Gonzalez  Gonzales ch5_3.pdf Download Gonzales ch5_3.pdf
• Here's a deeper dive into the math, including the factor of 3 used in the ZL calculation:
  • Jensen and Warnick http://ece464web.groups.et.byu.net/notes/ln44_58.pdf Links to an external site.

In class materials:

We'll be working through example 11.9 in Pozar Ch 11_5.pdf Download Pozar Ch 11_5.pdf

• oscillators 1.ppt Download oscillators 1.ppt 
• oscillator.m Download oscillator.m 
• S-parameter files
  • Ex11_9.s2p Download Ex11_9.s2p 
  • Ex11_9_Sprime.s2p Download Ex11_9_Sprime.s2p 

homework:

Module 8b Assignment-- Transistor Oscillator Design (30points)  

• Feedback Oscillator basics
  
  • Video:The working principle of the oscillator explained

https://www.youtube.com/watch?v=XVS8Puf4tiw Links to an external site.

• • Readings:
    • RF and Microwave Communication Circuits by Misra chapter 12.1 (pp. 479-484) (Especially note the different locations the resonator can be placed in the generalized oscillator design.)
    • Barkhausen stability criterion   Links to an external site.(necessary but not sufficient criterion for oscillation)
• LC Resonator basics
  • Video: Colpitts Oscillator Explained

https://www.youtube.com/watch?v=1fgw-ONlAcc Links to an external site.

• • Reading: See several different LC configurations ( there are so many different ways to arrange the LC resonators)
    • section 17.5.1 (pp. 583-586) Radmanesh ch17.pdf Download Radmanesh ch17.pdf 
    • Gonzales ch5_5.pdf Download Gonzales ch5_5.pdf 
    • Misra chapter 12_1.pdf Download Misra chapter 12_1.pdf 
    • LudwigBretchko ch10_1.pdf Download LudwigBretchko ch10_1.pdf 
• Colpitts Oscillator:
  • Video (see above) and
    
    • Colpitts Oscillator Design

https://www.youtube.com/watch?v=BXcJxeEQo-M Links to an external site.

• • • Colpitts Oscillator BJT Circuit example

https://www.youtube.com/watch?v=z761q6rk-tw Links to an external site.

• •  Readings:
    • Simple Colpitts Design https://www.petervis.com/Education/colpitts-oscillator/colpitts-oscillator-design.html Links to an external site.
    • RF and Microwave Communication Circuits by Misra chapter 12.1 (pp. 484-489)
    • Planar Microwave Engineering by Lee, chapters 15.3.3 and 15.3.4
    • Colpitts with LC tank circuit Links to an external site.
    • Colpitts another explanation Links to an external site.
  • Example in Class
    • oscillators 2 colpitts and Hartley.ppt Download oscillators 2 colpitts and Hartley.ppt 
    • Gonzalez bias networks.pdf Download Gonzalez bias networks.pdf
    • colpitts.m Download colpitts.m 
• Hartley Oscillator
  • Video: Hartley Oscillator Circuit 

https://www.youtube.com/watch?v=3B_sBX_11Zw Links to an external site.

• • Readings:
    • • Hartley oscillator with LC tank on the input side of the transistor amplifier Links to an external site.

Homework:

Module 8c Assignment-- Hartley Oscillator Design (30points)  

• Review: Varactor Diodes
  
  • Video:

https://www.youtube.com/watch?v=icw8terKP-M Links to an external site. Links to an external site.

• VCO Basics
  • Video

https://www.youtube.com/watch?v=EeYL6lJsNT8 Links to an external site.

• • Applications of VCOs Links to an external site.
• Resonant circuits with Varactor diodes
  • See Figs 5-45, 5.54 and 5-55 in VCO Rhode Newkirk.pdf Download VCO Rhode Newkirk.pdf 
  • Design of Colpitts Oscillator with varactor VCO Ludwig Bretchko.pdf Download VCO Ludwig Bretchko.pdf 
  • Design of negative resistance oscillator with varactor diode VCO Gonzalez.pdf Download VCO Gonzalez.pdf

Supplementary Material

• Several other VCO configurations Links to an external site.
•  Details of several commercial VCO circuits, and more details on VCO parameters VCO Rhode Newkirk.pdf Download VCO Rhode Newkirk.pdf 
• Another look at Varactor tuned circuits VCO Radmanesh.pdf Download VCO Radmanesh.pdf and VCO Misra.pdf Download VCO Misra.pdf