Low T Electronics Class Projects

1
Low T Electronics Class Projects

• Guofu Niu
• Alumni Professor
• Electrical and Computer Engineering Department
• Auburn University, Auburn AL 36830

2
Requirements

• An IEEE transactions paper style formal report on
  the subject of your choosing
• Professional analysis / graphics
• Complete reference information
• A 15 minute presentation
• Any software related files needed to repeat /
  evaluate your work.

3
Objectives

• Gain a better understanding of the temperature
  dependence of transistor or circuit
• Investigate a specific problem in transistor
  operation, modeling, or circuit design for
  operation down to 77K using the IBM 5HP or 5AM
  HBTs.

4
Temperature Dependent Modeling of Collector and
Base Currents down to 43K

• You have
• Ibm design kit to begin with (-55 to 120C
  calibrated) using VBIC model
• You need to
• Extract the IS and N factors for all T
• Evaluate the T dependence model in VBIC
• Come up with a new model for the T dependence
• Come up with parameter extraction method
• Implement your model in verilog-A
• Your goal
• Show better T-dependence modeling of Gummel
  curves
• Who
• Kejun, Xiaoyun, Zhiming, Kim

5
Temperature dependent calibration of Gummel /
Output for 5AM SiGe HBT

• You have
• An input profile / deck
• Some existing PMI model C files
• You need to
• Compare to data using default Dessis
• Understand the PMI models
• Understand ALL T dependences of mu, Nc/Nv, Eg and
  how to tune them to fit data
• Your Goals
• Calibrate Gummel for low and high injection
• Calibrate output (extra credit)
• Who Yan, Mutu, Kejun/2?