1. Smith chart
Nonideal effects

2. Do over exam #1

3. frequency analysis of a parallel resonant circuit – R = 0; L & C = 1

4. frequency analysis of a series resonant circuit – R = 0 & 0
frequency analysis of a series resonant circuit – R = 0 & 0.5; L & C = 1

5. Application of the Smith chart
Application of the Smith chart. Transistor circuit – frequency analysis Richard Percifield

6. Model Equation

7. Transistor Parameters
LT = 20nH
rbb’ = 50 ohms
rb’e = 1000 ohms
CT = 100pF
Znorm=100 ohms
Frequency Range DC to 600MHz

9. Input Z vs. Frequency Matlab Makes the Plotting Easy!
Towbar a

10. Instability Circles

11. Important changes in the MOSFET
Moore’s Law (Intel Corp. cofounder) The number of active elements on a chip doubles every 18 months.

12. Important changes in the MOSFET
Assume constant electric field scaling!

13. Important changes in the MOSFET

14. Important changes in the MOSFET

15. Important changes in the MOSFET
Material determination
weak dependence on k

16. Problem in changing the MOSFET
We will not change our old power supplies. Do not, I repeat, do not change the voltage supplies so often.
Consequences
electric fields increase in value.
2) reduced reliability.
3) heating

17. Nonideal defects in the MOSFET
Laboratory experiment

18. Modulate the channel length of the MOSFET

19. Modulate the channel length of the MOSFET

20. Modulate the channel length of the MOSFET
Electron mobility is a function of the electric field and the temperature.

21. Ideal MOSFET
Long channel G V
Space charge regions
Flatband

22. Ideal MOSFET
Short channel G V
Space charge regions
Flatband

23. Ideal MOSFET G V

24. Ideal MOSFET V As L decreases, inversion channel becomes
a depletion layer G V

25. Important changes in the MOSFET
Material determination
weak dependence on
the change of the dimension k

26. Important changes in the MOSFET

27. Important changes in the MOSFET

28. Summary of changes in a MOSFET

29. Asymmetric MOSFET
Short channel G V G V
Space charge regions
Flatband

30. Picture from Saturn

32. Simple three-dimensional unit cell