1 Tai-Cheng Lee Spring 2006 MOS Field-Effect Transistors (MOS) Tai-Cheng Lee Electrical Engineering/GIEE, NTU.

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Presentation transcript:

1 Tai-Cheng Lee Spring 2006 MOS Field-Effect Transistors (MOS) Tai-Cheng Lee Electrical Engineering/GIEE, NTU

2 Tai-Cheng Lee Spring 2006 MOS Introduction(1) MOSFET is CHEAP!!

3 Tai-Cheng Lee Spring 2006 MOS Introduction(2) MOSFET is CHEAP!!

4 Tai-Cheng Lee Spring 2006 MOS Channel Characteristics-(1) No gate voltage

5 Tai-Cheng Lee Spring 2006 MOS Channel Characteristics-(2) Small V gs and zero V ds

6 Tai-Cheng Lee Spring 2006 MOS Channel Characteristics-(3) Small V gs and small V ds

7 Tai-Cheng Lee Spring 2006 MOS Channel Characteristics-(4) Small V gs and V ds keep increasing

8 Tai-Cheng Lee Spring 2006 MOS Channel Characteristics-(5) Channel shape

9 Tai-Cheng Lee Spring 2006 MOS I d -V ds Characteristics-(1)

10 Tai-Cheng Lee Spring 2006 MOS I d -V ds Characteristics-(2)

11 Tai-Cheng Lee Spring 2006 PMOS and CMOS

12 Tai-Cheng Lee Spring 2006 Current-Voltage Relationship (1) Circuit symbol Cut-off Triode region

13 Tai-Cheng Lee Spring 2006 Current-Voltage Relationship (2) Saturation region Large-signal symbol Operation chart

14 Tai-Cheng Lee Spring 2006 MOS Output Resistance-(1) I d vs. V ds in saturation regsion

15 Tai-Cheng Lee Spring 2006 MOS Output Resistance-(2) Modified large-signal model

16 Tai-Cheng Lee Spring 2006 PMOS Characteristics PMOS symbol PMOS operation chart

17 Tai-Cheng Lee Spring 2006 Body Effect MOS is a four-terminal device

18 Tai-Cheng Lee Spring 2006 Temperature Effect

19 Tai-Cheng Lee Spring 2006 MOS Characteristic Summary

20 Tai-Cheng Lee Spring 2006 MOS Circuits at DC–(1) Figure out what region the MOS operate??

21 Tai-Cheng Lee Spring 2006 MOS Circuits at DC–(2) Ex 4.3

22 Tai-Cheng Lee Spring 2006 MOS Circuits at DC–(3) Ex 4.6

23 Tai-Cheng Lee Spring 2006 MOS as An Amplifier-(1) Saturated MOS is like a current source Large-signal operation

24 Tai-Cheng Lee Spring 2006 MOS as An Amplifier-(2)

25 Tai-Cheng Lee Spring 2006 MOS as An Amplifier-(3) Analytical analysis for the transfer curve

26 Tai-Cheng Lee Spring 2006 MOS as An Amplifier-(4) Different bias point

27 Tai-Cheng Lee Spring 2006 Biasing in MOS Amplifier-(1) by a fixed V GS

28 Tai-Cheng Lee Spring 2006 Biasing in MOS Amplifier-(2) by a fixed V GS and connecting a resistor in source

29 Tai-Cheng Lee Spring 2006 Biasing in MOS Amplifier-(3) example

30 Tai-Cheng Lee Spring 2006 Biasing in MOS Amplifier-(4) by a drain-to-gate FB resistor by a constant current source (current mirror)

31 Tai-Cheng Lee Spring 2006 Small-Signal Operation and Models-(1) DC bias point

32 Tai-Cheng Lee Spring 2006 Small-Signal Operation and Models-(2) Small-signal definition

33 Tai-Cheng Lee Spring 2006 Small-Signal Operation and Models-(3) Voltage gain

34 Tai-Cheng Lee Spring 2006 Small-Signal Operation and Models-(4) Small-signal model

35 Tai-Cheng Lee Spring 2006 Small-Signal Operation and Models-(5) Ex

36 Tai-Cheng Lee Spring 2006 T Equivalent Circuit Model-(1)

37 Tai-Cheng Lee Spring 2006 T Equivalent Circuit Model-(2) r o in T model Body effect

38 Tai-Cheng Lee Spring 2006 Single-Stage Amplifier

39 Tai-Cheng Lee Spring 2006 Amplifier Characterization-(1)

40 Tai-Cheng Lee Spring 2006 Amplifier Characterization-(2)

41 Tai-Cheng Lee Spring 2006 Common-Source (CS) Amplifier-(1) Small-signal model for CS amplifier

42 Tai-Cheng Lee Spring 2006 Common-Source (CS) Amplifier-(2) Small-signal analysis on CS amplifier schematic

43 Tai-Cheng Lee Spring 2006 Common-Source (CS) Amplifier-(3) CS amplifier with source degeneration

44 Tai-Cheng Lee Spring 2006 Common-Source (CS) Amplifier-(4) CS amplifier with source degeneration

45 Tai-Cheng Lee Spring 2006 Common-Gate (CG) Amplifier-(1)

46 Tai-Cheng Lee Spring 2006 Common-Gate (CG) Amplifier-(2) Current source input on CG amplifier

47 Tai-Cheng Lee Spring 2006 Common-Drain/Source Follower-(1)

48 Tai-Cheng Lee Spring 2006 Common-Drain/Source Follower-(2) Small-signal analysis on source follower schematic

49 Tai-Cheng Lee Spring 2006 MOS High-Frequency Equivalent Model MOS capacitance

50 Tai-Cheng Lee Spring 2006 MOS f t Unity current gain frequency

51 Tai-Cheng Lee Spring 2006 Frequency Response of CS Amplifier