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ECE 340 ELECTRONICS I MOS APPLICATIONS AND BIASING.

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Presentation on theme: "ECE 340 ELECTRONICS I MOS APPLICATIONS AND BIASING."— Presentation transcript:

1 ECE 340 ELECTRONICS I MOS APPLICATIONS AND BIASING

2 MOSFET REGIONS OF OPERATION CUT OFF LINEAR, OHMIC, TRIODE SATURATION

3 CUT OFF REGION OF OPERATION

4 LINEAR, OHMIC, TRIODE REGION OF OPERATION

5 SATURATION REGION OF OPERATION

6 MOSFET CHARACTERISTICS v DS 0V2V4V6V8V10V12V IDID 0mA 0.5mA 1.0mA 1.5mA v GS3 v GS2 v GS1 Linear, Ohmic, Triode ROP Saturation ROP Cutoff ROP

7 MOSFET BIASING SELECTION OF GATE TO SOURCE VOLTAGE PRODUCES DC DRAIN TO SOURCE VOLTAGE PRODUCES DC DRAIN CURRENT DEFINES REGION OF OPERATION

8 DC LOAD LINE INPUT DC BIAS EQUATION OUTPUT DC BIAS EQUATION LINEAR EQUATION WITH SLOPE DETERMINED BY EXTERNAL RESISTORS

9 MOSFET BIAS CIRCUIT

10 INPUT EQUATION SETS OR SELECTS DC GATE TO SOURCE VOLTAGE SETS OR SELECTS DC DRAIN CURRENT CONSTRUCTED BY PERFORMING KVL ON INPUT PORTION OF THE CIRCUIT

11 KVL INPUT EQUATION

12 OUTPUT EQUATION SELECTS OR SETS DC DRAIN TO SOURCE VOLTAGE SELECTS OR SETS DC DRAIN CURRENT CONSTRUCTED BY PERFORMING KVL ON OUTPUT PORTION OF THE CIRCUIT

13 KVL OUTPUT EQUATION

14 LOAD LINE EQUATION USED TO SELECT BIAS PARAMETERS V GS, V DS, AND I D.

15 v DS 0V2V4V6V8V10V12V IDID 0mA 0.5mA 1.0mA 1.5mA v GS3 v GS2 v GS1 Linear, Ohmic, Triode ROP Saturation ROP Cutoff ROP LOAD LINE

16 BIASING CIRCUITS USED TO ESTABLISH - V GG (GATE VOLTAGE) - I D (DRAIN CURRENT) -V DS (DRAIN TO SOURCE VOLTAGE) USES ONE OR TWO POWER SUPPLIES

17 USING TWO POWER SUPPLIES RDRD RSRS V DD V SS IDID + V DS -

18 DESIRED BIAS CONDITIONS

19 SELECTION OF R S

20 SELECTION OF R D

21 USING ONE POWER SUPPLY

22 DEVELOPMENT OF GATE VOLTAGE

23 INPUT AND OUTPUT EQUATIONS

24 DESIRED BIAS CONDITIONS

25 SELECTION OF R 1 AND R 2

26 SELECTION OF R S AND R D


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