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ECE 340 ELECTRONICS I. MOS APPLICATIONS AND BIASING. MOSFET REGIONS OF OPERATION. CUT OFF LINEAR, OHMIC, TRIODE SATURATION. CUT OFF REGION OF OPERATION. LINEAR, OHMIC, TRIODE REGION OF OPERATION. SATURATION REGION OF OPERATION. MOSFET CHARACTERISTICS. 1.5mA. I D. 1.0mA. v GS3.

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ece 340 electronics i

ECE 340ELECTRONICS I

MOS

APPLICATIONS AND BIASING

mosfet regions of operation
MOSFET REGIONS OF OPERATION
  • CUT OFF
  • LINEAR, OHMIC, TRIODE
  • SATURATION
mosfet characteristics
MOSFET CHARACTERISTICS

1.5mA

ID

1.0mA

vGS3

Linear, Ohmic,

Triode ROP

Saturation ROP

vGS2

0.5mA

vGS1

Cutoff ROP

0mA

0V

2V

4V

6V

8V

10V

12V

vDS

mosfet biasing
MOSFET BIASING
  • SELECTION OF GATE TO SOURCE VOLTAGE
  • PRODUCES DC DRAIN TO SOURCE VOLTAGE
  • PRODUCES DC DRAIN CURRENT
  • DEFINES REGION OF OPERATION
dc load line
DC LOAD LINE
  • INPUT DC BIAS EQUATION
  • OUTPUT DC BIAS EQUATION
  • LINEAR EQUATION WITH SLOPE DETERMINED BY EXTERNAL RESISTORS
mosfet bias circuit

VDD

ID

ID

RD

RD

+

+

VDS

VDD

VDS

VGG

+

+

-

-

VGS

VGS

VGG

-

-

RS

RS

MOSFET BIAS CIRCUIT
input equation
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
output equation
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
load line equation
LOAD LINE EQUATION
  • USED TO SELECT BIAS PARAMETERS VGS, VDS, AND ID.
slide15

ID

1.5mA

vGS3

1.0mA

Linear, Ohmic,

Triode ROP

Saturation ROP

LOAD LINE

vGS2

0.5mA

vGS1

Cutoff ROP

0mA

0V

2V

4V

6V

8V

10V

12V

vDS

biasing circuits
BIASING CIRCUITS
  • USED TO ESTABLISH

- VGG (GATE VOLTAGE)

- ID (DRAIN CURRENT)

-VDS (DRAIN TO SOURCE VOLTAGE)

  • USES ONE OR TWO POWER SUPPLIES
using one power supply

VDD

IX

ID

IX

ID

R1

RD

R1

RD

+

+

VDD

IG = 0

IG = 0

VDS

VDS

+

+

-

+

+

-

VGS

VGS

-

-

VGG

R2

RS

VGG

R2

RS

-

-

USING ONE POWER SUPPLY