JFET Biasing ELEC 121. January 2004ELEC 1212 JFET Fixed Bias R G is present to limit current in case...
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Transcript of JFET Biasing ELEC 121. January 2004ELEC 1212 JFET Fixed Bias R G is present to limit current in case...
![Page 1: JFET Biasing ELEC 121. January 2004ELEC 1212 JFET Fixed Bias R G is present to limit current in case V GG is connected with wrong polarity This would.](https://reader035.fdocuments.net/reader035/viewer/2022081514/5697bfef1a28abf838cba204/html5/thumbnails/1.jpg)
JFET Biasing
ELEC 121
![Page 2: JFET Biasing ELEC 121. January 2004ELEC 1212 JFET Fixed Bias R G is present to limit current in case V GG is connected with wrong polarity This would.](https://reader035.fdocuments.net/reader035/viewer/2022081514/5697bfef1a28abf838cba204/html5/thumbnails/2.jpg)
January 2004 ELEC 121 2
JFET Fixed Bias
RG is present to limit current in case VGG is connected with wrong polarityThis would forward bias the gate-source junction causing high currents, which would destroy the transistor
Since GS is reverse biased, IG = 0 and VRG = 0
GS
GG G G
GG
GS
G
V + I R + V = 0
Sin
V = -
ce I =
V
0
![Page 3: JFET Biasing ELEC 121. January 2004ELEC 1212 JFET Fixed Bias R G is present to limit current in case V GG is connected with wrong polarity This would.](https://reader035.fdocuments.net/reader035/viewer/2022081514/5697bfef1a28abf838cba204/html5/thumbnails/3.jpg)
January 2004 ELEC 121 3
DC Analysis for JFET Fixed Bias Network
2GS
D DSSP
VI = I 1 -
V
GS GGV = - V
![Page 4: JFET Biasing ELEC 121. January 2004ELEC 1212 JFET Fixed Bias R G is present to limit current in case V GG is connected with wrong polarity This would.](https://reader035.fdocuments.net/reader035/viewer/2022081514/5697bfef1a28abf838cba204/html5/thumbnails/4.jpg)
January 2004 ELEC 121 4
JFET Fixed Bias Plotting Shockley’s Equation
![Page 5: JFET Biasing ELEC 121. January 2004ELEC 1212 JFET Fixed Bias R G is present to limit current in case V GG is connected with wrong polarity This would.](https://reader035.fdocuments.net/reader035/viewer/2022081514/5697bfef1a28abf838cba204/html5/thumbnails/5.jpg)
January 2004 ELEC 121 5
JFET Fixed Bias Graphical Solution
GS GG
2GS
D DSSP
2GG
D DSSP
Since V = - V
V I = I 1 -
V
V I = I 1 -
V
![Page 6: JFET Biasing ELEC 121. January 2004ELEC 1212 JFET Fixed Bias R G is present to limit current in case V GG is connected with wrong polarity This would.](https://reader035.fdocuments.net/reader035/viewer/2022081514/5697bfef1a28abf838cba204/html5/thumbnails/6.jpg)
January 2004 ELEC 121 6
JFET Fixed Bias
![Page 7: JFET Biasing ELEC 121. January 2004ELEC 1212 JFET Fixed Bias R G is present to limit current in case V GG is connected with wrong polarity This would.](https://reader035.fdocuments.net/reader035/viewer/2022081514/5697bfef1a28abf838cba204/html5/thumbnails/7.jpg)
January 2004 ELEC 121 7
Graphical Solution for JFET Fixed Bias
2GS
D DSSP
2GG
D DSSP
V I = I 1 -
V
V I = I 1 -
V
![Page 8: JFET Biasing ELEC 121. January 2004ELEC 1212 JFET Fixed Bias R G is present to limit current in case V GG is connected with wrong polarity This would.](https://reader035.fdocuments.net/reader035/viewer/2022081514/5697bfef1a28abf838cba204/html5/thumbnails/8.jpg)
January 2004 ELEC 121 8
JFET Self Bias Configuration
![Page 9: JFET Biasing ELEC 121. January 2004ELEC 1212 JFET Fixed Bias R G is present to limit current in case V GG is connected with wrong polarity This would.](https://reader035.fdocuments.net/reader035/viewer/2022081514/5697bfef1a28abf838cba204/html5/thumbnails/9.jpg)
January 2004 ELEC 121 9
JFET Self Bias DC Equivalent Circuit
VRG = 0
IG = 0
![Page 10: JFET Biasing ELEC 121. January 2004ELEC 1212 JFET Fixed Bias R G is present to limit current in case V GG is connected with wrong polarity This would.](https://reader035.fdocuments.net/reader035/viewer/2022081514/5697bfef1a28abf838cba204/html5/thumbnails/10.jpg)
January 2004 ELEC 121 10
Transconductance Curve
![Page 11: JFET Biasing ELEC 121. January 2004ELEC 1212 JFET Fixed Bias R G is present to limit current in case V GG is connected with wrong polarity This would.](https://reader035.fdocuments.net/reader035/viewer/2022081514/5697bfef1a28abf838cba204/html5/thumbnails/11.jpg)
January 2004 ELEC 121 11
JFET Self Bias Load Line
![Page 12: JFET Biasing ELEC 121. January 2004ELEC 1212 JFET Fixed Bias R G is present to limit current in case V GG is connected with wrong polarity This would.](https://reader035.fdocuments.net/reader035/viewer/2022081514/5697bfef1a28abf838cba204/html5/thumbnails/12.jpg)
January 2004 ELEC 121 12
JFET Self Bias
![Page 13: JFET Biasing ELEC 121. January 2004ELEC 1212 JFET Fixed Bias R G is present to limit current in case V GG is connected with wrong polarity This would.](https://reader035.fdocuments.net/reader035/viewer/2022081514/5697bfef1a28abf838cba204/html5/thumbnails/13.jpg)
January 2004 ELEC 121 13
JFET Self Bias Transconductance Curve
![Page 14: JFET Biasing ELEC 121. January 2004ELEC 1212 JFET Fixed Bias R G is present to limit current in case V GG is connected with wrong polarity This would.](https://reader035.fdocuments.net/reader035/viewer/2022081514/5697bfef1a28abf838cba204/html5/thumbnails/14.jpg)
January 2004 ELEC 121 14
Graphical Solution of JFET Self Bias
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January 2004 ELEC 121 15
JFET Self Bias Effect on Variation of RS
![Page 16: JFET Biasing ELEC 121. January 2004ELEC 1212 JFET Fixed Bias R G is present to limit current in case V GG is connected with wrong polarity This would.](https://reader035.fdocuments.net/reader035/viewer/2022081514/5697bfef1a28abf838cba204/html5/thumbnails/16.jpg)
January 2004 ELEC 121 16
Self Bias
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January 2004 ELEC 121 17
JFET Voltage Divider Bias
![Page 18: JFET Biasing ELEC 121. January 2004ELEC 1212 JFET Fixed Bias R G is present to limit current in case V GG is connected with wrong polarity This would.](https://reader035.fdocuments.net/reader035/viewer/2022081514/5697bfef1a28abf838cba204/html5/thumbnails/18.jpg)
January 2004 ELEC 121 18
JFET Voltage Divider Bias DC Analysis
Input Output
2G DD
1 2
R V = V
R + R DS DD D D SV = V - I (R + R )G D G GS D S
GS G D S
-V + I R + V + I R = 0
V = V - I R
![Page 19: JFET Biasing ELEC 121. January 2004ELEC 1212 JFET Fixed Bias R G is present to limit current in case V GG is connected with wrong polarity This would.](https://reader035.fdocuments.net/reader035/viewer/2022081514/5697bfef1a28abf838cba204/html5/thumbnails/19.jpg)
January 2004 ELEC 121 19
JFET Voltage Divider Bias Load Line
![Page 20: JFET Biasing ELEC 121. January 2004ELEC 1212 JFET Fixed Bias R G is present to limit current in case V GG is connected with wrong polarity This would.](https://reader035.fdocuments.net/reader035/viewer/2022081514/5697bfef1a28abf838cba204/html5/thumbnails/20.jpg)
January 2004 ELEC 121 20
The Effect of RS on Q-point
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January 2004 ELEC 121 21
JFET Voltage Divider Bias
![Page 22: JFET Biasing ELEC 121. January 2004ELEC 1212 JFET Fixed Bias R G is present to limit current in case V GG is connected with wrong polarity This would.](https://reader035.fdocuments.net/reader035/viewer/2022081514/5697bfef1a28abf838cba204/html5/thumbnails/22.jpg)
January 2004 ELEC 121 22
JFET Voltage Divider Bias Q-point
![Page 23: JFET Biasing ELEC 121. January 2004ELEC 1212 JFET Fixed Bias R G is present to limit current in case V GG is connected with wrong polarity This would.](https://reader035.fdocuments.net/reader035/viewer/2022081514/5697bfef1a28abf838cba204/html5/thumbnails/23.jpg)
January 2004 ELEC 121 23
Voltage Divider Bias
![Page 24: JFET Biasing ELEC 121. January 2004ELEC 1212 JFET Fixed Bias R G is present to limit current in case V GG is connected with wrong polarity This would.](https://reader035.fdocuments.net/reader035/viewer/2022081514/5697bfef1a28abf838cba204/html5/thumbnails/24.jpg)
January 2004 ELEC 121 24
JFET Self Bias with Dual Supply
![Page 25: JFET Biasing ELEC 121. January 2004ELEC 1212 JFET Fixed Bias R G is present to limit current in case V GG is connected with wrong polarity This would.](https://reader035.fdocuments.net/reader035/viewer/2022081514/5697bfef1a28abf838cba204/html5/thumbnails/25.jpg)
January 2004 ELEC 121 25
Determination of Q-point for Self Bias with Dual Supply
![Page 26: JFET Biasing ELEC 121. January 2004ELEC 1212 JFET Fixed Bias R G is present to limit current in case V GG is connected with wrong polarity This would.](https://reader035.fdocuments.net/reader035/viewer/2022081514/5697bfef1a28abf838cba204/html5/thumbnails/26.jpg)
January 2004 ELEC 121 26
Common Gate JFET Self Bias
![Page 27: JFET Biasing ELEC 121. January 2004ELEC 1212 JFET Fixed Bias R G is present to limit current in case V GG is connected with wrong polarity This would.](https://reader035.fdocuments.net/reader035/viewer/2022081514/5697bfef1a28abf838cba204/html5/thumbnails/27.jpg)
January 2004 ELEC 121 27
Common Gate JFET Self Bias DC Bias Circuit
![Page 28: JFET Biasing ELEC 121. January 2004ELEC 1212 JFET Fixed Bias R G is present to limit current in case V GG is connected with wrong polarity This would.](https://reader035.fdocuments.net/reader035/viewer/2022081514/5697bfef1a28abf838cba204/html5/thumbnails/28.jpg)
January 2004 ELEC 121 28
Common Gate JFET Self Bias