Lecture7a

# Lecture7a - Lecture 7 TRANSISTOR CIRCUITS Topics Load Line...

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Lecture 7. TRANSISTOR CIRCUITS Objectives: Topics: Find the transfer characteristic using a load line Obtain the transconductance curve Find transistor voltages and currents analytically and graphically Load Line The Transfer Characteristic Transconductance Examples

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MOSFET Circuits i D , mA v DS , V 0 10 51 0 v GS =3V 4V 5V 6V V 1 =3V, 5V. v DS , i D -? V DD and R D could be viewed as a Thevenin equivalent Many intersection points. Which on is the answer? a) V 1 =v GS =3V b) V 1 =v GS =5V
i D , mA v DS , V 0 10 51 0 v GS =3V 4V 5V 6V a b Solve the same problem analytically a) V 1 =v GS =3V - C.C.R. - use equations for i D We need to know V TR and K 1) V TR = 2) Pick any point in C.C.R. (for example point c) Solve for K v DS >(v GS -V TR ) Verify that it is C.C.R.

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b) V 1 =v GS =5V - Triode ] ) ( 2 [ 2 DS DS TR GS D v v V v K i = D D DD DS i R V v = Which one is right? What if we did not know the region of operation? - start assuming the C.C.R. (simpler equations) Part b) of the above example: 2 ) ( TR GS D V v K i = Verify that it is C.C.R.
The Transfer Characteristic (MOSFET) i D , mA v DS , V 0 10 51 0 v GS =3V 4V 5V 6V 7V 5 v IN , V 0 10

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Lecture7a - Lecture 7 TRANSISTOR CIRCUITS Topics Load Line...

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