# fet amp - FET Ampliers 20v 20v 6.6k 6.6k vgs VGS = 5v VDS...

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Lecture 21-1 FET Ampliﬁers 20v 6.6k v gs V GS = 5v I DS (mA) V GS =4.0V V GS =3.0V V GS =2.0V V GS =1.0V V GS =5.0V V DS 0 10 20 0 1 2 3 V T0 =1.0V K p =2e-5 [A/V 2 ] W=100 microns L=10 microns 20v 6.6k V GS = 5v V DS +v ds + - V DS + -

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Lecture 21-2 FET Ampliﬁers 20v R D =6.6k v gs V GS = 5v I DS (mA) V GS =4.8V V GS =5.0V V DS 01 0 20 0 1 2 3 V GS =5.2V A 200mv peak ac input voltage will cause more than a 1v peak ac output voltage What would we change to make the voltage gain even larger? v V DD R D i D = ~2V
Lecture 21-3 dc Solution of FET Ampliﬁer Set the ac source to zero and analyze the dc bias point Solution should agree with that from load line approximation IDS1 1.919 mA + 20V VDD - + 5V VGS1 L=10E-6 W=100E-6 +- VD 7.335 V RC 6.6k

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Lecture 21-4 dc Solution of FET Ampliﬁer Response for a 5kHz, 0.2v peak ac input signal time 0 2 4 6 8 10 e-4s 4 5 6 7 8 9 V out V in
Lecture 21-5 dc Solution of FET Ampliﬁer The output signal is somewhat distorted for a 0.4v peak ac input time 0 2 4 6 8 10 e-4s 4 5 6 7 8 9 10 V out V in

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Lecture 21-6
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fet amp - FET Ampliers 20v 20v 6.6k 6.6k vgs VGS = 5v VDS...

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