Lect.26: BJT amplifiers(1)
Lect.26: BJT amplifiers(1)
Lect.26: BJT amplifiers(1)
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Lect. 26: <strong>BJT</strong> <strong>amplifiers</strong>Frequency response of <strong>BJT</strong> cascodefτH1≅2πτH= C R + C R + C R + ( C + C )( R || R )H π1 π 1 µ 1 µ 1 π 2 c1 L µ 2 L outwhere R = R || rπ1 sig π1R = ( R || r )(1 + g R ) + Rµ 1 sig π1 m1 c1 c1⎡⎢R = r || ⎢r⎢⎢⎣c1 o1 e2⎤ro2+ R ⎥L⎥RLro2+ ⎥β2+ 1 ⎥⎦Using parameters given in Exercise 6.20 and 6.28,CE has f H= 75kHz, Cascode has f H=469KHz.Electronic Circuits 1High-Speed Circuits and Systems Laboratory
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