Transcription of Lecture 19 - MIT
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Lecture 19 - MIT
Spring 2007 Lecture 191 Lecture 19 Transistor Amplifiers (I)Common-Source AmplifierOutline Amplifier fundamentals Common-source amplifier Common-source amplifier with current-source supplyReading Assignment:Howe and Sodini; Chapter 8, Sections :Quiz #2:April 25, 7:30-9:30 PM at Walker. Calculator Required. Open book. Spring 2007 Lecture 192 Amplifier Fundamentals Source resistance RSis associated onlywith small signal sources Choose ID= ISUP---> DC output current IOUT= 0 VOUT= 0+ + vsisRSvIN = VBIAS + vs iIN = IBIAS + is VBIASIBIASRSV oltage InputCurrent InputSupplyCurrent ISUPI nputsourcesIntrinsicAmplifierActive DeviceiD = f(input) ISUPRLiOUT = idiD+ V V+ Spring 2007 Lecture 1932. Common-Source Amplifier: VBIAS, RDand W/L of MOSFET selected to bias transistor in saturation and obtain desired output bias point ( VOUT= 0).
Voltage divider at input: Voltage divider at output: Loaded voltage gain: v in=R vs Rin +Rs vout =RL Avovin Rout +RL vout vs = Rin Rin +RS Avo RL RL +Rout +-vin +-Avovin vout Rout +-Rin Rs vs +-RL unloaded circuit output loading input loading. 6.012 Spring 2007 Lecture 19 8 Small-signal voltage gain Avo: draw small-signal
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