Lecture 28_v2 - Lecture 28 Beginning amplifiers+op-amps...

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Spring 2011 ECE 2100, Cornell University, Prof. Molnar 1 Lecture 28 Beginning amplifiers+op-amps
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Spring 2011 ECE 2100, Cornell University, Prof. Molnar 2 Amplifiers Use amplifiers to make signals bigger Ideally, treat this as a voltage- controlled voltage source with gain Av. A sense for how this might be done: – Start with a voltage controlled conductance: this is a good model of: • Some transistors • Synapses – Load with big resistor+ battery Key points: – Battery voltage+ DC current needed – Output limited to 0<Vout<Vbat – Always have an output impedance – Also, typically have a finite input impedance + - Av(V in + - V in - ) + - V in + V in - Vout + - V in + V in - + - RL Vout Vin ( 29 2 1 1 1 1 1 in L bat kV R if in L bat L in out in L bat L bat out in kV R V kV R kV R dV dV Av kV R V gR V V kV g in L + - = + = + = = g=kV in V bat
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Spring 2011 ECE 2100, Cornell University, Prof. Molnar 3 Amplifier model • Three parameters: voltage gain, Av; input
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This note was uploaded on 06/10/2011 for the course ECE 2100 taught by Professor Kelley/seyler during the Spring '05 term at Cornell University (Engineering School).

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Lecture 28_v2 - Lecture 28 Beginning amplifiers+op-amps...

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