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Lecture 28_v2

# 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
Spring 2011 ECE 2100, Cornell University, Prof. Molnar 3 Amplifier model Three parameters: voltage gain, Av; input impedance, Zin and output impedance Zout.

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

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