ElectronicsI_L29 - Lecture 29 Joel Therrien, U....

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© Joel Therrien, U. Massachusetts Lowell, 2007 1 Lecture 29
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© Joel Therrien, U. Massachusetts Lowell, 2007 2 Frequency Response • So far we have only considered a very simplified AC analysis. • Note that we rely on coupling capacitors to keep the DC biasing for the amplifiers separate from our signals. • But these capacitors can not be infinite in reality, so there is going to be a frequency response. • When one looks at circuits, it is apparent there will be a high pass filter effect. • Thus we should expect a reduced response at very low frequencies.
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Massachusetts Lowell, 2007 3 Rock and a Hard Place • On the high frequency end, there will also be a reduced response (we call it a roll off) • Why? Where are the capacitors that do this? – They are inside the transistors – And the wires even • Everything has a parasitic capacitance. This connects the signal line to ground.
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This note was uploaded on 02/13/2012 for the course PHYSICS 16.365 taught by Professor Staff during the Summer '10 term at UMass Lowell.

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ElectronicsI_L29 - Lecture 29 Joel Therrien, U....

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