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lecture03

# lecture03 - BIEN 130 Bioinstrumentation L03 April 7 2009...

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BIEN 130: Bioinstrumentation L03 April 7, 2009 Hyle Park

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Questions?
Op-amp Problem is that the open loop gain is normally really large To get reasonable output voltages, V + and V - are usually nearly equal The input internal resistance is also very large, so input currents are also nearly zero. The output resistance is almost zero. high supply low supply ground non-inverting input inverting input output V + V - out V ( 29 out openloop V V V G + - = -

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Non-inverting amplifier in V 1 R 2 R out V 1 1 2 out R V V R R - = + in V V + = ( 29 1 1 2 out openloop in out openloop V V V G R V V G R R + - = - = - + 1 1 2 1 out openloop in openloop R V G V G R R + = + 1 1 2 1 openloop out in openloop G V R V G R R = + + 1 1 2 openloop openloop G R G R R = + 1 2 1 out in V R R V R + =
Inverting amplifier Why isn’t this a voltage divider? Position of ground relative to V in and V out in V 1 R 2 R out V 0 V + = 0 V -

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Inverting amplifier in V 1 R 2 R out V 0 V + = 0 V - f I in I 0 f in I I I - + = f in I I = - 2 2 out f f V I R
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