lecture04 - BIEN 130 Bioinstrumentation L04 April 9 2009...

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BIEN 130: Bioinstrumentation L04 April 9, 2009 Hyle Park
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Questions? Go over answers to quiz
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Differential amplifier Common/differential mode voltage and gain Common mode rejection ratio , in V - 1 R 2 R out V , in V + 2 R 1 R ( 29 2 , , 1 out in in R V V V R + - = -
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Instrumentation amplifier 1 R 3 R out V 4 R , in V - , in V + 1 R 2 R ( 29 1 4 , , 2 3 2 1 out in in R R V V V R R = - + - ÷ 3 R 4 R
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Questions?
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Biopotential With a lot of bioinstruments, a sensor is needed to convert the measurand to an electrical quantity. Example: a digital scale uses a strain gage to convert weight into a change in resistance There are a lot of bioinstruments that directly measure electrical changes directly. Electrical changes that occur biologically are known as biopotentials. What types of cells cause biopotentials?
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Biopotential
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Nerve cell
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Action potential
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Upon stimulation of the nerve, an action potential propagates along the axon. Can be characterized by a changing voltage
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This note was uploaded on 02/17/2010 for the course BIEN 130 taught by Professor Park during the Spring '10 term at UC Riverside.

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lecture04 - BIEN 130 Bioinstrumentation L04 April 9 2009...

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