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DESIGN AND DEVELOPMENT OF MEDICAL ELECTRONIC ...

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1.61.41.2Output Voltage10.80.60.4DVM Reading (V)0.200 500 1000 1500 2000 2500Decade Box Setting (Ω)Figure 8.28 The intracardiac impedance sensor produces an output voltage that follows this graph as a function of impedance (resistive).+VsrcS1OUTS3CouplingCDIFFS5Ca1S6LEADCa2S4HEARTS/HS2-VsrcFigure 8.29 Implementations of the same concept can be done in integrated circuits without the need for operational amplifiers throughthe use of a switched-capacitor differential to single-ended converter, which also acts as a sample-and-hold circuit.409

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