In this exercise, the same question should be assumed as in exercise 3.3.1. This time, however, the influence of the impedance converter on the sensor signal is to be analyzed. The signal curve of the ECG voltage must be simulated by the voltage source. To do this, select Piecewise linear
(3rd from the right) as the voltage source and use the curve below.
In addition, the influence on the current (= output resistor of the sensor) must be taken into account. To do this, insert a resistor with $20 ~\rm M\Omega$ directly in front of the non-inverting inputs.
Circuit
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» Model Parameters
). The analysis of the entire circuit (including the equivalent circuit diagram) is not to be considered here. It is assumed that the „input bias current“ of the operational amplifier is the decisive value.