What is the common mode input impedance of preamplifier used in square wave blood flowmeter?(a) 110 MW(b) 130 MW(c) 150 MW(d) 180 MWI have been asked this question by my college director while I was bunking the class.Origin of the question is Cyber Medicine topic in chapter Telemedicine Technology of Biomedical Instrumentation

What is the common mode input impedance of preamplifier used in square

1.	What is the common mode input impedance of preamplifier used in square wave blood flowmeter?(a) 110 MW(b) 130 MW(c) 150 MW(d) 180 MWI have been asked this question by my college director while I was bunking the class.Origin of the question is Cyber Medicine topic in chapter Telemedicine Technology of Biomedical Instrumentation
Answer» The correct answer is (c) 150 MW For EXPLANATION I would say: The preamplifier USED by Goodman (1969(a)) has a CMRR of 106 dB (200,000 : 1) with a common mode INPUT IMPEDANCE of 150 MW. The preamplifier gain is of the order of 1000. The preamplifier also must incorporate the FACILITY for ‘probe balance’ by which signals in phase with the magnet current can be selected to balance background voltages in phase with flow voltages. A calibrating signal of 30 mV amplitude can be connected to the preamplifier with an input selector switch.

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