Bioinstrumentation

This short book provides basic information about bioinstrumentation and electric circuit theory. Many biomedical instruments use a transducer or sensor to convert a signal created by the body into an electric signal. Our goal here is to develop expertise in electric circuit theory applied to bioinstrumentation. We begin with a description of variables used in circuit theory, charge, current, voltage, power and energy. Next, Kirchhoff's current and voltage laws are introduced, followed by resistance, simplifications of resistive circuits and voltage and current calculations. Circuit analysis techniques are then presented, followed by inductance and capacitance, and solutions of circuits using the differential equation method. Finally, the operational amplifier and time varying signals are introduced. This lecture is written for a student or researcher or engineer who has completed the first two years of an engineering program (i.e., 3 semesters of calculus and differential equations). Aconsiderable effort has been made to develop the theory in a logical manner-developing special mathematical skills as needed. At the end of the short book is a wide selection of problems, ranging from simple to complex.

Introduction.- Basic Bioinstrumentation System.- Charge, Current, Voltage, Power and Energy.- Resistance.- Linear Network Analysis.- Thevenin's and Norton's Theorems.- Inductors.- Capacitors.- Inductance and Capacitance Combinations.- General Approach to Solving Circuits Involving Resistors, Capacitors and Inductors.- Operational Amplifiers.- Time-Varying Signals.- Active Analog Filters.- Bioinstrumentation Design.- Exercises.