Early Contributions At Bell Labs and Ph.D.
Fresh from graduate school he was promptly hired by Bell Labs in New York City, where he began his career as designer of electronic filters and equalizers. Subsequently, in 1929, he was assigned to the Mathematical Research Group, where he excelled in research related to electronic networks theory and its application to telecommunications. Sponsored by Bell Laboratories he reentered graduate school, this time at Columbia University, and he successfully completed his Ph.D. in physics in 1935.
In 1938, he developed his asymptotic phase and magnitude plots. His work on Automatic (Feedback) Control Systems introduced innovative methods to the study of system stability that enabled engineers to investigate time domain stability using the frequency domain concepts of gain and phase margin, the study of which was aided by his now famous plots. In essence, his method made stability transparent to both the time and frequency domains and, furthermore, his frequency domain-based analysis was much faster and simpler than the traditional time-domain-based method. This provided engineers with a fast and intuitive stability analysis and system design tool that is as popular today as it was groundbreaking then. He, along with Harry Nyquist, also developed the theoretical conditions applicable to the stability of amplifier circuits.
Read more about this topic: Hendrik Wade Bode
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