September 26, 2013
Hosted by: Columbia Integrated System Laboratory
Speaker: Nagendra Krishnapura, Associate Professor, IIT Madras
The nonlinearity of an element can be altered while retaining the original operating point and first-order terms by appropriately combining multiple instances of the nonlinear element with appropriate scaling factors for incremental voltages above the operating points. Per-element distortion contributions in a circuit can then be determined by altering the nonlinear terms by known factors and simulating the output distortion in each case. This technique can be used in a standard circuit simulator with the appropriate nonlinear device models but requires no knowledge of the device model details on the part of the circuit designer. The technique is demonstrated by applying it to a common source amplifier with a nonlinear load and a two stage fully differential opamp.
Nagendra Krishnapura obtained his BTech from the Indian Institute of Technology, Madras, India and his PhD from Columbia University, New York. He has worked as an analog design engineer at Texas Instruments, Bell Laboratories, Celight Inc., Multilink, and Vitesse semiconductor. He has taught analog circuit design courses at Columbia University as an adjunct faculty. He is currently an associate professor at the Indian Institute of Technology, Madras. His interests are analog and RF circuit design and analog signal processing.