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D-COAX, INC. • P.O. Box 999
Newberg, Oregon 97132  USA
Ph: 503-922-2436 • Fax: 503-376-8237

Equipping engineers with solutions and products for their success.

Frequency Response and Rise Time

A Fourier analysis of a square wave waveform will show that the composition is made of the odd harmonic of the fundamental frequency of sine waves. A (sin x)/x relationship shows that when the rise time is shorter, higher bandwidth is needed. Typical margins for error when measuring time domain parameters are for the system Tr to be 1/3 the expected device Tr for ~ 5% error.      1/7 the expected Tr for ~ 1% error.

Tr = (0.35)/bandwidth     and      Bw = (0.35)/Tr

chart - frequency response & rise timeBack to tutorials page