| From the introduction—Sinusoidal functions have not always
held a preeminent position in the synthesis and analysis of electromagnetic
systems. Historically, the first radiation of electromagnetic energy was
accomplished with pulses, not sinusoids. The development of the practical
capacitor, the relatively high cost of active switching elements, and the
resulting emphasis onlinear, time-invariant system theory have been the
chief reasons for the present preponderant use of sines and cosines. Semiconductor
technology has changed the economics of system design and implementation.
Today an active switch costs less than a capacitor and uses less space.
Often it is less expensive to use several transistors than one resistor
when a medium- or large-scale integrated circuit is designed…
12 pages. |