
Signal sources 219
various output voltages, including 5.0 V, 10.0 V
and 10.24 V.
Non-sinusoidal waveform generators
Sources of AC signals can be divided into two main
categories: sine wave generators, and generators
of non-sinusoidal waveforms. The latter can be
subdivided again into pulse generators and other
types.
Pulse generators provide pulses of positive-
or negative-going polarity with respect to earth or
to a presettable DC offset voltage. The pulse
repetition frequency, pulse width, amplitude and
polarity are all adjustable; on some pulse genera-
tors,
so too are the rise and fall times. Commonly
also the output may be set to provid