is a device that produces repetitive waveforms at the desired frequency.
It can therefore generate sine, square, triangle, sawtooth, and other
output waveforms. There are now many off-shelf waveform generator IC's
that can be conveniently used and incorporated into a circuit that
requires an auto-generated periodic waveform. Some examples of these
waveform generator IC's are presented below, with brief descriptions
provided by their respective manufacturers in their websites.
ICL8038 waveform generator
(manufactured by Intersil) is a monolithic integrated circuit
capable of producing high accuracy sine, square, triangular, sawtooth
and pulse waveforms with a minimum of external components. The frequency
(or repetition rate) can be selected externally from 0.001Hz to more
than 300kHz using either resistors or capacitors, and frequency
modulation and sweeping can be accomplished with an external voltage.
The ICL8038 is fabricated with advanced monolithic technology, using Schottky
barrier diodes and thin film resistors, and the output is stable over a
wide range of temperature and supply variations. These devices may be
interfaced with phase locked loop circuitry to reduce temperature drift
to less than 250ppm/C. Key features
include: Low Frequency Drift with Temperature 250ppm/C; Low Distortion 1% (SineWave Output); High Linearity 0.1% (Triangle Wave Output); Wide Frequency Range 0.001Hz to 300kHz; Variable Duty Cycle 2% to 98%; High Level Outputs TTL
to 28V; Simultaneous Sine, Square, and Triangle Wave Outputs
by Maxim) is a precision, high-frequency function generator that
produces accurate sine, square, triangle, sawtooth, and pulse waveforms
with a minimum of external components. The internal 2.5V reference (plus
an external capacitor and potentiometer) lets the signal
frequency be varied from 0.1Hz to 20MHz. An applied ±2.3V control signal varies
the duty cycle between 10% and 90%, enabling the generation of sawtooth
waveforms and pulse-width modulation.
A second frequency-control input, used primarily as a VCO input in
phase-locked-loop applications, provides ±70% of fine control. This
capability also enables the generation of frequency sweeps and frequency
modulation. The frequency and duty-cycle controls have minimal
interaction with each other. All output amplitudes are 2Vp-p, symmetrical about ground. The
low-impedance output terminal delivers as much as ±20mA, and a two-bit
code applied to the TTL-compatible A0 and A1 inputs selects the sine,
square, or triangle output waveform.
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(manufactured by Exar) is a precision waveform generator IC capable of
producing sine, square, triangular, sawtooth, and pulse waveforms, with
a minimum number of external components and adjustments. The XR8038A
allows the elimination of the external distortion adjusting resistor
which greatly improves the temperature drift of distortion, as well as
lowering external parts count. Its operating frequency can be selected
over eight decades of frequency, from 0.001Hz to 200kHz, by the choice
of external R-C components.
of oscillation is highly stable over a wide range of temperature and
supply voltage changes. Both full frequency sweeping as well as smaller
frequency variations (FM) can be accomplished with an external control
voltage. Each of the three basic waveform outputs, (i.e., sine, triangle
and square) are simultaneously available from independent output
terminals. The XR8038A monolithic waveform generator uses advanced
processing technology and Schottky barrier diodes to enhance its
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