Convert periodic waveforms to square waves:
08/16/2001 EDN - Design Ideas / Converting periodic
waveforms to square waves is an integral part of
extracting a clock signal from data, creating
waveform generators, and making timing-pulse
generators. Any square-wave-conversion circuit is
more valuable when the square wave's duty cycle is
variable and controllable. Figure 1 shows a circuit
that has these attributes and can drive several TTL-compatible
loads..
Square wave modulator has variable frequency and
pulse width: 08/08/2002 EDN - Design Ideas / A
few years ago, I worked at a disk-drive company. We
had a plating facility that required square waves to
drive the high-voltage plating operation. The
challenge was that the square wave's pulse width had
to be variable, along with the duty cycle. Also, the
amplitude of the pulses had to be adjustable..
Tiny Programmable Oscillator With 5Khz to 20 MHz
Span: Not only does this circuit take up very
little board space but it can be controlled with
only3-signals from a microprocessor. The MAX5160 is
a200K digital pot with32 taps. To move up to the
next tap, set UP/DOWN high and pulse INCREMENT low.
To move down, set UP/DOWN low before pulsing
INCREMENT. The LTC1799 is a programmable oscillator
from Linear Technology.
