In adjustable, frequency-selective RC networks, the reciprocal of an RC product, ωC = 1/RC, determines the corner frequencies of the network. If the adjustable elements are potentiometers with a linear-control characteristic that is, taper ...
The circuits of PWM pulse generators with independent frequency and duty cycle adjustments are described. The first one uses the TLC555 IC and an external master pulse generator on the CD40106 IC. The second oscillator is made on the D-trigger of ...
Some applications require clock-timing adjustments, such as generating precision clocks for time-interleaved ADCs, or delay adjustments in a variety of precision-timing and pulse-delay applications. This Design Idea describes a delayed-pulse ...
Sawtooth- or exponential-ramp relaxation oscillators are common and generally easy to build. However sometimes a cleaner waveform is desired, and generators of even-symmetric waveforms are a bit more difficult to design. Triangle wave generators ...
The circuit in Figure 1 is based on a classic GIC (generalized impedance converter). The sine-wave-oscillator circuit has inherent amplitude stabilization and normally operates from dual power supplies. However, if you connect an additional ...
For a variety of reasons, designers often discover that their creations need yet more power-supply voltages. For example, a system powered by 2.5 V power supplies suddenly needs a precision 1.4 V reference for a signal-level-shifting circuit and ...
A random-bit-sequence generator is basic equipment for prototyping and testing any data-transmission system. You use such a generator when measuring BER (bit-error rate) and pattern-dependent effects in a transmission system. Such effects can ...
A broadband source of white noise can be useful for measuring and testing communications equipment. The source in Figure 1 is simple and produces a large noise signal at its output terminals. The circuit comprises a zener diode and a few amplifying ...
The circuit here is an oscillator with an unusual frequency divider that I designed when I was developing an RF system. I needed a stable and accurate 455 kHz digital signal generator that used as few components as possible. The signal generator ...
Digital potentiometers are versatile devices; you can use them in many filtering and waveform-generation applications. This Design Idea describes an oscillator in which setting the resistance of two digital potentiometers independently programs the ...