Circuits & Schematics - Oscillators - 7

The circuit in Figure 1 is a variation on the familiar integrator/comparator triangle-wave oscillator, which you typically implement with two op amps. An integrator and a comparator connect in a positive-feedback loop; the comparator drives the ...

Nonlinear systems often need to become linear to be useful, and the circuit in Figure 1 provides a nonlinear sawtooth pulse for a PWM (pulse-width modulator) that can compensate for nonlinearities in sensors, controllers, or systems. The circuit ...

A current-feedback amplifier is a well-known component with many uses. Its basic block diagram shows that its input stage is a voltage follower in practice, a symmetrical emitter follower (Figure 1). The configuration samples the output current, ...

Experimenting with an HF oscillator, I needed to control the varactor diode voltage in precise increments over a 2 V-10 V range. A buffered potentiometer was the obvious choice, and connecting two pots in series to give coarse/fine control (or ...

Sine-wave RC-oscillators with smooth frequency tuning described in the article radically and favorably differ from previously known generators of this purpose by the presence of only one frequency-setting capacitor. Sine-wave RC-oscillators have ...

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 ...