Ī typical function generator can provide frequencies up to 20 MHz. Used in dual-tone multi-frequency signaling and early modem tones. Two such walking ring counters are perhaps the simplest way to generate the continuous-phase frequency-shift keying This is perhaps the simplest numerically-controlled oscillator. Most function generators also contain a non-linear diode shaping circuit that can convert the triangle wave into a reasonably accurate sine wave by rounding off the corners of the triangle wave in a process similar to clipping in audio systems.Ī walking ring counter, also called a Johnson counter, and a (linear) resistor-only shaping circuit is an alternative way to produce an approximation of a sine wave. Other duty cycles (theoretically from 0% to 100%) can be obtained by using a comparator and the sawtooth or triangle signal. slow rise and fast fall, or fast rise and slow fall.Ī 50% duty cycle square wave is easily obtained by noting whether the capacitor is being charged or discharged, which is reflected in the current switching comparator output. Sawtooth waves can be produced by charging the capacitor slowly with low current, but using a diode over the current source to discharge quickly - the polarity of the diode changes the polarity of the resulting sawtooth, i.e. By varying the current and the size of the capacitor, different frequencies may be obtained. As the output voltage reaches upper or lower limits, the charging or discharging is reversed using a comparator, producing the linear triangle wave. This produces a linearly ascending and descending voltage ramp. The triangular wave is generated by repeatedly charging and discharging a capacitor from a constant current source. This triangular wave is used as the basis for all of its other outputs. Simple function generators usually generate triangular waveform whose frequency can be controlled smoothly as well as in steps. Function generators are primarily used for working with analog circuits, related pulse generators are primarily used for working with digital circuits.Įlectronic instruments Principles of Operation For example, they may be used as a signal source to test amplifiers or to introduce an error signal into a control loop. įunction generators are used in the development, test and repair of electronic equipment. Some function generators can be phase-locked to an external signal source (which may be a frequency reference) or another function generator. When those traits are required, other signal generators would be more appropriate. Integrated circuits used to generate waveforms may also be described as function generator ICs.Īlthough function generators cover both audio and radio frequencies, they are usually not suitable for applications that need low distortion or stable frequency signals. Another feature included on many function generators is the ability to add a DC offset. These waveforms can be either repetitive or single-shot (which requires an internal or external trigger source). Some of the most common waveforms produced by the function generator are the sine wave, square wave, triangular wave and sawtooth shapes. In electrical engineering, a function generator is usually a piece of electronic test equipment or software used to generate different types of electrical waveforms over a wide range of frequencies. It can be used to test a design or confirm that a piece of electronic equipment is working as intended.Sine, square, triangle, and sawtooth waveforms In this regard, what is the function of function generator?Ī function generator is a piece of electronic test instrument used to generate and deliver standard waveforms, typically sine and square waves, to a device under test. Also asked, what is function generator and types?Ī function generator is usually a piece of electronic test equipment or software used to generate different types of electrical waveforms over a wide range of frequencies. Used for testing DC power supply.For testing the delay margin.Analyze the audio DAC.To test clock frequency functional range of digital circuits. Just so, what are the applications of function generator?Īpplications of Function Generator. This programmable signal generator has a maximum frequency range of 60 MHz and it can give the output waveforms of sine, square, triangle, pulse and arbitrary waves. Goupchn Programmable DDS Signal Generator Of all the products, signal generators are high-rated and have the best customer reviews.
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