Function Generator

- key points and tips about the basics of what is a function generator, what one can do, the way one can be used, and the specifications for a function generator and the basics of a function generator circuit.

Function generators are items of test equipment that are able to generate a variety of simple repetitive waveforms. Straightforward signal generators such as RF signal generators or simple audio oscillators focus on producing a good sine waves, but in many cases other waveforms are needed.

In addition to producing sine waves, function generators may typically produce other repetitive waveforms including sawtooth and triangular waveforms, square waves, and pulses. Another feature included on many function generators is the ability to add a DC offset.

Often some of the low end function generators may only operate up to frequencies of possibly around 100 kHz as the various shaped waveforms are normally only needed at lower frequencies. However many other more comprehensive function generators are able to operate at much higher frequencies, often up to 10 or 20 MHz.

Types of function generator

There are a number of ways of designing function generator circuits. However there are two main approaches that may be used:

• Analogue function generator circuit
• Digital function generator circuit

Today, most function generators adopt a digital approach, analogue function generators will still be encountered as they are still able to provide levels of performance that are more than satisfactory for the exacting requirements needed in many development laboratories.