- Signal Generator Definition: A signal generator is defined as a device that produces electronic signals and waveforms for testing and designing electronic equipment.
- Function Generators: Function generators create basic waveforms like sine and square waves using electronic oscillators.
- Arbitrary Waveform Generators: These generators produce complex, user-defined waveforms for specialized testing.
- RF Signal Generators: RF signal generators generate radio frequencies using phase-locked loops for stable signal output.
- Block Diagram of Signal Generator: The block diagram of a signal generator illustrates the components and flow of signals within the device, showing how it produces and modulates different waveforms.
What is a Signal Generator?
Signal generators are electronic devices that produce electronic signals and waveforms. These signals can be repeating or non-repeating, depending on the application. Different types of signal generators have varying capabilities and functions. They come in different designs, sizes, and parameters to serve a wide range of purposes. Signal generators are essential in designing, repairing, and troubleshooting electronic devices. Versatile signal generators can create many signals to meet various debugging challenges. The output of a signal generator can be adjusted by setting the amplitude and frequency during a simulation.
Types of Signal Generators
Functional Signal Generators
A function generator uses an electronic oscillator to produce simple repetitive waveforms like sine, square, triangle, and sawtooth waves. In modern devices, these waveforms are created using digital signal processing, which is then converted to analog signals at lower frequencies.
A variety of function generators are black boxes with USB interfaces, used in instrumentation bus, and some are in the form of software. Their common uses are in the field of education, repairing electrical and electronic equipment and stimulus testing.
Arbitrary Waveform Generators
Arbitrary waveform generators produce random streams of digital information in various waveforms. They have two independent output channels to stimulate two systems at once. These generators are often used to test systems with complex waveforms. They include a display screen to accurately show the waveforms, reducing errors when selecting from memory. While they have limited bandwidth and are more expensive than function generators, they are used in semiconductor, communication, and system tests.
RF Signal Generators
Radio frequency (RF) signal generators use methods like phase-locked loops and direct digital synthesis to produce signals. Most rely on frequency-locked loops for stability and accuracy. They produce continuous wave tones within a specific frequency range. RF and microwave generators are similar, but microwaves cover a wider frequency range. RF generators are used for testing systems, broadcasting, satellite communications, radar, and electronic warfare. They are categorized into three main types.
Analog Signal Generators
It is based on sine wave oscillator with a sharp distinction in design of radio frequency and audio frequency signal generators. But now it is outdated and digital electronics are in use.
Vector Signal Generators
Vector signal generators also called digital signal generators are capable of generating digitally modulated radio signals with complex modulation formats such as QPSK< QAM, etc.
Logical Signal Generators
Logical signal generators produce logic pulses in the form of conventional voltage levels. These generators are often called digital pattern generators. Pulse generators are able to generate pulses with variable delays and some even offer variable rise and fall times. It is used for functional validation and testing.
Audio Signal Generators
Audio signal generators generate signals in the range of audible i.e. typically in the range of 20 Hz to 20 KHz. It is used in checking frequency response in an audio system and the distortion measurements. Even a very low distortion could be measured with a relatively simple circuit by an audio signal generator. They have very low levels of harmonic distortion. These generators have a wide variety of application in electronic laboratories. Those generators which use intricate methods to generate audio signals for music are termed as the synthesizer.
Video Signal Generators
A video signal generator produces video waveforms and other signals to test for faults. Synchronization is crucial for video quality on television, so these generators typically include vertical and horizontal sync signals. Video signal generators have various applications and support multiple digital formats.
