Waveform & Function Generators

The primary difference lies in flexibility and signal complexity. A function generator is designed to produce a standard set of periodic waveforms, such as sine, square, and triangle waves. It is ideal for general-purpose testing and basic circuit validation.

In contrast, an arbitrary waveform generator (AWG) allows users to generate custom, user-defined signals point-by-point. While a function generator is limited to its built-in library, an AWG can replicate complex real-world signals, including noise, glitches, or modulated data streams. High-performance models like the Keysight 33622A offer the best of both worlds, providing standard functions alongside sophisticated arbitrary waveform capabilities for advanced R&D and troubleshooting applications.

An arbitrary waveform generator (AWG) is a sophisticated piece of electronic test equipment used to generate highly specific electrical waveforms. Unlike standard oscillators, an AWG utilizes digital-to-analog converters (DACs) to translate a series of stored digital values into a precise analog voltage signal.

This architecture enables the engineer to define the exact shape of the wave, including its amplitude, frequency, and timing characteristics. AWGs are indispensable in fields like telecommunications, aerospace, and semiconductor testing, where standard signals are insufficient. Instruments such as the Keysight 33521B provide the high resolution and deep memory necessary to store and play back complex, non-repeating signal patterns with extreme fidelity.

An arbitrary waveform generator performs precise signal generation by “replaying” a digital representation of a waveform from memory. Its core function is to emulate real-world environments by injecting custom signals into a device under test (DUT).

Engineers use AWGs to simulate rare circuit anomalies, replicate sensor outputs, or generate complex modulated signals for wireless testing. By creating specific “scripts” for voltage changes over time, an AWG can test the limits of a system’s tolerance. Whether you are using a Keysight 33611A to stress-test a receiver or simulating a biological pulse for medical device validation, the AWG provides the precise control needed to ensure performance under unique conditions.

A function generator is a fundamental tool in any electronics lab, used to provide a reliable source of repetitive electrical signals. It typically generates basic periodic waveforms, most commonly sine, square, triangle, and ramp shapes. These signals are used as a stimulus for electronic circuits to analyze their frequency response or signal-processing capabilities.

Modern function generators, often categorized as Arbitrary Function Generators (AFG), such as the Tektronix AFG3021C, use Direct Digital Synthesis (DDS) technology. This ensures high frequency stability and low distortion. They are the “workhorses” of the bench, providing the essential signals required for standard gain measurements, filter characterization, and clock signal simulation in digital circuits.

A function generator provides the “input” signal required to test, characterize, and troubleshoot electronic components and systems. By injecting a known waveform—such as a 1kHz sine wave—into an amplifier or filter, a technician can measure the output to determine if the device is functioning correctly.

It allows for the adjustment of key parameters, including frequency, amplitude, DC offset, and duty cycle. Beyond simple wave shapes, many function generators also provide modulation (AM, FM, PWM) and sweep capabilities. Portable and reliable units like the Tektronix AFG3102C are used daily by engineers to verify circuit logic, calibrate other test equipment, and perform routine maintenance on industrial electronic systems.