Bandwidth (per waveform)

The “MHz” rating is the max sine frequency. Square, pulse and arbitrary waveforms are usually limited much lower. Check the spec table for the waveform you actually use.

Channels & Phase

Two channels let you create phase-shifted, I/Q or quadrature signals and simulate encoders. Independent dual outputs are standard now — single-channel units cost less.

Sample Rate & Resolution

Higher sample rate (MSa/s–GSa/s) and 14–16-bit vertical resolution mean cleaner, lower-distortion arbitrary waveforms and finer amplitude steps.

Modulation & Sweep

AM/FM/PM/FSK, sweep and burst turn a basic generator into a real test tool for RF, comms and frequency-response work. Almost every pick here covers the basics.

Remote Control (SCPI)

USB/LAN with SCPI and LabVIEW support lets you automate tests and build a Bode plotter with a matching scope. A must for repeatable, scripted measurements.

The OWON DGE2070 is the sweet spot for makers who want maximum capability per dollar: two channels, the highest sine bandwidth in this guide at 70MHz, 300 MSa/s, 14-bit resolution and 8K arbitrary memory — plus full SCPI and LabVIEW remote control for automated testing. At around $169 it undercuts every benchtop here while keeping the features that matter for sweep, burst and frequency-response work.

If you mostly need one clean, accurate output — for radio alignment, HF signal injection or oscilloscope calibration — the single-channel OWON DGE1060 delivers 60MHz, 300 MSa/s and 14-bit resolution for around $118. Ham operators love that its frequency accuracy measures far better than the rated spec (users report ~0.4 ppm against WWV), and it includes 160 arbitrary waveforms plus AM/FM/PM/FSK modulation. Skip it if you need two channels or low-millivolt outputs.

The Koolertron 15MHz DDS is the most-reviewed budget signal generator on Amazon for a reason: it’s the easy, affordable on-ramp to bench testing. Two independent channels, a built-in frequency counter, sweep, 60 user waveform slots and 200 MSa/s cover everything a student or new maker needs for audio, sensor and microcontroller work. 15MHz is more than enough for the vast majority of hobby signals, and the huge owner base means plenty of tutorials and help.

Want a little more headroom than the 15MHz model for almost the same money? The Koolertron 30MHz DDS doubles the sine bandwidth while keeping the same friendly dual-channel layout, frequency counter, sweep and 14-bit output. It’s the value mid-point of the range — comfortable for audio, MCU, IF and entry-level RF experiments — and often sells for around $107, making it one of the best dollar-for-MHz deals on Amazon.

The Seesii FG-615 is the cheapest dual-channel arbitrary generator we’re comfortable recommending. For around $106 you still get two independent outputs, 15MHz sine, 200 MSa/s, a frequency counter and sweep on a compact 2.4-inch LCD. It’s a no-frills DDS clone, but it does the core job — driving test signals into your circuits — reliably, making it a smart pick for a second bench, a classroom set, or a tight first build.

When “good enough” isn’t, the Siglent SDG2042X is the upgrade. Its standout numbers — a blistering 1.2 GSa/s sample rate, 16-bit vertical resolution and 8 Mpts memory — combine with Siglent’s TrueArb and EasyPulse engines to produce arbitrary and pulse waveforms with jitter and distortion that budget DDS units simply can’t touch. With deep modulation, harmonics and rock-solid software, it’s a genuine professional instrument for R&D, calibration and serious audio work.

Want one instrument for years?

Get the Rigol DG1022Z — real benchtop fidelity, deep memory and a trusted brand at ~$311.

Need high bandwidth, small size?

The UNI-T UTG962E gives 60MHz, dual channel and a big 4.3″ screen in a palm-sized case.

Best value with automation?

The OWON DGE2070 packs 70MHz, dual channel and SCPI/LabVIEW control for ~$169.

New to the bench?

Start with the Koolertron 15MHz (or ultra-cheap Seesii FG-615) — dual channel for ~$106–119.

Radio / RF alignment?

The single-channel OWON DGE1060 nails frequency accuracy for HF and scope calibration.

Professional / R&D work?

The Siglent SDG2042X brings 1.2 GSa/s, 16-bit and TrueArb fidelity for demanding labs.

What’s the difference between a function generator and an arbitrary waveform generator?

A pure function generator outputs a fixed set of standard shapes — sine, square, triangle, pulse. An arbitrary waveform generator (AWG) adds the ability to play back any waveform you define point-by-point, from a custom pulse train to a digitized real-world signal. Almost every modern unit, including all eight here, is technically an AWG, so the terms are now used interchangeably. If you want to replay captured or hand-drawn waveforms, just confirm it has a usable arbitrary mode and PC editor.

How much bandwidth do I actually need?

Far less than the marketing suggests. Audio work needs only ~100kHz; microcontroller, sensor and most analog projects are happy under 1–5MHz; and the headline “MHz” usually applies to the sine wave only — squares and pulses top out much lower. A 15MHz unit (Koolertron, Seesii) covers the vast majority of hobby tasks. Reach for 40–70MHz (OWON, UNI-T, Siglent) only if you’re doing IF/RF, fast digital edges, or high-frequency clock work.

Are cheap DDS generators good enough, or should I buy benchtop?

For learning, audio, sensors and general MCU work, a budget DDS unit like the Koolertron or OWON is genuinely good enough and accurate. The benchtop Rigol and Siglent earn their price with lower jitter, cleaner pulses, deeper memory and reliable SCPI automation — things that matter for precise pulse timing, low-distortion audio and scripted, repeatable measurements. Buy budget to learn; upgrade when you hit a real limitation.

Do these generators come with test leads?

Most budget units include one or two BNC-to-BNC and BNC-to-alligator cables, but benchtop models (Rigol, Siglent) often ship with none. Always plan to buy a couple of quality 50 Ω BNC leads and a BNC-to-minigrabber set — they’re inexpensive and make a big difference in signal integrity, especially above a few MHz.

Can I build a Bode plotter with one of these?

Yes — pair a generator that supports SCPI remote control (the OWON DGE2070, Rigol DG1022Z or Siglent SDG2042X) with a compatible oscilloscope or multimeter and you can sweep frequency and automatically plot a circuit’s frequency response. Siglent and Rigol have especially mature software ecosystems for this kind of automated, same-brand measurement.