FNIRSI has listed the DPG1122, a dual-channel function and arbitrary waveform generator rated at 120 MHz with a 7-inch touchscreen. The store page shows it at $699.99, marked down 13 percent from $799.99, with an additional $60 coupon. Sampling is 1.2 GSa/s at 16-bit resolution, and the unit is powered over USB-C.
Specifications
The DPG1122 outputs on two independent channels at up to 120 MHz using direct digital synthesis, a method that builds waveforms from stored sample points. It supports sine, square, triangle, pulse, noise, and arbitrary waveforms. FNIRSI lists 214 built-in arbitrary waveforms and custom waveform loading from USB storage. The modulation list covers AM, FM, PM, ASK, FSK, PSK, and PWM, from internal or external sources. The screen is an 800 by 480 capacitive touch panel, and the interfaces are USB, LAN, and a 10 MHz clock connection.
FNIRSI says two technologies shape the output. ZeroSurg limits overshoot to about 1.5 percent typical for cleaner pulse edges, and adjustable rise and fall times give control of edge shape. VeriPoint outputs every stored sample point, without skipping or repeating, to preserve waveform detail and keep jitter low, at up to 8 Mpts. The company notes the waveform screenshots on the page were captured on a DPO1204 oscilloscope.
Hardware and software
The generator has a compact design that FNIRSI says is 30 percent lighter than comparable designs, with a rear wall-mount slot for space-limited labs and classrooms. It runs from USB-C power. The page offers manuals and firmware downloads, and a US or EU plug adapter option. A note says EU orders ship after the EU warehouse restocks, and that buyers who want faster delivery can ask to ship from China, with import duties of about 30 percent.
Signal generation features include burst, sweep, and modulation, with internal, external, or manual triggering.
The arithmetic on the sample rate matters here too. At 1.2 GSa/s, a 120 MHz sine wave gets about 10 samples per cycle, which is enough for a clean sine but leaves little margin for complex waveforms at the top of the range. Arbitrary waveforms at lower frequencies get many more points per cycle, and the VeriPoint feature, at up to 8 Mpts, matters mostly for long custom waveforms. A 16-bit vertical resolution gives 65,536 amplitude steps, finer than the 14-bit converters used in many entry-level generators.
Competition
Siglent's SDG series and Rigol's DG series, which includes the DG1000Z line, are the common benchtop choices for hobbyists and labs, and FNIRSI is aiming at them on price and screen size. TMWB has covered Siglent's SDG1000X Plus generators, which reach 60 MHz and 16 bits, and the DPG1122 lists twice that bandwidth.
A few caveats apply. The specifications on the store page come from FNIRSI, and the page shows one rating from one reviewer. Output amplitude, flatness at the top of the frequency range, and phase noise are not stated on the product page, and those numbers decide how clean a 100 MHz signal actually is. Independent bench tests will matter more than the headline bandwidth. The $699.99 price is a sale price against an $799.99 list, so the figure may change.
The built-in connectivity is better than many budget generators. USB and LAN interfaces let the DPG1122 be driven from a script or a lab PC, and the 10 MHz clock connection allows several instruments to share a timebase. A 7-inch capacitive touchscreen at 800 by 480 makes menu work faster than a knob-and-button interface, and FNIRSI pairs it with a physical keypad and knob, based on the product images.
Direct digital synthesis builds a waveform by stepping through stored sample values at a fixed clock rate, which gives precise frequency control but limits how many points describe each cycle at high frequency. That is why high-frequency outputs from DDS generators look less smooth than low-frequency ones. The accessory photo on the product page shows a power adapter and several cables with the generator, and a plug selector offers US and EU adapters. FNIRSI lists a manual and firmware download on the page.
The $100 markdown plus the $60 coupon the page advertises would bring the price to $639.99 before shipping and tax, and the EU stock note means buyers outside the United States should check delivery times before ordering.
Sources and image credits
- FNIRSI DPG1122 120MHz function and arbitrary waveform generator
- Images: FNIRSI product materials
