Overview

The UNI-T UTG4164X is the mid-range sweet spot of the UTG4000X Performance Series—160 MHz sine wave output across four equal-performance channels, 2.5 GSa/s sampling, 16-bit resolution, and 128 Mpts waveform memory. That frequency headroom matters: 160 MHz covers the clock rates and carrier frequencies of high-speed embedded systems, intermediate-frequency (IF) signal chains, and VHF-range wireless protocols that 100 MHz instruments can't reach, while the 80 MHz square wave and pulse output handles fast digital timing and gate drive simulation that lower-bandwidth models leave on the table.

If you're designing products where signal frequencies push past 100 MHz—high-speed serial interfaces, IF processing stages, VHF communications, or fast clock distribution networks—the UTG4164X delivers the bandwidth you need without jumping to the cost of 250 MHz instruments. You still get the full UTG4000X feature set: 15 modulation types, digital protocol generation (SPI, I²C, UART), multi-pulse, multi-tone, sequence, IQ output, and a built-in 800 MHz frequency counter. Four channels, each fully independent, from a single instrument at a single price point.

100 MHz waveform generators cover a lot of ground, but there's a class of applications that starts just beyond that limit. IF signal processing typically operates at 70–160 MHz. VHF communications and test signals extend to 174 MHz. High-speed clock distribution in modern FPGAs and SoCs frequently runs at 125–156 MHz. Fast SPI interfaces on high-performance ADCs and DACs clock at 100+ MHz. A 100 MHz generator can't touch these applications—a 160 MHz generator handles them with headroom to spare.

The 80 MHz square/pulse specification is equally important. Sub-2 ns rise and fall times at 80 MHz mean you can generate clean digital timing stimuli for testing setup/hold times, propagation delays, and clock distribution networks at speeds relevant to modern embedded systems. At 100 MHz instruments' typical 50 MHz square wave limit, you're restricted to slower clocking scenarios.

The UTG4164X sits in the practical sweet spot: enough bandwidth for high-speed embedded, IF, and VHF work, without the premium of 250 MHz instruments. If your applications stay below 100 MHz, the UTG4104X covers you with an identical feature set at a lower price point. If you regularly need frequencies above 160 MHz, step up to the UTG4254X at 250 MHz. But for the large number of engineers working in the 100–160 MHz range, the UTG4164X delivers exactly the capability needed.

High-speed embedded systems don't run on single signals. A typical test setup might require a 125 MHz reference clock on CH1, differential data stimulus on CH2 and CH3, and a synchronization trigger on CH4—all phase-locked and running simultaneously. The UTG4164X provides this with four fully independent channels that can be coupled, merged, or synchronized as your test scenario demands.

Channel coupling links parameters between channels so adjusting frequency or amplitude on one channel automatically tracks on the coupled channel—essential for differential signal generation and matched-pair testing. Channel merge combines channel outputs for complex composite waveforms. Synchronization output maps CH1 sync to CH3 and CH2 sync to CH4, providing timing references for oscilloscope triggering or external equipment coordination.

Each channel maintains independent modulation, triggering, and output control even when coupled. You can run AM modulation on CH1, burst output on CH2, frequency sweep on CH3, and continuous sine on CH4—each at different frequencies and amplitudes, each responding to its own trigger source.

When built-in waveform types aren't enough, the UTG4164X's arbitrary waveform engine stores and reproduces waveforms up to 128 million points per channel. That's 8× deeper than the typical 16 Mpts offered by competing instruments in this price range—and the difference shows up directly in waveform quality and duration.

Why memory depth matters: A 128 Mpts waveform at 2.5 GSa/s playback rate gives you 51.2 milliseconds of non-repeating waveform data at full sample rate. For captured real-world signals—power line disturbances, communication protocol sequences, sensor output profiles—you can replay the exact captured waveform without looping artifacts or truncation. At 16 Mpts, you'd need to downsample by 8× or truncate the waveform, losing the detail that makes the test meaningful.

Point-by-point output mode automatically calculates the output frequency based on waveform length and sampling rate, then plays back every single sample point sequentially—zero interpolation, zero skipped points. This is critical when your arbitrary waveform contains fine timing detail that interpolation would smooth over. DDS mode (default) provides standard frequency-first output for general-purpose use.

The UTG4164X also includes a built-in waveform editor on the touchscreen, plus PC software for complex waveform creation. Import .bsv and .csv waveform files via USB flash drive and store them on the instrument's 16 GB internal storage.

Sometimes the signal you need isn't a standard waveform or a captured trace—it's a mathematical function. Expression mode lets you define waveforms using 18 built-in mathematical functions (sin, cos, tan, exp, log, sqrt, abs, and more) combined with arithmetic operators. Specify the function, set the variable range (start and end values), configure the output frequency and amplitude, and the UTG4164X generates the waveform in real time.

Practical example: You need a damped sinusoid to test a resonant circuit's impulse response. Instead of creating it point-by-point in external software, enter the expression exp(-x/5)*sin(10*x), set the range, and output immediately. Modify the damping factor or frequency on the touchscreen and regenerate—iteration takes seconds instead of the minutes required for arbitrary waveform file editing.

Expression mode is particularly valuable in educational settings where students need to visualize the connection between mathematical functions and physical waveforms, and in R&D environments where engineers explore stimulus variations rapidly during circuit development.