All of the signals are time-correlated so that setup-and-hold time, pulse width, extraneous, or missing data can be viewed. When the input is above the threshold voltage (Vth), the level is said to be “high” or “1.” Conversely, the level below Vth is a “low” or “0.” When a logic analyzer samples input, it stores a “1” or a “0” depending on the level of the signal relative to the voltage threshold.Ī logic analyzer’s waveform timing display is similar to that of a timing diagram found in a data sheet or produced by a simulator. A logic analyzer looks for just two logic levels. Instead, it detects logic threshold levels. Unlike an oscilloscope, a logic analyzer doesn’t measure analog details.
Appropriately scaled logic analyzers are available for those tasks as well. Some complex system designs require thousands of input channels. Logic analyzers typically have between 34 and 136 channels.
But what happens when you need to measure five digital signals simultaneously-or have a digital system with a 32-bit data bus and a 64-bit address bus? You then need a tool with many more inputs. Oscilloscopes generally have up to four input channels. While the oscilloscope is certainly able to look at the same digital signals as a logic analyzer, it is typically used for analog measurements such as rise times and fall times, peak amplitudes, and the elapsed time between edges. Its high sample rate and bandwidth enable it to capture many data points over a span of time, measuring signal transitions (edges), transient events, and small time increments. The digital oscilloscope is the fundamental tool for general-purpose signal viewing. To better understand how the two instruments can address your particular needs, it is useful to start with a comparative look at their individual capabilities. There are similarities between oscilloscopes and logic analyzers, but there are also important differences.
But logic analyzers have come a long way over the last few years, and for many applications they will help reveal the root cause of troublesome bugs in less time than alternative instruments.ĭigital Oscilloscopes Vs. Yet many engineers turn to a digital oscilloscope when they should be turning to a logic analyzer, often because they’re more familiar with oscilloscopes. The logic analyzer is a versatile tool that can help engineers with digital hardware debug, design verification, and embedded software debug. This file type includes high resolution graphics and schematics.
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