Oscilloscopes designed to address signal fidelity challenges

09 March 2024

Overall design quality is more important to the actual signal fidelity than just the number of bits on the analog-to-digital converter. There are 3 key facets of design for signal fidelity where SIGLENT’s high-resolution oscilloscopes excel:

  • Noise
  • Gain Accuracy
  • Isolation


Low noise design starts with component selection, EMI, and power cleanliness in the front end. Noise increases with bandwidth and sampling rate. An oscilloscope’s noise can be characterized by range, bandwidth, and configuration. It’s important to start with good performance at full bandwidth and sampling, but the noise can be further optimized by trading off bandwidth and sampling via filtering. SIGLENT oscilloscopes have an additional channel-independent hardware bandwidth limit filter that can further address noise. In some tests, these limits are more effective than filtering. SIGLENT SDS800X HD and SDS1000X HD both specify a typical noise floor @ 200 MHz bandwidth at just 70 uVrms. Instruments with more bandwidth than that use ERES filtering to tradeoff bandwidth for even better noise performance.

Gain Accuracy

Measurement precision requires careful design and innovation throughout the instrument. DC Gain Accuracy is an important component of precision that defines the error in a measurement as the signal moves further away from ground. SIGLENT’s HD Oscilloscopes improve upon gain accuracy beyond competitive oscilloscopes. This makes it possible to accurately visualize signals even as they ride on top of other signals or voltage levels. This is critical to confidently using our expanded scale offsets which are an important visualization tool.


This is the error injected to our signal from another channel's signal path. This is largely related to layout, part quality, and EMI design considerations. It can be important to look out for oscilloscopes with surprisingly low isolation as this may also leave them susceptible to other coupling or noise sources. With up to 3000:1 channel-to-channel isolation, SIGLENT’s new 12 Bit oscilloscopes provide excellent signal quality.

Signal Fidelity by Design

Improved isolation, gain accuracy, and noise performance work together to provide a high signal fidelity platform for measurements and analysis of signals.

SIGLENT’s design for signal quality means we have some of the most accurate high-resolution scopes on the market. SIGLENT demonstrates exceptional accuracy and signal fidelity across the most demanding engineering applications from failure analysis to mixed signal debugging.

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