Enhanced Sample Rate Mode Measurement Precision

Enhanced Sample Rate Mode Measurement Precision

Teledyne Lecroy

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The low-noise system architecture and the tailored frequency response employed in the HDO4000A, HDO6000A, HDO8000A and MDA800A series provides the foundation for enhancing ADC sample rates through additional techniques. In this case, carefully constructed filters combined with a pristine front-end amplifier and a frequency response carefully limited to 1 GHz provide the opportunity to provide more measurement precision than would otherwise be possible. The technique utilized to achieve higher measurement precision is interpolation, and this technique is used by default as an Enhanced Sample Rate up to 10 GS/s. By integrating the Enhanced Sample Rate functionality with the normal Timebase controls for Sample Rate, Time and Acquisition Memory adjustment, the oscilloscopes are optimized for best waveform signal fidelity in all situations.

Summary

This white paper describes how Teledyne LeCroy uses interpolation together with a low-noise front-end, tailored filters, and a limited frequency response to increase effective ADC sample rates and measurement precision. Readers will learn how Enhanced Sample Rate is implemented (up to 10 GS/s) and how it integrates with timebase, sample rate, and acquisition memory controls to improve oscilloscope measurements.

Key Takeaways

Explain how interpolation raises effective sample rate and when it improves measurement precision
Assess the role of front-end amplifiers and tailored filters in lowering noise and preserving signal fidelity
Configure oscilloscope timebase, sample rate, and acquisition memory to enable Enhanced Sample Rate operation (up to 10 GS/s)
Identify the trade-offs and limitations (bandwidth, aliasing, noise floor) when using interpolation-based measurement enhancement

Who Should Read This

Test, measurement, and embedded systems engineers (intermediate to advanced) who design or validate high-speed analog/digital interfaces and need to improve oscilloscope measurement accuracy.

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