Circulating Resampling Digitizer

摘要

Embodiments of the present invention provide improved techniques for sampling events in electrical test equipment such as real-time oscilloscopes. A circulating resampling digitizer uses a delay loop to repeatedly acquire replicas of an input event. The replicas are used to create a series of events which may be output or stored in memory. Signal reconstruction techniques such as interleaving and/or averaging may be applied to the series in order to construct a digital representation of the original input event. The resulting representation may have a higher sample rate, lower noise, and higher vertical resolution than each event in the series. The disclosed techniques use low cost components and can be added to existing instruments with little or no modification.

主权项

1. A real-time oscilloscope comprising:
an external port configured to receive an electrical input signal; a coupling block with first and second inputs and first and second outputs, configured to replicate a signal received at either of the inputs on both of the outputs; wherein the first input of the coupling block is coupled to the external port; a digitizer coupled to the first output of the coupling block, configured to digitize a signal received from the first output in real time; a delay block coupled to the second input and output of the coupling block, configured to delay a signal replicated on the second output and provide the delayed signal to the second input of the coupling block; a memory unit configured to store the digitized signal; and a signal reconstruction block, configured to output a representation of the electrical input signal based on two or more digitized signals.