Method and Apparatus for a High Bandwidth Oscilloscope Utilizing Multiple Channel Digital Bandwidth Interleaving

摘要

A method of digitizing an analog signal is provided, comprising the steps of separating the analog signal spanning a frequency range into a plurality of frequency bands, each frequency band spanning a corresponding predefined frequency range, at least a portion of each of the plurality of corresponding frequency ranges not overlapping any other of the plurality of corresponding predefined frequency ranges and then translating at least one of the signals in the plurality of frequency bands to a lower frequency band in accordance with a local oscillator and digitizing the at least one translated signal with digitizing elements having a frequency range less than the analog signal frequency range. A fixed relationship of the phase of the local oscillator and a repetitive signal generated in accordance with a writing to a circular buffer of the digitized representation of the at least one of the plurality of frequency bands is then defined. Signals corresponding to the other of the plurality of frequency bands are digitized and written to corresponding circular buffers in accordance with one or more corresponding local oscillators. Finally, a digital representation of the analog signal is formed from the digitized signals, the digital representation substantially spanning the frequency range of the analog signal, and the digital representation is stored in a computer readable medium.