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Banner specifications are an integral part of oscilloscope design. The three key banner specifications are bandwidth, sample rate, and memory depth. Of the three banner specifications, bandwidth is where oscilloscope vendors invest millions of dollars, hoping to become the market leader. In 2007, Tektronix introduced the world’s first 20 GHz oscilloscope (70000 Series) which featured 16 GHz of analog bandwidth and 20 GHz through a digital signal processing technique known as digital signal processing (DSP) boosting. In 2009, LeCroy introduced the first 30 GHz oscilloscope which featured 16 GHz of pre-amplifier bandwidth and achieved 30 GHz utilizing a frequency interleaving technique which LeCroy termed digital bandwidth interleaving (DBI). Keysight Technologies, Inc. then introduced the world’s first 32 GHz bandwidth oscilloscope in 2010 using raw hardware performance. The Infiniium 90000-X Series oscilloscope has 32 GHz of true analog bandwidth enabled by its Indium Phosphide-designed front end. While all three techniques achieve the bandwidth specified by the vendor, it is important to understand the techniques used to achieve the specifications as thay will influence the representation accuracy of the signal the oscilloscope is measuring.
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