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This is done by sampling. This aliases the signal down to the range of the oscilloscope. The scale factor of the scope is displayed for the time of the sampled signal.
Another possible method is the same as used in many spectrum analyzers. Hetrodyne the signal down to a lower frequency and display it on a 500 MHz bandwidth or so scope.
most of the scopes in this range is digital scopes which use sampling and ADC , this mean that view the waveform correctly u need at least 80G sample / sec
I don't think the sample rate is 80G samples / sec. The signal under test is a bandpass signal. If the sample rate is n*bandwidth, the bandpass signal will be downconverted to baseband. n = ?
Hi, it is actually called equivalent time sampling oscilloscope. For example, Agilent 86100B Infiniium DCA Wide-Bandwidth Oscilloscope which has Bandwidth to 65 GHz optical and 80 GHz electrical. It is impossible to use high sampler at 65GHz and 80GHz (it is very very expensive and it is still not available now). The sampler used is normally about 2-5 Gsample/s (depends on the model).The technology applied: To measure time domain signal, you need to split the signal into 2, 1 as trigger and the other as input. The scope will sample at a few different interval of the input signal and display the result. For this type of scope, normally it will take a few second to show the result...
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