| ??? 05/22/07 14:40 Read: times |
#139628 - Not quite Responding to: ???'s previous message |
Jan Waclawek said:
they cheat. Really, really fast A/D converters are in fact available from e.g. National Semiconductor. Custom built SiGe or GaAs chips could provide even higher speeds. Jan Waclawek said:
It's not unusual to claim "1GHz bandwidth", even if the input attenuation is such that almost nothing except noise gets through at that frequency "Bandwidth" is normally defined as the frequency where the response is down by 3dB. So if that frequency is not 1GHz, the claim is false and it's a lie, rather than a cheat :-(. Jan Waclawek said:
... and of course it is for "repeated signals", as Richard stated above Nothing wrong with that; I have a Tektronix 7704 mainframe with a 7S14 sampling plugin (a design that dates back to the early 70's!) that does indeed have a 1GHz bandwith, even if only for repetitive signals. Over the years it has proven to be a very useful piece of equipment, for it allows me to see things my 100MHz/1GSps TDS2014 does not show me (like the overshoot on a 3V/ns edge at the other end of a 5cm of PCB track). Rob. |
| Topic | Author | Date |
| [OT] DSO- How it's made ? | 01/01/70 00:00 | |
| look at ADC spec's. | 01/01/70 00:00 | |
| in other words, | 01/01/70 00:00 | |
| Not quite | 01/01/70 00:00 | |
| tricks & tricks | 01/01/70 00:00 | |
| Analog memories... | 01/01/70 00:00 | |
| that's what the analog 'scope does! | 01/01/70 00:00 | |
| Some interesting reading from Maxim | 01/01/70 00:00 | |
| I have no doubt you can | 01/01/70 00:00 | |
| use for what | 01/01/70 00:00 | |
| Expansion slot test equipment | 01/01/70 00:00 | |
| there is now a plethora of such with USB | 01/01/70 00:00 | |
| crappy GUI | 01/01/70 00:00 | |
| I prefer the "feel" of manually controlled gear | 01/01/70 00:00 | |
| Can't be done, or just hasn't been done? | 01/01/70 00:00 | |
| there's no reason it couldn't | 01/01/70 00:00 | |
| The PeeCee would get in the way | 01/01/70 00:00 | |
| not only... | 01/01/70 00:00 | |
| a few buttons, dials, and knobs, but not enough | 01/01/70 00:00 | |
Critics and suggestions invited - 1GHz sampler | 01/01/70 00:00 |