Turn your Rigol DS1052E Oscilloscope into a 100MHz DS1102E
in [Design]
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From: John Larkin on 5 Apr 2010 14:54 On Mon, 05 Apr 2010 14:30:50 -0400, Phil Hobbs <pcdhSpamMeSenseless(a)electrooptical.net> wrote: >On 4/5/2010 2:23 PM, John Larkin wrote: >> On Mon, 5 Apr 2010 11:17:56 -0700, "Joel Koltner" >> <zapwireDASHgroups(a)yahoo.com> wrote: >> >>> "John Larkin"<jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote in message >>> news:q90kr5pda1mtti9pea5c7tqmao0u9qvfpi(a)4ax.com... >>>> Rigol is like >>>> someone who used to leave their front door unlocked, until someone >>>> wandered in and stole something, so now they have to lock it. >>> >>> I think it's more like Rigol sells houses, and you bought a two-bedroom house >>> (although you're aware they also sell three-bedroom houses)... and one day you >>> notice (or Dave Jones metnions that) there's another door in your home. >>> There's no lock on that door, no sign on it saying, "keep out!," etc. Your >>> ne'er-do-well liberal democrat son moves back home after flunking out of his >>> liberal studies program at the local college and you get to thinking... having >>> that kid spend his nights in his own room rather than sleeping on the couch in >>> the living room every night would be nice... I wonder what's behind that door? >>> >>> :-) >> >> Not entirely the same. It costs money to build rooms, but it costs >> nothing to enable IP. Both have market value. >> >> But why didn't they do the 50 and even 20 MHz bandwidth limits >> digitally? They have 1G samples/second to work with. There are some >> saturation issues that might be best handled with analog limiting, but >> this *is* a cheap scope. >> >> John >> > >One possible reason is that with an analogue bandwidth limit, signals >that would be aliased get attenuated before sampling. > But it's a 1 GHz sample rate. If it's analog limited to 100 MHz, they can do most anything with it. Decimating won't create aliases, will it? John
From: Nico Coesel on 5 Apr 2010 17:08 John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >On Mon, 05 Apr 2010 14:30:50 -0400, Phil Hobbs ><pcdhSpamMeSenseless(a)electrooptical.net> wrote: > >>On 4/5/2010 2:23 PM, John Larkin wrote: >>> On Mon, 5 Apr 2010 11:17:56 -0700, "Joel Koltner" >>> <zapwireDASHgroups(a)yahoo.com> wrote: >>> >>>> "John Larkin"<jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote in message >>>> news:q90kr5pda1mtti9pea5c7tqmao0u9qvfpi(a)4ax.com... >>>>> Rigol is like >>>>> someone who used to leave their front door unlocked, until someone >>>>> wandered in and stole something, so now they have to lock it. >>>> >>>> I think it's more like Rigol sells houses, and you bought a two-bedroom house >>>> (although you're aware they also sell three-bedroom houses)... and one day you >>>> notice (or Dave Jones metnions that) there's another door in your home. >>>> There's no lock on that door, no sign on it saying, "keep out!," etc. Your >>>> ne'er-do-well liberal democrat son moves back home after flunking out of his >>>> liberal studies program at the local college and you get to thinking... having >>>> that kid spend his nights in his own room rather than sleeping on the couch in >>>> the living room every night would be nice... I wonder what's behind that door? >>>> >>>> :-) >>> >>> Not entirely the same. It costs money to build rooms, but it costs >>> nothing to enable IP. Both have market value. >>> >>> But why didn't they do the 50 and even 20 MHz bandwidth limits >>> digitally? They have 1G samples/second to work with. There are some >>> saturation issues that might be best handled with analog limiting, but >>> this *is* a cheap scope. >>> >>> John >>> >> >>One possible reason is that with an analogue bandwidth limit, signals >>that would be aliased get attenuated before sampling. >> > >But it's a 1 GHz sample rate. If it's analog limited to 100 MHz, they >can do most anything with it. Decimating won't create aliases, will >it? That depends on the steepness of the input filtering. It will need to roll-off more than 48dB not to have any aliasing products at fs/2. I doubt they decimate. 2GB/s is a lot to handle by the low cost FPGA they use (Altera Cyclone IIRC). I strongly doubt digital realtime filtering is feasible. -- Failure does not prove something is impossible, failure simply indicates you are not using the right tools... nico(a)nctdevpuntnl (punt=.) --------------------------------------------------------------
From: krw on 5 Apr 2010 18:03 On Mon, 5 Apr 2010 11:17:56 -0700, "Joel Koltner" <zapwireDASHgroups(a)yahoo.com> wrote: >"John Larkin" <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote in message >news:q90kr5pda1mtti9pea5c7tqmao0u9qvfpi(a)4ax.com... >> Rigol is like >> someone who used to leave their front door unlocked, until someone >> wandered in and stole something, so now they have to lock it. > >I think it's more like Rigol sells houses, and you bought a two-bedroom house >(although you're aware they also sell three-bedroom houses)... and one day you >notice (or Dave Jones metnions that) there's another door in your home. >There's no lock on that door, no sign on it saying, "keep out!," etc. Your >ne'er-do-well liberal democrat son moves back home after flunking out of his >liberal studies program at the local college and you get to thinking... having >that kid spend his nights in his own room rather than sleeping on the couch in >the living room every night would be nice... I wonder what's behind that door? > >:-) Nah, nail the door shut and throw the lazy bum out. He won't be a liberal Democrat long.
From: Joel Koltner on 5 Apr 2010 18:31 <krw(a)att.bizzzzzzzzzzzz> wrote in message news:ffnkr5p2em11l7p3icre6fesqva8n3s930(a)4ax.com... > Nah, nail the door shut and throw the lazy bum out. He won't be a liberal > Democrat long. Sure he will, he needs to keep all those entitlements coming in so that he doesn't have to work any time soon. :-)
From: krw on 5 Apr 2010 18:43
On Mon, 5 Apr 2010 15:31:28 -0700, "Joel Koltner" <zapwireDASHgroups(a)yahoo.com> wrote: ><krw(a)att.bizzzzzzzzzzzz> wrote in message >news:ffnkr5p2em11l7p3icre6fesqva8n3s930(a)4ax.com... >> Nah, nail the door shut and throw the lazy bum out. He won't be a liberal >> Democrat long. > >Sure he will, he needs to keep all those entitlements coming in so that he >doesn't have to work any time soon. :-) Nope. White males from middle class families don't get entitlements. |