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From: Spehro Pefhany on 13 May 2010 13:33 On Thu, 13 May 2010 11:02:58 -0500, John O'Flaherty <quiasmox(a)yeeha.com> wrote: >On Thu, 13 May 2010 11:55:21 -0400, Spehro Pefhany ><speffSNIP(a)interlogDOTyou.knowwhat> wrote: > >>On Thu, 13 May 2010 08:19:22 -0700, John Larkin >><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >> >>> >>> >>>http://electronicdesign.com/article/power/non_inverting_level_shifter_requires_only_one_op_amp_one_supply_voltage.aspx >>> >>> >>>Such brilliance! How do they keep doing it? >>> >>>Sarcasm aside, he made a mistake. >>> >>>And we should take up a collection and buy Pease some grid paper. >>> >>>John >> >>The article that links to is by a USSC summer student named Erik, not >>Bob Pease. Nominal gain is 0.75 so it's doing more (less?) than level >>shifting. > >I see attenuation of 1/2 at the input, gain of 4 (3+1), and >attenuation of 1/2 at the output. LTSpice agrees, unless I made a >mistake. Nope, my mistake. 600/200 != 2, apparently. ;-)
From: Michael A. Terrell on 13 May 2010 14:04 John Larkin wrote: > > Pease just drew another one of his hideous scribbles. > > Yes, lots of rusty VWs on his lawn and on the street. > > John Don't they have code enforcement out there? That would get you a huge fine in a lot of states, or even jail time. Some try to claim they are artists, but still end up in jail. -- Anyone wanting to run for any political office in the US should have to have a DD214, and a honorable discharge.
From: Michael A. Terrell on 13 May 2010 14:08 John Larkin wrote: > > On Thu, 13 May 2010 11:55:21 -0400, Spehro Pefhany > <speffSNIP(a)interlogDOTyou.knowwhat> wrote: > > >On Thu, 13 May 2010 08:19:22 -0700, John Larkin > ><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: > > > >> > >> > >>http://electronicdesign.com/article/power/non_inverting_level_shifter_requires_only_one_op_amp_one_supply_voltage.aspx > >> > >> > >>Such brilliance! How do they keep doing it? > >> > >>Sarcasm aside, he made a mistake. > >> > >>And we should take up a collection and buy Pease some grid paper. > >> > >>John > > > >The article that links to is by a USSC summer student named Erik, not > >Bob Pease. Nominal gain is 0.75 so it's doing more (less?) than level > >shifting. > > There are two silly articles in the latest ED, the level shifter and a > nearly-as-silly Pease Porridge. That happens, when your 'Pease Porridge' is over three days old. ;-) -- Anyone wanting to run for any political office in the US should have to have a DD214, and a honorable discharge.
From: Joel Koltner on 13 May 2010 14:11 "Joerg" <invalid(a)invalid.invalid> wrote in message news:852o9dFmo8U1(a)mid.individual.net... > Nowadays it's fairly easy to avoid transistor-level. We have blazingly fast > opamp, MMIC, muxes and so on. Stuff that was expensive back then and would > have come with a huge power consumption penalty. Yeah, but there's some guy on this group who suggests that you often still can replace some spendy parts with a much cheaper discrete (or at least "lower tech" -- avoid those "all in one" ICs) solution too. :-)
From: Joerg on 13 May 2010 14:17
Joel Koltner wrote: > "Joerg" <invalid(a)invalid.invalid> wrote in message > news:852o9dFmo8U1(a)mid.individual.net... >> Nowadays it's fairly easy to avoid transistor-level. We have blazingly >> fast opamp, MMIC, muxes and so on. Stuff that was expensive back then >> and would have come with a huge power consumption penalty. > > Yeah, but there's some guy on this group who suggests that you often > still can replace some spendy parts with a much cheaper discrete (or at > least "lower tech" -- avoid those "all in one" ICs) solution too. :-) > Yep :-) Although the design of such electronics (where price really matters) begins to follow to where it's produced or at least close to it, in Asia. I found that, for example, even younger Japanese engineers are quite familar with transistor-level circuitry. Probably everyone has seen a B-size sheet chock-full of transistors, as if they had used a vise to get them all to fit onto one page. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM. |