On Sat, 31 May 2014 18:42:36 +0100, "Kevin Aylward" <ExtractkevinRemove@kevinaylward.co.uk> wrote:>>"Jim Thompson" wrote in message >>news:6jsjo95p6dklru3r8d4lb12f18ulumt1q7@4ax.com... > >>Shows your ignorance, VCC is for analog, VDD for digital. > >Oh... ? > >VCC - Voltage Collector Collector, VDD Voltage Drain Drain, VEE Emitter >Emitter, VSS Voltage Source Source > >older guys = bipolar design = VCC/VEE >younger guys = mos design = VDD/VSSI'm glad you think I'm "younger". ;-) (though I rarely use VSS).>I have never heard of any reference to VDD as a digital designator. When >was TTL ever VDD ?I have seen VDDA and VDDD (and likewise DGND, AGND, GNDA, and all sorts of other combinations) on parts, as well as schematics. I generally use something like "5V0A" on schematics, though. I want to know what it is when I'm debugging and there are usually too many supplies to just use VDD (which one?), or such.
Headphone amp simulation
Started by ●May 26, 2014
Reply by ●May 31, 20142014-05-31
Reply by ●May 31, 20142014-05-31
On Sat, 31 May 2014 19:54:19 +0100, "Kevin Aylward" <ExtractkevinRemove@kevinaylward.co.uk> wrote:>"Jim Thompson" wrote in message >news:257ko9p9i1j3r932v4rlsk6na4qveuhpts@4ax.com... > >>>Its pretty much impossible today to even find designers that >>>that know bipolar at all, i.e. gm=40.IC > >>I agree with that. I cut my teeth on bipolar... it was probably close >>to 20 years into my career before I did a CMOS design... my first >>CAD-based as well. > >>However I could just as easily design with tubes (valves for you UK >>types :) > >I am a guitar player, I know all about tubes. I was getting electrocuted >when I was 14. > >> though I've not had a commercial application. > >Take up guitar then. > >Kevin Aylward B.Sc. >www.kevinaylward.co.uk >www.anasoft.co.uk - SuperSpiceI grew up in a radio an TV repair shop... built many a "HiFi" amplifier, starting with 6V6... 6L6... finally KT88's, then went "solid state" when I went to Motorola after M.I.T. (Also built several Dynaco kits.) ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
Reply by ●May 31, 20142014-05-31
On Sat, 31 May 2014 19:53:33 +0100, "Kevin Aylward" <ExtractkevinRemove@kevinaylward.co.uk> wrote:>"Jim Thompson" wrote in message >news:ih7ko9d05f9hs7ocglnpa881j0fu3sbvtc@4ax.com... > >On Sat, 31 May 2014 19:15:45 +0100, "Kevin Aylward" ><ExtractkevinRemove@kevinaylward.co.uk> wrote: > >>"Jim Thompson" wrote in message >>news:b5rjo95uttogfb33gj2s9sqvge8871be74@4ax.com... >> >>> Carried my little Lenovo laptop with me. Customer >>>had the full Cadence toolset. I quickly showed that I could run >>>circles around the Cadence stuff using my laptop, so I designed all >>>the analog portions of the chip >> >>>I don't see this is a comparison of Cadence tools against Junior level >>>tools, I see it as a comparison between experienced, expert professionals, >>>with Junior Competency level engineers. > >>I quite assure you that I can enter schematics faster in PSpice >>(MicroSim) Schematics than you can in Virtuoso... those pull-down >>menus are a time waster. > >Its the whole environment. Cadence is really quick to work with symbols and >schematics and building up a hierarchically design, with modified versions >of schematics. I have yet to see any capture program that beats the auto >rout wiring/rubberbanding of Cadence. Its totally rectangular from any >point to any point.That's what MicroSim Schematics does... better than Cadense, which is why they killed it off... can't have a cheap tool that's better than the over-priced Cadense.> >> Plus... in many instances, PSpice simulates >>faster... particularly on the typical network _workgroup_ crap. > >There are issues with simulation on smaller circuits. I have even been >running SuperSpice 20 times faster on some circuits. > >For bigger sims, and running the latest APS with multicore support Spectre >can run very fast. However, Berkley Design Automation has a plug into >Cadence environment FastSpice that screams 10+ times faster still. A point >here is that everyone targets the Cadence environment. > >Kevin Aylward B.Sc. >www.kevinaylward.co.uk >www.anasoft.co.uk - SuperSpiceAnalog, or Digital? ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
Reply by ●May 31, 20142014-05-31
"Jim Thompson" <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote in message news:257ko9p9i1j3r932v4rlsk6na4qveuhpts@4ax.com...> However I could just as easily design with tubes (valves for you UK > types :), though I've not had a commercial application.Surely, a hard sell to the kinds of clients shopping for IC designs. Until (or if) they ever succeed in making the tiny kind reliable. Tim -- Seven Transistor Labs Electrical Engineering Consultation Website: http://seventransistorlabs.com
Reply by ●May 31, 20142014-05-31
On Sat, 31 May 2014 15:04:44 -0500, "Tim Williams" <tmoranwms@charter.net> wrote:>"Jim Thompson" <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote >in message news:257ko9p9i1j3r932v4rlsk6na4qveuhpts@4ax.com... >> However I could just as easily design with tubes (valves for you UK >> types :), though I've not had a commercial application. > >Surely, a hard sell to the kinds of clients shopping for IC designs.Indeed :-D> >Until (or if) they ever succeed in making the tiny kind reliable. > >TimI have a 6DS4 (RCA Nuvistor) sitting here on my desk... and I've seen photos of experimental devices about the size of a surface mount capacitor. For lots of HV applications I'm surprised that no one (*) has thought to put a transistor under the cathode of a tube... a lot more durable that a Power FET. (*) Maybe someone has, somewhere? ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
Reply by ●May 31, 20142014-05-31
jeroen Belleman <jeroen@nospam.please> writes:> On 31/05/14 19:48, Jim Thompson wrote: > [...] >> >> That Long Island design was for a clutch controller for heavy >> trucks... carefully controlled application and release... no jerky >> starts and wear minimized ;-) The whole world doesn't revolve around >> 10GHz uP's... there are lots of tasks that don't take that kind of >> speed. [...] >> ...Jim Thompson >> > > Haha! That reminds me of a citation I picked up some years ago: > > "A slower system like cruise control can typically be handled by > a mid-level processor such as a 700MHz x86 ..." > -- Shawn Liu of National Instruments in "Embedded Design", November 2002Well if you will use Labview to control your car... -- John Devereux
Reply by ●May 31, 20142014-05-31
Den l=F8rdag den 31. maj 2014 20.29.46 UTC+2 skrev Jim Thompson:> On Sat, 31 May 2014 20:23:56 +0200, jeroen Belleman >=20 > <jeroen@nospam.please> wrote: >=20 >=20 >=20 > >On 31/05/14 19:48, Jim Thompson wrote: >=20 > >[...] >=20 > >> >=20 > >> That Long Island design was for a clutch controller for heavy >=20 > >> trucks... carefully controlled application and release... no jerky >=20 > >> starts and wear minimized ;-) The whole world doesn't revolve around >=20 > >> 10GHz uP's... there are lots of tasks that don't take that kind of >=20 > >> speed. [...] >=20 > >> ...Jim Thompson >=20 > >> >=20 > > >=20 > >Haha! That reminds me of a citation I picked up some years ago: >=20 > > >=20 > >"A slower system like cruise control can typically be handled by >=20 > >a mid-level processor such as a 700MHz x86 ..." >=20 > >-- Shawn Liu of National Instruments in "Embedded Design", November 2002 >=20 > > >=20 > >Jeroen Belleman >=20 >=20 >=20 > We did have a clock... 5MHz... divided down to 156kHz for the sampling >=20 > (flipping a magnetic sensor and synchronous demod... modeling >=20 > mentioned in prior posts ;-) >=20was it signal conditioning for sensors and power control for actuators? I can't imagine anything like that build in this century not controlled by= =20 an MCU.=20 -Lasse
Reply by ●May 31, 20142014-05-31
On Sat, 31 May 2014 14:56:25 -0700 (PDT), Lasse Langwadt Christensen <langwadt@fonz.dk> wrote:>Den l�rdag den 31. maj 2014 20.29.46 UTC+2 skrev Jim Thompson: >> On Sat, 31 May 2014 20:23:56 +0200, jeroen Belleman >> >> <jeroen@nospam.please> wrote: >> >> >> >> >On 31/05/14 19:48, Jim Thompson wrote: >> >> >[...] >> >> >> >> >> >> That Long Island design was for a clutch controller for heavy >> >> >> trucks... carefully controlled application and release... no jerky >> >> >> starts and wear minimized ;-) The whole world doesn't revolve around >> >> >> 10GHz uP's... there are lots of tasks that don't take that kind of >> >> >> speed. [...] >> >> >> ...Jim Thompson >> >> >> >> >> > >> >> >Haha! That reminds me of a citation I picked up some years ago: >> >> > >> >> >"A slower system like cruise control can typically be handled by >> >> >a mid-level processor such as a 700MHz x86 ..." >> >> >-- Shawn Liu of National Instruments in "Embedded Design", November 2002 >> >> > >> >> >Jeroen Belleman >> >> >> >> We did have a clock... 5MHz... divided down to 156kHz for the sampling >> >> (flipping a magnetic sensor and synchronous demod... modeling >> >> mentioned in prior posts ;-) >> > >was it signal conditioning for sensors and power control for actuators? > >I can't imagine anything like that build in this century not controlled by >an MCU. > >-LasseMCU's can crunch numbers and do sequential things... but they don't do signal conditioning. There was a quasi-MCU included in the chip core... Cadence provided that part, no less >:-} ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
Reply by ●May 31, 20142014-05-31
Den s=C3=B8ndag den 1. juni 2014 02.51.25 UTC+2 skrev Jim Thompson:> On Sat, 31 May 2014 14:56:25 -0700 (PDT), Lasse Langwadt Christensen >=20 > <langwadt@fonz.dk> wrote: >=20 >=20 >=20 > >Den l=EF=BF=BDrdag den 31. maj 2014 20.29.46 UTC+2 skrev Jim Thompson: >=20 > >> On Sat, 31 May 2014 20:23:56 +0200, jeroen Belleman >=20 > >>=20 >=20 > >> <jeroen@nospam.please> wrote: >=20 > >>=20 >=20 > >>=20 >=20 > >>=20 >=20 > >> >On 31/05/14 19:48, Jim Thompson wrote: >=20 > >>=20 >=20 > >> >[...] >=20 > >>=20 >=20 > >> >> >=20 > >>=20 >=20 > >> >> That Long Island design was for a clutch controller for heavy >=20 > >>=20 >=20 > >> >> trucks... carefully controlled application and release... no jerky >=20 > >>=20 >=20 > >> >> starts and wear minimized ;-) The whole world doesn't revolve arou=nd>=20 > >>=20 >=20 > >> >> 10GHz uP's... there are lots of tasks that don't take that kind of >=20 > >>=20 >=20 > >> >> speed. [...] >=20 > >>=20 >=20 > >> >> ...Jim Thompson >=20 > >>=20 >=20 > >> >> >=20 > >>=20 >=20 > >> > >=20 > >>=20 >=20 > >> >Haha! That reminds me of a citation I picked up some years ago: >=20 > >>=20 >=20 > >> > >=20 > >>=20 >=20 > >> >"A slower system like cruise control can typically be handled by >=20 > >>=20 >=20 > >> >a mid-level processor such as a 700MHz x86 ..." >=20 > >>=20 >=20 > >> >-- Shawn Liu of National Instruments in "Embedded Design", November 2=002>=20 > >>=20 >=20 > >> > >=20 > >>=20 >=20 > >> >Jeroen Belleman >=20 > >>=20 >=20 > >>=20 >=20 > >>=20 >=20 > >> We did have a clock... 5MHz... divided down to 156kHz for the sampling >=20 > >>=20 >=20 > >> (flipping a magnetic sensor and synchronous demod... modeling >=20 > >>=20 >=20 > >> mentioned in prior posts ;-) >=20 > >>=20 >=20 > > >=20 > >was it signal conditioning for sensors and power control for actuators? >=20 > > >=20 > >I can't imagine anything like that build in this century not controlled =by=20>=20 > >an MCU.=20 >=20 > > >=20 > >-Lasse >=20 >=20 >=20 > MCU's can crunch numbers and do sequential things... but they don't do >=20 > signal conditioning. >=20 >=20 >=20 > There was a quasi-MCU included in the chip core... Cadence provided >=20 > that part, no less >:-} >=20that's kinda what I meant, no one would do it with out some kind of program= mable controller so it would have to be front end for an MCU or have an MCU added= to the chip=20 -Lasse
Reply by ●May 31, 20142014-05-31
On Sat, 31 May 2014 18:07:25 -0700 (PDT), Lasse Langwadt Christensen <langwadt@fonz.dk> wrote:>Den s�ndag den 1. juni 2014 02.51.25 UTC+2 skrev Jim Thompson: >> On Sat, 31 May 2014 14:56:25 -0700 (PDT), Lasse Langwadt Christensen >> >> <langwadt@fonz.dk> wrote: >> >> >> >> >Den l?rdag den 31. maj 2014 20.29.46 UTC+2 skrev Jim Thompson: >> >> >> On Sat, 31 May 2014 20:23:56 +0200, jeroen Belleman >> >> >> >> >> >> <jeroen@nospam.please> wrote: >> >> >> >> >> >> >> >> >> >> >> >> >On 31/05/14 19:48, Jim Thompson wrote: >> >> >> >> >> >> >[...] >> >> >> >> >> >> >> >> >> >> >> >> >> >> That Long Island design was for a clutch controller for heavy >> >> >> >> >> >> >> trucks... carefully controlled application and release... no jerky >> >> >> >> >> >> >> starts and wear minimized ;-) The whole world doesn't revolve around >> >> >> >> >> >> >> 10GHz uP's... there are lots of tasks that don't take that kind of >> >> >> >> >> >> >> speed. [...] >> >> >> >> >> >> >> ...Jim Thompson >> >> >> >> >> >> >> >> >> >> >> >> >> > >> >> >> >> >> >> >Haha! That reminds me of a citation I picked up some years ago: >> >> >> >> >> >> > >> >> >> >> >> >> >"A slower system like cruise control can typically be handled by >> >> >> >> >> >> >a mid-level processor such as a 700MHz x86 ..." >> >> >> >> >> >> >-- Shawn Liu of National Instruments in "Embedded Design", November 2002 >> >> >> >> >> >> > >> >> >> >> >> >> >Jeroen Belleman >> >> >> >> >> >> >> >> >> >> >> >> We did have a clock... 5MHz... divided down to 156kHz for the sampling >> >> >> >> >> >> (flipping a magnetic sensor and synchronous demod... modeling >> >> >> >> >> >> mentioned in prior posts ;-) >> >> >> >> >> > >> >> >was it signal conditioning for sensors and power control for actuators? >> >> > >> >> >I can't imagine anything like that build in this century not controlled by >> >> >an MCU. >> >> > >> >> >-Lasse >> >> >> >> MCU's can crunch numbers and do sequential things... but they don't do >> >> signal conditioning. >> >> >> >> There was a quasi-MCU included in the chip core... Cadence provided >> >> that part, no less >:-} >> > >that's kinda what I meant, no one would do it with out some kind of programmable >controller so it would have to be front end for an MCU or have an MCU added to the chip > >-LasseMy customer bought the MCU core IP from Cadence and I added the signal conditioning around it, with glue logic (and MCU programming) provided by Mark Tse (quite a talent)... who thought I was around 50 years old... and was quite surprised when I told him I was coming up on 72 (at that time). Now my next milestone is 3/4C :-D ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
