24Hz to 60Hz PLL?
in [Design]
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From: Jim Thompson on 19 Feb 2010 20:49 On Fri, 19 Feb 2010 20:45:34 -0500, "Michael A. Terrell" <mike.terrell(a)earthlink.net> wrote: > >Jim Thompson wrote: >> >> On Fri, 19 Feb 2010 08:01:31 +0100, "Ban" <bansuri(a)web.de> wrote: >> >> >Jim Thompson wrote: >> >>>>>> Jim Thompson wrote: >> >>> The HC4046s I've used have about a 7 ns deadband. Annoying. >> >>> >> >>> We've done some nice phase/frequency detectors in FPGAs. Rather than >> >>> try to make the outputs do charge pumping, we bring out separate >> >>> hard-CMOS UP and DOWN pulses, and use outboard schottky >> >>> diodes+resistors into the analog stuff. The whole charge pump concept >> >>> is a tad flakey, in my opinion. >> >>> >> >>> I also like single flipflop bang-bang detection for narrowband loops. >> >>> No deadband, and loop gain is infinite! >> >>> >> >>> John >> >>> >> >> >> >> If you implement the "charge pump" current mirrors on-chip, as I >> >> regularly do in my ASIC designs, it becomes a non-issue. >> >> >> > >> >It has been done already many years ago >> >http://ics.nxp.com/products/hc/datasheet/74hc7046a.pdf >> >ciao Ban >> > >> >> Of course "It has been done already many years ago". I invented dirt. >> Also much of modern PLL technology. > > > Come on, Jim. We all know that the dirt was just a byproduct of you >doing your designs with chisels, on stone tablets. ;-) By 1967-68, when I was doing PLL, we already had quadrille pads. However we didn't yet have calculators... except for giant Philco on-desk machines bigger than today's towers ;-) ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | 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.
From: Michael A. Terrell on 20 Feb 2010 10:39 Jim Thompson wrote: > > By 1967-68, when I was doing PLL, we already had quadrille pads. > However we didn't yet have calculators... except for giant Philco > on-desk machines bigger than today's towers ;-) I went to a mall in Dothan, Alabama in 1972 or 73 while I was stationed at Ft. Rucker. The mall had two levels. The one at ground level was full, but the underground level only had one store, and all it sold was calculators. I wondered for years how long it lasted. :) -- Greed is the root of all eBay.
From: krw on 20 Feb 2010 11:27 On Sat, 20 Feb 2010 10:39:36 -0500, "Michael A. Terrell" <mike.terrell(a)earthlink.net> wrote: > >Jim Thompson wrote: >> >> By 1967-68, when I was doing PLL, we already had quadrille pads. >> However we didn't yet have calculators... except for giant Philco >> on-desk machines bigger than today's towers ;-) > > > I went to a mall in Dothan, Alabama in 1972 or 73 while I was >stationed at Ft. Rucker. The mall had two levels. The one at ground >level was full, but the underground level only had one store, and all it >sold was calculators. I wondered for years how long it lasted. :) I'm surprised they didn't have "The Scotch Tape Store" or "Spatula City". ;-)
From: Michael A. Terrell on 21 Feb 2010 02:44 krw wrote: > > On Sat, 20 Feb 2010 10:39:36 -0500, "Michael A. Terrell" > <mike.terrell(a)earthlink.net> wrote: > > > > >Jim Thompson wrote: > >> > >> By 1967-68, when I was doing PLL, we already had quadrille pads. > >> However we didn't yet have calculators... except for giant Philco > >> on-desk machines bigger than today's towers ;-) > > > > > > I went to a mall in Dothan, Alabama in 1972 or 73 while I was > >stationed at Ft. Rucker. The mall had two levels. The one at ground > >level was full, but the underground level only had one store, and all it > >sold was calculators. I wondered for years how long it lasted. :) > > I'm surprised they didn't have "The Scotch Tape Store" or "Spatula > City". ;-) No, just $400 to $600 calculators and over 50 storefronts that were still vacant. -- Greed is the root of all eBay.
From: Greegor on 6 Mar 2010 05:14
On Feb 13, 10:20 am, Vladimir Vassilevsky <nos...(a)nowhere.com> wrote: > MooseFET wrote: > > On Feb 12, 3:01 pm, Vladimir Vassilevsky <nos...(a)nowhere.com> wrote: > > >>Chris wrote: > > >>>I need to make aPLLthat slaves to a24Hzsquare wave. The output of > >>>the loop would be a60Hzsquare wave. Any CMOS level chips that would > >>>be good for this? I understand that I would need to divide by a > >>>decimal value of 2.5 for the loop. > > >>Use a PIC. > > > No, the 8051 is the right processor for this. > > Personally I despise PICs. However PIC became a generic word for any > small microcontroller. Once a customer asked me if I work with PIC > controllers made by AVR company. AVR? Is that one of the Z80 compatible chips the Chinese use to run MP/3 players, cameras etc? I'd like to see 8 bit CP/M running on one and starting with an MP/3 player with flash memory, USB and an LCD for cheap would make it more interesting. See the CP/M usenet group. > Vladimir Vassilevsky > DSP and Mixed Signal Design Consultanthttp://www.abvolt.com |