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PLL
Sci.Electronics.Design is a worldwide Usenet news group that is used to discuss various aspects of Electronic Circuit Design.
We found 136 threads matching "pll"
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FRONT END WITH PLL
RealInfo - 2009-02-03 03:49:00
Hi all
In a PLL contrlolled Rf amplifier front end how exactly the 1st RF stage
frequency of the tuned circuit is contrlolled so it
will be exactly the PLL freq+ IF frequncy ?
Thanks
EC
...
PLL with very high feedback clock and reference clock dividers
bender - 2009-05-06 22:19:00
I am trying to design a Charge pump PLL with very high feedback and
reference dividers (around 2^15). The input clock is about 150 Mhz but
the output clock will be from 10-150 Mhz. If both N & M (dividers)
values are around 30,000, the Phase detector checks the edges every
220 uS, i.e. the outpu...Re: Uses for old TVs?
2009-06-23 13:52:00
The analog tuners make great spectrum analysers. figure out the
bandswitching and control inputs before dismantling the TV.
Just add a ramp and a 62 or 68 or 45 mhz IF , get one with a pll and
one thats analog VCO and do a tracking generator.
PLL ones can often be modified to step in much s...Lower time jitter in PLL
2008-02-24 17:06:00
Hi,
I have a litte problem with some measurements. I made a simple PLL
(analog phase detector, active PI filter, loop filter bw=100 kHz, by 8
prescaler) to multiply 10MHz from quartz generator to 80MHz.
Signal from quartz generator had phase jitter ~ 0.76 mrad
(10Hz-10kHz), from locked PLL ~ ...Fujitsu microcontroller (8-Bit) Clock Modes Problems
Chris - 2009-01-06 04:16:00
Hi,
I'm programming on a Fujitsu Microcontroller from the MB95Fxxx family
and I'm trying to switch the clock modes. (I'm using the MB95
So I can switch from MAIN-PLL Clock to SUB-PLL Clock without any
problems but I can not switch from SUB-PLL to MAIN-PLL correctly...
I managed to isolate t...Re: overloading wirewound resistors
Joel Koltner - 2009-03-02 18:56:00
"Jim Thompson" wrote in
message news:03soq49q52f2kdpq6r7hqsl8msak8mt63j@4ax.com...
> I've not used spirals for any thing other than in VCO's... at around
> 5GHz.
I would think that the phase noise of such a VCO wouldn't be that great, but
such an oscillator is probably just the heart o...Hum pickup in PLL
Andrew Holme - 2009-05-17 09:54:00
I've completed layout of a PCB which includes a PLL which phase locks a VCXO
to an external standard. I was planning on setting the PLL loop bandwidth
at a few Hz; but I'm worried that it won't be able to remove 50 Hz mains hum
pickup. I would prefer not to electrostatically screen the circu...low jitter PLL
2008-08-09 16:03:00
dear all:
what's the best low jitter PLL on the market? I want to achieve ~20-50
fs jitter from clock generator. $60 is okay.
BR,
Bigboy
...24Hz to 60Hz PLL?
Chris - 2010-02-12 17:14:00
I need to make a PLL that slaves to a 24Hz square wave. The output of
the loop would be a 60Hz square 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.
Thanks,
Chris Maness
...PLL Breadboard Issues
Chris - 2010-02-28 10:25:00
I bread boarded my PLL yesterday. I was able to get it to lock just
fine on a multivibrator running at 33Hz. I was able to solve the
jitter problem by using a very large value for C1 (1000u). However,
when I attached my cameras to the loop, (one running at 22.2fps and
the other running at 25...Re: 24Hz to 60Hz PLL?
krw - 2010-02-20 11:27:00
On Sat, 20 Feb 2010 10:39:36 -0500, "Michael A. Terrell"
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 ;-)...Re: tiny inductor with every bypass cap?
qrk - 2008-06-22 03:15:00
On Sat, 21 Jun 2008 16:06:02 GMT, "Talal Itani"
wrote:
> Hello,
>
> I was looking at the schematics for a DSP-based board, running at 100 MHz.
> They have a tiny inductor with every bypass cap around the DSP. Do you
> think this is necessary? This DSP has analog stuff built-in. If w...PLL and clock in altera cyclone 2 fpga
Jamie Morken - 2008-12-20 00:13:00
Hi,
I am using a cyclone 2 FPGA, and have a propagation delay warning in one
of the megafunction's, lpm_divide. If we use a slower clock to this
block it will work properly, but the system clock is 27MHz which is too
fast for the bit width's of the numerator and denominator even with
pip...Re: fast pulse radio transmission
Michael Brown - 2008-05-08 20:31:00
"sergio108" wrote in message
news:681e324e-8a13-4bf1-a35b-d2c7a23f1355@a1g2000hsb.googlegroups.com...
> Hi All.
> I want to find a transmitters-receivers or transceiver can be used in
> our project.
> We are developing a project where we need to send and receive random
> asynchronous ...Re: Problem with TI TMS320DM6446 and crystal not starting
dalai lamah - 2009-08-15 18:23:00
Un bel giorno KJ digitò:
> > Some crystal oscillators require a 1M resistor across the crytal. Did
> > you try that? What does TI say about this?
> >
>
> The resistor across the crystal is to force some form of 'digital'
> invertor to operate in a linear region. This can also be acco...Re: Wideband quadrature generation
Joel Koltner - 2008-06-18 18:15:00
"Joerg" wrote in message
news:dlf6k.5892$89.2108@nlpi069.nbdc.sbc.com...
> Thing is, once you reach a bandwidth of 10:1 and you want less than a few
> degrees of phase error things tend to become iffy. Laser trim became available later and made life easier.
10:1 is plenty for my purp...Is there a dual NE567?
2008-03-20 17:04:00
I'm currently designing a circuit with two NE567's(tone decoder PLL)
in it, so I'm wondering if there is an IC which contains two tone
decoders.
Thanks in advance
Ferdinand Meyer-Hermann
...Re: AM radio receiver - design
MooseFET - 2009-02-06 19:46:00
On Feb 6, 7:51=A0am, "Joe G \(Home\)" wrote:
> Hi All,
>
> I am looking for a super sensitive / selective AM radio design.
>
> Where I am I get lots of interference ....
>
> Have you seen any good designs on the internet you can suggest.
>
> AM broadcast band =A0500K - 1.6MHz
>...Re: HP 5316A opinion
2009-09-25 16:08:00
A used Jupiter GPS + a 6$ VCXO from ebay + some CMOS as a PLL= WOW.
I did buy a used Rb fo 65$ a while back.
So if the counter has a external REF in ar 5 or 10 Mhz, buy it....
Steve
...Re: How to filter noise when it has the same frequency as the signal
MooseFET - 2008-09-05 12:25:00
On Sep 4, 11:12 pm, "X.Y." wrote:
> It seems that they just has a difference on the magnitude.
>
> P.S. It is a OOK signal on receiver.
>
> The wave on oscillograph can be found on the following link:
>
> http://att.newsmth.net/att.php?s.172.248797.578.png
>
> Thanks in advance!...Re: 24Hz to 60Hz PLL?
Jim Thompson - 2010-02-19 20:49:00
On Fri, 19 Feb 2010 20:45:34 -0500, "Michael A. Terrell"
wrote:
>
> Jim Thompson wrote:
> >
> > On Fri, 19 Feb 2010 08:01:31 +0100, "Ban" wrote:
> >
> > > Jim Thompson wrote:
> > > > > > > > Jim Thompson wrote:
> > > > > The HC4046s I've used have about a 7 ns deadband. A...Re: goofy frequencies
Phil Hobbs - 2009-06-15 12:25:00
John Larkin wrote:
> Suppose I really want a crystal oscillator at, say, 122.167958 MHz.
> And I'd like to have the option of phase locking it to some standard
> reference, 5 or 10 MHz maybe. And I'd like cheap ones for low-end
> products, and TCXO or OCXO stability for better versions.
> ...Re: Series Termination
2009-02-26 11:09:00
I missed two points in my post:
It is a BPSK transmitter.
With a 10 MHz input I couldn't figure out how to get a 1.023 Mhz clock
using only the FPGA PLLs. So, when I get to that point if I still
can't figure out how to generate the clock I'll either add an external
PLL or eliminate the requ...Re: Passive linear circuits
Jamie - 2008-04-18 20:11:00
Steven wrote:
> I'm on a search for two types of passive, linear circuits. The
> first circuit is an amplitude filter. Let me explain.
> Most filter circuits are designed to filter out certain input
> signals according to their frequencies. Is there such a thing as an
> ampl...Re: Pulsing DC Signal Relay Control...
Jan Panteltje - 2008-06-11 10:22:00
On a sunny day (Wed, 11 Jun 2008 09:17:14 -0500) it happened John Fields
wrote in
:
> > He can trigger on the negative going edge ....
>
> ---
> Yes, but then he loses the time from the first high-going edge to the
> first low one if VIN is toggling, and he'll get a false actuation ...Floppy Disk Interfacing
FyberOptic - 2009-05-28 19:58:00
Howdy folks. I've been looking into how floppy drives work again,
interested in tinkering with them myself for fun in projects, but have
some questions. I also wouldn't mind some confirmations/corrections
of my info by folks who actually know about this stuff, unlike
myself!
My basis for al...Re: 24Hz to 60Hz PLL?
John Larkin - 2010-02-18 12:31:00
On Thu, 18 Feb 2010 12:23:49 -0500, Phil Hobbs
wrote:
> On 2/18/2010 10:51 AM, Jim Thompson wrote:
> > On Thu, 18 Feb 2010 10:22:36 -0500, "Michael A. Terrell"
> > wrote:
> >
> > >
> > > Jim Thompson wrote:
> > > >
> > > > Michael A. Terrell wrote:
> > > > >
> > > > > ...Re: Reference pulse, how to extract it?
Frithiof Andreas Jensen - 2008-04-20 06:53:00
"Jacques St-Pierre" skrev i en meddelelse
news:TJ0Oj.129$XI1.109@edtnps91...
> Normally I prefer digital circuit, but analog may also be acceptable if it
> can be simpler or more reliable.
You could lock a PLL to the teeth and clock a state machine (modula 4
counter) with it and X...Re: What is the best display format for large frequency values?
Joop - 2009-09-09 16:29:00
On Tue, 08 Sep 2009 19:31:14 -0400, Phil Hobbs
wrote:
> > Clever to use the 4046 input as input amp :-)
> > I am not using any input amp, just a 100pF capacitor, works great so far too.
>
The idea was borrowed from an AADE (Neil) design.
> It's okay as long as you aren't using PD 2...Re: Infrared LED / detector design
Matt - 2010-02-20 13:47:00
On Feb 20, 12:15=A0am, "m...@sushi.com" wrote:
> On Feb 19, 9:19=A0am, Matt wrote:
>
> > Yea? Thank you, I should have mentioned it's not for data
> > transmission. Sorry about that.
>
> > My idea is an array or Ir units (maybe 3 or 4) around the bot to be
> > used for naviga...Re: Anyone have access to a VHF spectrum analyzer?
Grant - 2008-12-23 22:08:00
"Joel Koltner" wrote in message
news:S0h4l.3915$se4.3886@en-nntp-03.dc1.easynews.com...
> Grant,
>
> I posted some spectrum analyzer screenshots over on ABSE.
>
> I'm still skeptical that there's an easier way to examine the stereo pilot
> than to just FM demodulate and then look...Re: Need help w/level sensor
John Larkin - 2009-12-11 12:02:00
On Fri, 11 Dec 2009 08:48:26 -0800 (PST), "lektric.dan@gmail.com"
wrote:
> On Dec 11, 10:34 am, John Larkin
> wrote:
>
> > The photo thing should work if you have clean open/dark gaps. Maybe
> > you have hum or something fooling the comparator. Check it with an
> > oscilloscope.
...XOSC jitter
Andrew Holme - 2009-08-25 17:36:00
I've got a 10 MHz crystal oscillator :
http://www.iqdfrequencyproducts.com/products/details/181/
mounted on FR4 and phase-locked to an external standard.
Triggering my 'scope off the external standard, at 1ns per cm, I can see
some very low frequency jitter on the XOSC output. If I tap t...Re: SMPS inverter voltage feedback methods
MooseFET - 2008-01-26 13:11:00
On Jan 26, 9:44 am, D from BC wrote:
[...]
> How about this parts intensive idea?
> Do it FM radio style :P
>
> Vin> VCO(1Ghz)> xformer> FM demod> Vout isolated
If you go down to much lower frequencies, the idea works quite well.
At 1MHz or so, the VCO doesn't take very many parts.
...Re: analog circuit to compute sine of voltage
Phil Hobbs - 2008-02-24 01:10:00
JosephKK wrote:
> Robert wrote:
> > Oh, and by the way, an input voltage range corresponding to -180
> > degrees to +180 degrees is sufficient.
>
> Diode wave shaping will get you -90 to +90 degrees and no more.
>
> Only digital will get the range you ask for.
>
Not true. If y...Re: Testing a Video Signal
Phil Allison - 2010-01-19 01:38:00
"bg"
>
> Phil Allison
> "bg"
> >
> > > If the frequency of the burst was off, the color hue would shift, but
> > > you
> > > would still have color.
> >
> > ** Completely WRONG.
> >
> > The phase of the colour sub carrier is what produces hue shifts.
> >
> > Explains why NT...Re: DPSK oscillator quality
Vladimir Vassilevsky - 2007-12-29 15:12:00
"Henry Kiefer" wrote in message
news:47769962$0$16570$9b4e6d93@newsspool1.arcor-online.net...
> Hi folks!
>
> At the moment I'm designing a DPSK transmission system. The question is
> how much bit-error-rate I get dependent on the actual difference of
> oscillator frequency =f(transm...Re: Schematic preferences
mpm - 2010-01-19 08:26:00
On Jan 18, 3:37=A0pm, D Yuniskis wrote:
> Hi,
>
> Of course, this is *highly* subjective -- but, I'd enjoy hearing
> folks' "conventions" used when preparing schematics (that *others*
> will consume -- how you scribble for your own purposes isn't
> important as it depends a lot on wha...Re: Balanced filter -> Balun vs. Balun -> Single-ended filter
Joel Koltner - 2008-04-02 12:41:00
"John Larkin" wrote in message
news:f5t5v39oj6fmd8bjga1uubmffi2ftah79r@4ax.com...
> Gosh, what nonsense. A lot of ADI appnotes are nonsense.
In this case, is it "this is just unnecessary and doesn't really help so it's
a waste of parts"-nonsense or "this is actually harmful compared to t...Re: Signetics C2003P ??
James Arthur - 2008-11-30 18:06:00
Spehro Pefhany wrote:
> Found a rail of these things around in DIP-8 package. Date code 1981
>
> Anyone have an old Signetics catalog around from that era? Can't find
> anything on the net.
>
> Thanks and best regards,
>
> Best regards,
> Spehro Pefhany
Neither Signetics' ...