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From: linnix on 14 Jul 2010 16:23
On Jul 14, 12:33 pm, john1987 <conphil...(a)hotmail.com> wrote:
> Hi,
>
> The hardware is available on the microcontroller chip. The dedicated
> PWM generator. Am I right? or did you mean that I have to design it
> byself. For example the C8051F411 has a on board 8 bit PWM generator
> that can can go up to 93 KHz of different duty cycles. Am I on the
> right track?
>
> John

Yes, if you are asking for 93KHz at 8 bits, but you are asking for
500KHz at 10 bits. C8051F411 tops at 50MHz. Many small micros top at
50MHz to 70MHz. XCR3032 ($3 ea) top at 213MHz, which can probably
generates 500KHz at 7 to 8 bits.
From: Jim Thompson on 14 Jul 2010 20:43
On Wed, 14 Jul 2010 11:50:33 -0700, Jon Kirwan
<jonk(a)infinitefactors.org> wrote:

>On Wed, 14 Jul 2010 13:21:53 -0500, Vladimir Vassilevsky
><nospam(a)nowhere.com> wrote:
>
>>Jim Thompson wrote:
>>
>>>>You can play fractional-N aka noise shaping games to increase PWM
>>>>resolution. BUT by doing that you increase the high frequency content,
>>>>which modulates the carrier,
>>>
>>> I have in mind an application where I wouldn't care about high
>>> frequency content (really low frequencies).
>>>
>>> Can you point me to some papers on how to accomplish that?
>>
>>A good review on PWM techniques is PhD thesis of K. Nielsen.
>
>http://www.jqiu.net/ftp/Karsten%20Nielsen%27s%20PhD%20Thesis/Volume_I_Title_and_preface.pdf
>
>Jon

Where can I get the whole enchilada ?:-)

...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 |

Obama isn't going to raise your taxes...it's Bush' fault: Not re-
newing the Bush tax cuts will increase the bottom tier rate by 50%
From: Jon Kirwan on 14 Jul 2010 20:56
On Wed, 14 Jul 2010 17:43:46 -0700, Jim Thompson
<To-Email-Use-The-Envelope-Icon(a)On-My-Web-Site.com> wrote:

>On Wed, 14 Jul 2010 11:50:33 -0700, Jon Kirwan
><jonk(a)infinitefactors.org> wrote:
>
>>On Wed, 14 Jul 2010 13:21:53 -0500, Vladimir Vassilevsky
>><nospam(a)nowhere.com> wrote:
>>
>>>Jim Thompson wrote:
>>>
>>>>>You can play fractional-N aka noise shaping games to increase PWM
>>>>>resolution. BUT by doing that you increase the high frequency content,
>>>>>which modulates the carrier,
>>>>
>>>> I have in mind an application where I wouldn't care about high
>>>> frequency content (really low frequencies).
>>>>
>>>> Can you point me to some papers on how to accomplish that?
>>>
>>>A good review on PWM techniques is PhD thesis of K. Nielsen.
>>
>>http://www.jqiu.net/ftp/Karsten%20Nielsen%27s%20PhD%20Thesis/Volume_I_Title_and_preface.pdf
>>
>>Jon
>
>Where can I get the whole enchilada ?:-)

Try:
http://www.icepower.bang-olufsen.com/en/technology/publications/thesis/

Jon
From: Jim Thompson on 14 Jul 2010 21:21
On Wed, 14 Jul 2010 17:56:00 -0700, Jon Kirwan
<jonk(a)infinitefactors.org> wrote:

>On Wed, 14 Jul 2010 17:43:46 -0700, Jim Thompson
><To-Email-Use-The-Envelope-Icon(a)On-My-Web-Site.com> wrote:
>
>>On Wed, 14 Jul 2010 11:50:33 -0700, Jon Kirwan
>><jonk(a)infinitefactors.org> wrote:
>>
>>>On Wed, 14 Jul 2010 13:21:53 -0500, Vladimir Vassilevsky
>>><nospam(a)nowhere.com> wrote:
>>>
>>>>Jim Thompson wrote:
>>>>
>>>>>>You can play fractional-N aka noise shaping games to increase PWM
>>>>>>resolution. BUT by doing that you increase the high frequency content,
>>>>>>which modulates the carrier,
>>>>>
>>>>> I have in mind an application where I wouldn't care about high
>>>>> frequency content (really low frequencies).
>>>>>
>>>>> Can you point me to some papers on how to accomplish that?
>>>>
>>>>A good review on PWM techniques is PhD thesis of K. Nielsen.
>>>
>>>http://www.jqiu.net/ftp/Karsten%20Nielsen%27s%20PhD%20Thesis/Volume_I_Title_and_preface.pdf
>>>
>>>Jon
>>
>>Where can I get the whole enchilada ?:-)
>
>Try:
>http://www.icepower.bang-olufsen.com/en/technology/publications/thesis/
>
>Jon

Thanks!

...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 |

Obama isn't going to raise your taxes...it's Bush' fault: Not re-
newing the Bush tax cuts will increase the bottom tier rate by 50%
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