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From: Jamie on 24 Jul 2010 11:42
rahulponna wrote:
> Hi,
>
> Firstly the reason I have the constraints of not using diodes is that the
> AC input voltage is very low (200mV) and even low voltage Schottkey diodes
> have a forward drop of (230mV). And regarding external power supply, this
> circuit is aimed at energy harvesting, so the aim is to do everything with
> only the harvested energy.
>
> Any ideas?
>
Not knowing your freq requirements... I would say using a precision
rectifier that can put gain on your weak signal will do..

http://en.wikipedia.org/wiki/Precision_rectifier

Looking at the "Improved Circuit" should give you some ideas.

You didn't say what was the max voltage coming in?

From: Grant on 24 Jul 2010 14:16
On Sat, 24 Jul 2010 11:42:50 -0400, Jamie <jamie_ka1lpa_not_valid_after_ka1lpa_(a)charter.net> wrote:

>rahulponna wrote:
>> Hi,
>>
>> Firstly the reason I have the constraints of not using diodes is that the
>> AC input voltage is very low (200mV) and even low voltage Schottkey diodes
>> have a forward drop of (230mV). And regarding external power supply, this
>> circuit is aimed at energy harvesting, so the aim is to do everything with
>> only the harvested energy.
>>
>> Any ideas?
>>
>Not knowing your freq requirements... I would say using a precision
>rectifier that can put gain on your weak signal will do..
>
>http://en.wikipedia.org/wiki/Precision_rectifier
>
> Looking at the "Improved Circuit" should give you some ideas.
>
> You didn't say what was the max voltage coming in?

Did you miss the 'energy harvesting' point? There's chips designed
for this area, one announced recently and pointed out upthread by
another poster.

Grant.
From: rahulponna on 24 Jul 2010 22:25
rahulponna had written this in response to
http://www.electrondepot.com/electrodesign/Re-AC-to-DC-conversion-without-using-diodes-and-no-external-484602-.htm
:

Jamie wrote:

I am looking at a frequency of 950MHz. the input voltage is 200mV (peak).
Also for precision rectifier I have to use external supply for the op amp.
I need to make all my electronics work with the harvested energy.


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From: rahulponna on 24 Jul 2010 22:27
rahulponna had written this in response to
http://www.electrondepot.com/electrodesign/Re-AC-to-DC-conversion-without-using-diodes-and-no-external-484376-.htm
:

a7yvm109gf5d1(a)netzero.com wrote:


thanks for the suggestion. Can you please give me more info on how to use
back diodes for rectification? If you could point me to some links it
would be great. I am trying to google on usage of back diodes for
rectification.


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From: rahulponna on 24 Jul 2010 22:28
rahulponna had written this in response to
http://www.electrondepot.com/electrodesign/Re-AC-to-DC-conversion-without-using-diodes-and-no-external-484404-.htm
:

amdx wrote:


950MHz


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