Posunutie DC urovne pre AD prevodnik

[Milan]

Inak to trafo sa mi vidi vzdy najlepsie, hlavne ked prepajas 2 zariadenia 
/gal.oddelenie je k nezaplateniu/...

Milan
----- Original Message ----- 
From: "Daniel VALUCH" <daniel.valuch@wanadoo.fr>
To: "HW-news" <hw-list@list.hw.cz>
Sent: Thursday, February 01, 2007 11:10 AM
Subject: Re: Posunutie DC urovne pre AD prevodnik


> ten tam mam, ale je to cele velmi na hrane. Napajanie +/-5V, offset 3.5V, 
> rozkmit signalu 1.6V na obidve strany. To nefunguje velmi dobre.
> Jeden kanal som si osadil transformatorom a nemam ziaden problem okrem 
> toho ze neprenasa jednosmernu zlozku :-) Neznasam operaky...
> b.
>
>
>
>> Message du 01/02/07 11:01
>> De : "Milan" <milger@pobox.sk>
>> A : "HW-news" <hw-list@list.hw.cz>
>> Copie à :
>> Objet : Re: Posunutie DC urovne pre AD prevodnik
>>
>> A nepomohol by ti napr. AD8183 /
>> http://www.analog.com/UploadedFiles/Data_Sheets/AD8138.pdf / alebo nieco
>> podobne?
>>
>> Milan
>> ----- Original Message ----- 
>> From: "Daniel VALUCH" <daniel.valuch@wanadoo.fr>
>> To: <hw-list@list.hw.cz>
>> Sent: Thursday, February 01, 2007 10:41 AM
>> Subject: Posunutie DC urovne pre AD prevodnik
>>
>>
>> potreboval by som nejaku dalsiu inspiraciu, resp. nezavisle nazory :-)
>> Potreboval by som jednosmerne pripojit prevodnik AD9446 ku vstupnemu
>> signalu. Bohuzial prevodnik ma common mode voltage asi 3.5V a znizit sa 
>> neda
>> (so znizovanim Vcm sa vyrazne zhorsuju parametre) a zase operaky, ktore 
>> su
>> vhodne na jeho budenie nezvladaju tak vysoke napatie na vstupe. Otazka 
>> teda
>> je co s tym :-) Posunut DC uroven by slo, okrem diod ma momentalne nic
>> lepsie dostatocne rychle nenapada. Diody samozrejme nikdy nebudu rovnake
>> takze to prinesie nejaky DC offset do merania. Nejake lepsie napady?
>> Pozadovana sirka pasma DC-40MHz, cas ustalenia na 14 bitov tak do 17ns.
>> Najradsej by som tam dal transformator a informaciu samploval na nosnej
>> 20MHz, tam su ale zase ine problemy :-)
>> b.
>>
>>
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