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Repost: One more time

> Have a look at the following from Analog Devices...
>                                                             
> AD8015    $2.32
> ADN2820    $30.00
> ADN2821   
> ADN2880    $3.40
> ADN2882    $3.05
> 
> We have the used the AD8015 as a front end for a Gamma detector where 
> the BW requed was 200MHz. Input current pulse was in the order of 25uA.
> 
> Nino.
> 
> Peter wrote:
> 
>>
>>
>> On Sun, 18 Sep 2005, Vasile Surducan wrote:
>>
>>> On 9/18/05, Xiaofan Chen <xiaofanc@gmail.com> wrote:
>>>
>>>> Yes in certain application we need a lot of gain and dynamic range.
>>>
>>>
>>>
>>> Yes, then if we are poor and don't want to waste our money on
>>> expensive OA we split the necessary gain on the amplifier chain. Keep
>>> the current to voltage conversion in a convenient low gain (this will
>>> keep the fast transient response) and use two supplementary OA for
>>> increasing the overall gain. I'm affraid this is the way for a 60dB
>>> gain, right ?
>>> Fortunately low input current OA accept feedback values of up to 100M
>>> or more if are used corectly.
>>
>>
>>
>> Why not set up a cascode amplifier with the diode as the 'first' stage 
>> and see what happens ? With a switching transistor as the 'next' stage 
>> it should follow light input into the 10's of MHz at least.
>>
>> Peter


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