Re: One giga ohms resistor

On 19 Nov 2005 01:15:21 -0800, "mowhoong@xxxxxxxxxxx"
<mowhoong@xxxxxxxxxxx> wrote:

>A customer next to me asking the shop assistant whether he sells one
>giga ohm resistor.
>I am wondering what is the pupose to use such a high resistance
>component, this is almost
>a good insulator for any material like plastic. Dear member, does any
>person know the reason for buying a 1 giga ohm resistor?
>Best Wishes and merry x'mas
>regards

They are used as feedback resistors in photodiode transimpedance
amplifiers (current to voltage converters.) One nanoamp into an op
amp with a 1 G feedback resistor comes out as one volt.

I Gigohm's are even available in chip form and in 1% tolerance. I
have used as high as 10 Gigohm 1% resistors in photodiode test
equipment. Victoreen, now owned by Ohmite, is one manufacturer.
Digi-Key carries them through 5 gig 1%.

Steve Noll | The Used Equipment Dealer Directory:
| http://www.big-list.com
| Peltier Information Directory:
| http://www.peltier-info.com

.

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