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From: "John Jardine"
Subject: Re: photodetector circuit, high speed with good ambient light rejection
Date: Thu, 28 Nov 2002 23:06:53 -0000
NNTP-Posting-Date: 28 Nov 2002 22:55:00 GMT
X-Newsreader: Microsoft Outlook Express 5.00.2615.200
Raymond Rogers wrote in message
> through the diode is read off of the collector. It's called cascode.
> You might look at:
> This paper seems to cover most bases.
> The cascode circuit is on page 3.
> Of course I come from a time when Op-amps were not as good; but it never
> hurts to reduce the source impedance seen by the diode, since that is a
> limiting factor on bandwidth.
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