Application Note AN-1: Photoreceiver Testing System

We've published our first full-scale application note: AN-1: Photoreceiver Testing System.  Based on our LP870 Nanosecond Light Source and LA22 Lab Amplifier, the system gives an easy and economical way to test photoreceivers as fast as 5 ns.  In the time domain, it measures rise and fall times with excellent accuracy.  In the frequency domain, it measures the noise floor (down to below 1 nV/√Hz), both dark and light, and gives a neat hack for measuring the transimpedance vs. frequency to very high accuracy.
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