LA-22 Lab Amplifier

Oscilloscopes and spectrum analyzers are wonderful devices—with a bit of ingenuity, you can use them to make instant graphs of nearly anything, in the time or frequency domain.  They do have a few flaws, however.  For low-level measurements, their main problem is that they're noisy; your average spectrum analyzer's noise figure is about 30 dB, and the average scope isn't much better; its most sensitive scale is usually 1 mV/div, and there's a noticeable amount of noise on the baseline.  That means that a lot of stuff that we need to see gets buried in the instrument noise. The LA22 Low Noise Lab Amplifier makes it easy to do low-level measurements using ordinary lab equipment such as oscilloscopes, spectrum analyzers, and data acquisition bricks, whose noise levels are typically in the tens of nanovolts per root hertz. The LA22 has 1.1-nV/√Hz voltage noise, wide bandwidth, FET input, 100× (40 dB) gain, and good manners: in the time domain, 20-ns edges with low overshoot; and in the fre