There are some JFET-input op-amps that have been released since Doug wrote his book that are worth considering:
The LME49880 is a dual op-amp with the usual JFET-input traits of negligible bias currents and low current noise. Voltage noise isn't too shabby at 7 nv/sqrt(Hz). The only drawback is a relatively high input offset voltage of ±5 mV (typ), ±10 mV (max). As one would expect for an LME49xxx part, it has exceptionally low distortion (0.00003 % into 600 ohms; yes, that's four zeros!) and isn't too expensive.
The ADA4627-1 (unity-gain stable) and ADA4637-1 (decompensated), as the part numbers suggest, are decent alternatives to the OPA627/637 with very similar performance but at half the price (still very expensive!).
NASA's Orion Flight Software Production Systems Manager Darrel G. Raines joins Planet Analog Editor Steve Taranovich and Embedded.com Editor Max Maxfield to talk about embedded flight software used in Orion Spacecraft, part of NASA's Mars mission. Live radio show and live chat. Get your questions ready.
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