TOP LOW-NOISE AMPLIFIER SECRETS

It really is LM108 and LM112 (internally compensated) and there is admittedly no trick there. It's 1nA input bias which can be relatively secure with temperature as in most bipolar opamps because β basically enhances with temperature. Later on iterations like LT1008/LT1012 or OP97 pushed it down toA PIN diode only functions like a rectifier at ver