A fast precision operational amplifier featuring two separate control loops
Derek F. Bowers · 2014
An operational amplifier is described which uses separate loops to control the output voltage and the error voltage between its inputs. To a large extent this architecture combines the high-speed characteristics of “current feedback” amplifiers with the low input referred errors of precision architectures. The technique has been applied to produce an amplifier with precision characteristics comparable to OP-07 type amplifiers but with over 100 times the bandwidth and slew-rate. Additionally, the power consumption has been reduced by a factor of three.