(IEEE, 2018) López Martín, Antonio; Garde Luque, María Pilar; Algueta-Miguel, Jose M.; Cruz Blas, Carlos Aristóteles de la; Carvajal, Ramón G.; Ramírez-Angulo, Jaime; Institute of Smart Cities - ISC
An enhanced single-stage folded cascode operational
transconductance amplifier able to drive large capacitive loads is
presented. Circuits that adaptively bias the input differential pair
and the current folding stage are employed, which provide class
AB operation with dynamic current boosting and increased gainbandwidth (GBW) product. Measurement results of a test chip
prototype fabricated in a 0.5-µm CMOS process show an increase
in slew rate and GBW by a factor of 30 and 15, respectively,
versus the class A version using the same supply voltage and bias
currents. Overhead in other performance metrics is small.
