Operational amplifier circuit having digitally controllable output stage

摘要

An operational amplifier circuit includes a control stage and an output stage. The control stage includes an analog control stage for generating a first control signal according to an input signal and a digital control stage for generating a second control signal according to the input signal. The output stage includes a sourcing circuitry coupled to the analog control stage and a load for sourcing a first current to the load according to the first control signal, and a sinking circuitry coupled to the digital control stage and the load for sinking a second current from the load according to the second control signal.