High beta output stage for high speed operational amplifier

摘要

The present invention provides an high beta, high speed operational amplifier output stage (100). The advantages of the operational amplifier output stage over conventional methods disclosed is up to beta2 rather than a single beta. The present invention achieves this using an pre-driver sub-stage (122) having a plurality of translinear loops so that there is no net signal loss to the final sub-stage (123). The output of the disclosed operational amplifier output stage takes the form:When used with a localized feedback circuitry, speed performance is increased and bandwidth is extended.