Circuit for automatically controlling the gain-bandwidth product of operational amplifiers.

摘要

A circuit for automatically controlling the gain-bandwidth product of operational amplifiers (M1-Mn), wherein gain-bandwidth product (G*B) of one of the amplifiers placed on the same chip as the amplifiers to be controlled is measured and the resulting signal is used to control through a bias circuit (CP) the gain-bandwidth products of all the amplifiers, the value of these products being presettable through the frequency of a control signal sent to the circuit input (1). The reference amplifier is highly compensated and placed in the configuration of voltage follower.