Patent ID: 6492871
Filing Date: 2002-12-10
Classification: H03F

Abstract:
A current feedback operational amplifier having a first and a second input end, comprising:a current conveyor including a first amplifier and at least one input pair of current switches, characterized in that said first and second input ends function as inputs of said first amplifier, the output of said first amplifier is electrically connected to gate terminals of said at least one input pair of current switches, and a source terminal of one transistor of said at least one input pair of current switches is connected to said first input end; and an output stage connected to said current conveyor for enhancing the output driving capability; whereby a negative feedback loop is established to enhance gains and to reduce input impedance, wherein said current conveyor further includes at least one current mirror which is electrically connected to said at least one input pair of current switches, and the phase of said at least one input pair of current switches is opposite to that of said at least one current mirror.