| 摘要 |
A precision, low power operational amplifier employs a transconductance amplifier architecture to provide wide operational bandwidth at any closed looped gain, and maintain DC precision. A single ended output node/port, to which current paths of first and second current mirrors of the transconductance amplifier are coupled serves as a "non-inverting' terminal. The first and second current mirrors include additional current mirror stages whose outputs are coupled to respective third and fourth auxiliary current mirrors. The outputs of the third and fourth current mirrors are coupled to an "inverting' terminal. An output amplifier stage has its non-inverting input coupled to ground and its inverting input coupled to a feedback port. A gain-defining feedback resistor is coupled between the output and the feedback port of the output amplifier stage. The functionality of the operational amplifier circuit is defined by selectively connecting the feedback port of the output amplifier stage to one of the non-inverting and inverting terminals, with the other of these two terminals being unconnected or open.
|
