Patent ID: 6353361
Filing Date: 2002-03-05
Classification: H03F

Abstract:
An operational amplifier comprising:an input stage comprising a first plurality of P-channel and N-channel metal-oxide semiconductor field-effect transistors electrically connected in a telescopic operational amplifier configuration; a positive input electrically connected to the input stage; a negative input electrically connected to the input stage; a first amplifier electrically connected to the input stage, wherein the first amplifier is configured to be electrically connected to P-channel metal-oxide semiconductor field-effect transistors and comprises: a first amplifier stage comprising a second plurality of P-channel and N-channel metal-oxide semiconductor field-effect transistors electrically connected in a first fully-differential operational amplifier configuration; a positive input electrically connected to the first amplifier stage; a negative input electrically connected to the first amplifier stage; a positive output electrically connected to the first amplifier stage; a negative output electrically connected to the first amplifier stage; and a first bias input electrically connected to the first amplifier stage; a second amplifier electrically connected to the input stage, wherein the second amplifier is configured to be electrically connected to N-channel metal-oxide semiconductor field-effect transistors and comprises: a second amplifier stage comprising a third plurality of P-channel and N-channel metal-oxide semiconductor field-effect transistors electrically connected in a second fully-differential operational amplifier configuration; a positive input electrically connected to the second amplifier stage; a negative input electrically connected to the second amplifier stage; a positive output electrically connected to the second amplifier stage; a negative output electrically connected to the second amplifier stage; and a second bias input electrically connected to the second amplifier stage; a first series circuit comprising a first coupling resistor and a first coupling capacitor electrically connected to the input stage; a second series circuit comprising a second coupling resistor and a second coupling capacitor electrically connected to the input stage; an output stage electrically connected to the first series circuit and to the second series circuit comprising a fourth plurality of P-channel and N-channel metal-oxide semiconductor field-effect transistors electrically connected in a third fully-differential operational amplifier configuration; a positive output electrically connected to the output stage, wherein a first load capacitor is electrically connected to the positive output; a negative output electrically connected to the output stage, wherein a second load capacitor is electrically connected to the negative output; and a plurality of bias inputs electrically connected to the input stage, the output stage, the first amplifier, and the second amplifier.