Patent ID: 7358777

Claim:
A current feedback amplifier circuit, comprising: a first input buffer ( 406 a ) that provides a first non-inverting input (IN+A) of the amplifier circuit, provides a first inverting input (IN−A) of the amplifier circuit, and produces a first plurality of currents; a second input buffer ( 406 b ) that provides a second non-inverting input (IN+B) of the amplifier circuit, provides a second inverting input (IN−B) of the amplifier circuit, and produces a second plurality of currents; first and second high impedance nodes ( 414 a and 414 b ); a plurality of current mirrors to provide currents, proportional to sums of specific currents of the first and second plurality of currents, to the high impedance nodes; a first output buffer ( 408 a ) having an input connected to the first high impedance node ( 414 a ), and having an output that provides a first output (OUTA) of the amplifier circuit; and a second output buffer ( 408 b ) having an input connected to the second high impedance node ( 414 b ), and having an output that provides a second output (OUTB) of the amplifier circuit; wherein the first plurality of currents are proportional to a difference between an input voltage provided to the first non-inverting input (IN+A) of the amplifier circuit and a fraction of its associated output voltage at the first output (OUTA); and wherein the second plurality of currents are proportional to a difference between an input voltage provided to the second non-inverting input (IN+B) of the amplifier circuit and a fraction of its associated output voltage at the second output (OUTB).