Input distortion correction current-feedback amplifier system
AssigneeAnalog Devices, Inc.
InventorsStefano D'Aquino, Kimo Y. F. Tam
Life of this patent
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Abstract
An input distortion correction current-feedback amplifier system includes a current mirror; an input stage connected to the input of the current mirror; an output stage connected to the output of the current mirror; a feedback circuit connected from the output stage to the input stage; a compensation impedance connected to the output of the current mirror; and a distortion correction circuit for sensing the distortion voltage across the input stage and providing to the current mirror a current representative of the distortion voltage for delivering to the compensation impedance a correction current to develop a correction voltage at the input of the output stage to nullify the effect of the distortion voltage.
Claims15
An input distortion correction current-feedback amplifier system comprising:
- a current mirror;
- an input stage connected to the input of said current mirror;
- an output stage connected to the output of said current mirror;
- a feedback circuit connected from the output stage to the input stage;
- a compensation impedance connected to the output of said current mirror;
- and
- a distortion correction circuit for sensing the distortion voltage across said input stage and providing to said current mirror a current representative of said distortion voltage for delivering to said compensation impedance a correction current to develop a correction voltage at the input of said output stage to nullify the effect of said distortion voltage.
An input distortion correction current-feedback amplifier system comprising:
- a current mirror;
- an input stage connected to the input of said current mirror;
- an output stage connected to the output of said current mirror;
- a feedback circuit connected from the output stage to the input stage;
- a compensation impedance connected to the output of said current mirror;
- and
- a distortion correction circuit for sensing the distortion voltage across said input stage and providing to said current mirror a current representative of said distortion voltage for delivering to said compensation impedance a correction current to develop a correction voltage at the input of said output stage to nullify the effect of said distortion voltage, wherein the distortion voltage induces a distortion current in said feedback circuit and said correction current is equal and opposite to said distortion current.
An input distortion correction current-feedback amplifier system comprising:
- a current mirror;
- an input stage connected to the input of said current mirror;
- an output stage connected to the output of said current mirror;
- a feedback circuit connected from the output stage to the input stage;
- a compensation impedance connected to the output of said current mirror;
- and
- a distortion correction circuit for sensing the distortion voltage across said input stage and providing to said current mirror a current representative of said distortion voltage for delivering to said compensation impedance a correction current to develop a correction voltage at the input of said output stage to nullify the effect of said distortion voltage, said distortion correction circuit including a pair of buffer amplifiers with their low-impedance outputs connected to a correction resistance and at least one of their high impedance outputs connected to said current mirror.
Dependencies are inferred from the claim text.