Apparatus, method and system for cancelling an input-referred offset in a pipeline adc
AssigneeLSI Corporation
InventorKalyan Ghatak
Life of this patent
Estimating the term…
Abstract
An apparatus, method and system for offset compensation in a pipeline analog-to-digital converter. A group of capacitors includes one or more sampling capacitors and one or more feedback capacitors, wherein an input to the pipeline analog-to-digital converter circuit is connected to group of capacitors. An amplifier includes a non-inverting input terminal connected to a ground and an inverting input connected to the group of capacitors. The sampling and feedback capacitors are both partitioned in the same ratio to form partitioned capacitors such that a smaller of the partitioned capacitors is employed for offset compensation with respect to the pipeline analog-to-digital converter.
Claims17
An apparatus for offset compensation in a pipeline analog-to-digital converter, said apparatus comprising:
- a plurality of capacitors including at least one sampling capacitor and said at least one feedback capacitor, wherein an input to said pipeline analog-to-digital converter circuit is connected to said plurality of capacitors;
- and
- an amplifier having a non-inverting input terminal connected to a ground and an inverting input connected to said plurality of capacitors, wherein said at least one sampling capacitor and said at least one feedback capacitor are both partitioned in a same ratio to form partitioned capacitors such that a smaller of said partitioned capacitors is employed for offset compensation with respect to said pipeline analog-to-digital converter.
A method for offset compensation in a pipeline analog-to-digital converter, said method comprising:
- configuring a plurality of capacitors to include at least one sampling capacitor and said at least one feedback capacitor;
- connecting an input to said pipeline analog-to-digital converter circuit to said plurality of capacitors;
- providing an amplifier having a non-inverting input terminal connected to a ground and an inverting input connected to said plurality of capacitors;
- and
- partitioning said at least one sampling capacitor and said at least one feedback capacitor in a same ratio to form partitioned capacitors such that a smaller of said partitioned capacitors is employed for offset compensation with respect to said pipeline analog-to-digital converter.
A system for offset compensation in a pipeline analog-to-digital converter, said system comprising:
- a pipeline analog-to-digital converter;
- a plurality of capacitors including at least one sampling capacitor and said at least one feedback capacitor, wherein an input to said pipeline analog-to-digital converter circuit is connected to said plurality of capacitors and is responsive to an input signal;
- and
- an amplifier having a non-inverting input terminal connected to a ground and an inverting input connected to said plurality of capacitors, wherein said at least one sampling capacitor and said at least one feedback capacitor are both partitioned in a same ratio to form partitioned capacitors such that a smaller of said partitioned capacitors is employed for offset compensation with respect to said pipeline analog-to-digital converter.
Dependencies are inferred from the claim text.