Systems and methods for mismatch cancellation in switched capacitor circuits
AssigneeTexas Instruments Incorporated
InventorsJinseok Koh, Alexander Reyes
Life of this patent
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Abstract
Various circuits, systems and methods are disclosed for providing double-sampling sigma-delta modulator circuits. For example, circuits are disclosed that include an amplifier with an integrating capacitor, a switched capacitor conversion element that includes a single capacitor bank, and a control element that provides phase signaling that identifies at least two phases. In operation, charge present on the single capacitor bank is transferred to the integrating capacitor and the single capacitor bank is charged during one phase. During the other phase, charge present on the single capacitor bank is transferred to the integrating capacitor, and the single capacitor bank is discharged.
Claims20
A double-sampling sigma-delta modulator circuit, the circuit comprising:
- an amplifier including an integrating capacitor;
- a switched capacitor conversion element including a single capacitor bank;
- and
- a control element, wherein the control element provides phase signaling that identifies at least a first phase and a second phase;
- wherein during the first phase charge present on the single capacitor bank is transferred to the integrating capacitor, and the single capacitor bank is charged;
- and
- wherein during the second phase charge present on the single capacitor bank is transferred to the integrating capacitor, and the single capacitor bank is discharged.
A scalable, double-sampling sigma-delta modulator circuit, the circuit comprising:
- an amplifier;
- and
- a double-sampled digital to analog converter, wherein the double-sampled digital to analog converter is coupled to the amplifier, and wherein the double-sampled digital to analog converter is free of alternating gain effect.
A method for implementing a double-sampled sigma-delta converter, the method comprising:
- providing an amplifier with an integrating capacitor;
- providing a double-sampled digital to analog converter including only one switched capacitor structure with a single capacitor bank;
- providing a control element, wherein the control element provides phase signaling that identifies at least a first phase and a second phase;
- electrically coupling the control element to the double-sampled digital to analog converter;
- and
- electrically coupling the double-sampled digital to analog converter to the amplifier.
Dependencies are inferred from the claim text.