Switched-capacitor circuit and pipelined analog-to-digital converter
AssigneeHimax Technologies Limited
InventorsJin-Fu Lin, Chia-Hsuan Huang
Life of this patent
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Abstract
A switched-capacitor circuit which comprises a first sampling capacitor, a second sampling capacitor, an op-amp, a third capacitor, and a fourth capacitor is provided. The first sampling capacitor is disposed to sample an input signal in a sampling phase. The second sampling capacitor is disposed to sample the input signal in the sampling phase. Wherein, in a first amplify phase, the third capacitor stores an offset voltage of the op-amp, the fourth capacitor stores the electric charges which are flowed from the first sampling capacitor and the second sampling capacitor, and in a second amplify phase, the fourth capacitor gives the stored electric charges back to the first sampling capacitor and the second sampling capacitor.
Claims18
A pipelined analog-to-digital converter (ADC), comprising:
- a plurality of stages, each having:
- a multiplying digital-to-analog converter (MDAC), comprising:
- a first sampling capacitor disposed to sample an input signal in a sampling phase;
- a second sampling capacitor disposed to sample the input signal in the sampling phase;
- an operational amplifier (op-amp);
- a third capacitor;
- and
- a fourth capacitor;
- wherein, in a first amplify phase, the third capacitor stores an offset voltage of the op-amp, the fourth capacitor stores the electric charges which are flowed from the first sampling capacitor and the second sampling capacitor, and in a second amplify phase, the fourth capacitor gives the stored electric charges back to the first sampling capacitor and the second sampling capacitor.
A switched-capacitor circuit, comprising:
- a first sampling capacitor disposed to sample an input signal in a sampling phase;
- a second sampling capacitor disposed to sample the input signal in the sampling phase;
- an operational amplifier (op-amp);
- a third capacitor;
- and
- a fourth capacitor;
- wherein, in a first amplify phase, the third capacitor stores an offset voltage of the op-amp, the fourth capacitor stores the electric charges which are flowed from the first sampling capacitor and the second sampling capacitor, and in a second amplify phase, the fourth capacitor gives the stored electric charges back to the first sampling capacitor and the second sampling capacitor.
Dependencies are inferred from the claim text.