Flat spot suppression in sigma delta converters
AssigneeCypress Semiconductor Corporation
InventorsPeng CHEN, Gaurav PANCHANAN
Life of this patent
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Abstract
A sigma delta converter structure comprises a sampling stage that comprises a sampling capacitor. The sigma delta converter structure further comprises a modulation stage that comprises a modulation capacitor in series with the sampling capacitor, a reference capacitor, and a unit gain buffer having a non-inverting input terminal, an inverting input terminal and an output terminal. The non-inverting input terminal can be connectable to the reference capacitor and the modulation capacitor, and the output terminal can be connected to the inverting input terminal.
Claims20
A sigma delta converter structure, comprising:
- a sampling stage comprising a sampling capacitor;
- and
- a modulation stage comprising:
- a modulation capacitor in series with the sampling capacitor,
- a reference capacitor, and
- a unit gain buffer having a non-inverting input terminal, an inverting input terminal and an output terminal, wherein the non-inverting input terminal is connectable to the reference capacitor and the modulation capacitor, and the output terminal is connected to the inverting input terminal.
A flat spot suppression structure for a sigma delta converter system, the flat spot suppression structure comprising:
- a reference capacitor;
- and
- a unit gain buffer having a non-inverting input terminal, an inverting input terminal and an output terminal, wherein the non-inverting input terminal is connectable to the reference capacitor through a third switching device, the inverting input terminal is in series with a fourth switching device and a fifth switching device, the output terminal is connected to the inverting input terminal and connectable to a node between the third switching device and the reference capacitor through a sixth switching device, and the reference capacitor is connected to a node between the fourth switching device and the fifth switching device.
Dependencies are inferred from the claim text.