Delta-sigma modulation type A/D converter
AssigneesDenso Corporation, Toyota Jidosha Kabushiki Kaisha, MIRISE Technologies Corporation
InventorsKofi Afolabi Anthony Makinwa, Zhong Tang
Life of this patent
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Abstract
A delta-sigma modulation type A/D converter includes: a capacitively coupled amplifier having a sampling capacitor, a feedback capacitor, and an amplifier; a correlated double sampling type first integrator as a first-stage integrator, which is connected to the capacitively coupled amplifier without a switch; a second integrator arranged after the first integrator; a quantizer arranged after the second integrator and quantizing an output of the second integrator; and an D/A converter that D/A-converts an output of the quantizer and feeds back to any one of the capacitively coupled amplifier, the first integrator, and the second integrator.
Claims10
A delta-sigma modulation type A/D converter that digitally converts an analog input signal, the A/D converter comprising:
- a capacitively coupled amplifier having a sampling capacitor, a feedback capacitor, and an amplifier, and amplifying the analog input signal;
- a correlated double sampling type first integrator that is disposed after the capacitively coupled amplifier, as a first-stage integrator, wherein an output of the capacitively coupled amplifier and an input of the sampling capacitor of the first integrator are directly connected to each other without a switch;
- a second integrator arranged after the first integrator;
- a quantizer arranged after the second integrator and quantizing an output of the second integrator;
- and
- an D/A converter that D/A-converts an output of the quantizer and feeds back to any one of the capacitively coupled amplifier, the first integrator, and the second integrator.
Dependencies are inferred from the claim text.