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US 8,896,757 B2Granted
Delta-sigma A/D converter, limiter circuit and television receiver
AssigneeSony Corporation
InventorTomohiro Matsumoto
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Abstract
There is provided a delta-sigma A/D converter including a first integrator, a second integrator located on an output side of the first integrator, a quantizer located on an output side of the second integrator, and a first current D/A converter receiving an output of the quantizer and providing a negative feedback signal to an input side of the quantizer.
Claims5
A delta-sigma A/D converter comprising:
- a first integrator;
- a second integrator located on an output side of the first integrator;
- a quantizer located on an output side of the second integrator;
- a first current D/A converter receiving an output of the quantizer and providing a negative feedback signal to an input side of the quantizer;
- and
- a second current D/A converter receiving the output of the quantizer and providing a negative feedback signal to an input side of the first integrator,
- wherein a differential analog signal is inputted to the first integrator, the second integrator and the quantizer, and
- wherein the first current D/A converter includes a plurality of current source units each including a first current source connected between an in-phase signal line for the differential analog signal and a ground, and a second current source connected between a reverse phase signal line for the differential analog signal and the ground.
5 more elements
A delta-sigma A/D converter comprising:
- a first integrator;
- a second integrator located on an output side of the first integrator;
- a quantizer located on an output side of the second integrator;
- a first current D/A converter receiving an output of the quantizer and providing a negative feedback signal to an input side of the quantizer;
- and
- a limiter circuit, wherein the limiter circuit includes
- a reference voltage source outputting a reference voltage equal to an allowed input voltage of the delta-sigma A/D converter;
- a comparator comparing the reference voltage of the reference voltage source with a voltage of an input signal to convert a logical state when the voltage of the input signal exceeds the reference voltage;
- and
- a switch circuit providing, upon the comparator determining that the voltage of the input signal exceeds the reference voltage, a signal at a level equal to a level of the reference voltage to an input terminal of the delta-sigma A/D converter.
7 more elements
Dependencies are inferred from the claim text.