Analog-to-digital converter having a switched capacitor circuit
AssigneeKabushiki Kaisha Toshiba
InventorYusuke WADA
Life of this patent
Estimating the term…
Abstract
An analog-to-digital converter includes a switched capacitor circuit, an analog-to-digital conversion circuit, and a constant current circuit. The switched capacitor circuit includes first and second input terminals for a differential input, and is configured to sample an analog voltage of the differential input. The analog-to-digital conversion circuit is connected to output terminals of the switched capacitor circuit, and configured to convert the sampled analog voltage into a digital signal and output the digital signal. The constant current circuit is connected to at least one of the first and second input terminals.
Claims13
An analog-to-digital converter comprising:
- a switched capacitor circuit that includes first and second input terminals for a differential input, and is configured to sample an analog voltage of the differential input;
- an analog-to-digital conversion circuit connected to output terminals of the switched capacitor circuit, and configured to convert the sampled analog voltage into a digital signal and output the digital signal;
- and
- a constant current circuit that is connected to the first and second input terminals and configured to supply a first constant current having a value equal to or substantially equal to an average value of a current flowing to an internal resistor of the switched capacitor circuit during an operation of the switched capacitor circuit, to one of the first and second input terminals having a higher potential, and draw a second constant current having a value equal to or substantially equal to the average value, from the other of the first and second input terminals having a lower potential.
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7-9. (canceled)
11-18. (canceled)
An analog-to-digital converter comprising:
- a switched capacitor circuit that includes first and second input terminals for a differential input, and is configured to sample an analog voltage of the differential input;
- an analog-to-digital conversion circuit connected to output terminals of the switched capacitor circuit, and configured to convert the sampled analog voltage into a digital signal and output the digital signal;
- and
- a constant current circuit that is connected to one of the first and second input terminals having a lower potential and configured to draw a current of a value equal to or substantially equal to twice an average value of a current flowing to an internal resistor of the switched capacitor circuit during an operation of the switched capacitor circuit, from said one of the first and second input terminals having the lower potential.
An analog-to-digital converter comprising:
- a switched capacitor circuit that includes first and second input terminals for a differential input, and is configured to sample an analog voltage of the differential input;
- an analog-to-digital conversion circuit connected to output terminals of the switched capacitor circuit, and configured to convert the sampled analog voltage into a digital signal and output the digital signal;
- and
- a constant current circuit that is connected to at least one of the first and second input terminals and includes a variable resistor, a resistance of the variable resistor being adjusted based on the digital signal output from the analog-to-digital conversion circuit to adjust a value of a constant current output by the constant current circuit.
Dependencies are inferred from the claim text.