Analog/digital converter and method for controlling the same
First Claim
1. A method for controlling an analog/digital converter circuitry, comprising:
- generating a digital signal by accumulating a predetermined increment at a predetermined time interval in accordance with a value of a first analog signal input to the analog/digital converter;
converting the digital signal to a second analog signal;
subtracting the second analog signal from the first analog signal and generating a detection signal in accordance with a subtraction result;
selecting one of accumulation modes in accordance with the detection signal; and
accumulating at the time interval and in the increment in accordance with the selected accumulation mode.
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Abstract
A method for controlling an analog/digital converter circuitry includes generating a digital signal by accumulating a predetermined increment at a predetermined time interval in accordance with a value of a first analog signal input to the analog/digital converter. The digital signal is converted to a second analog signal, the second analog signal is subtracted from the first analog signal, and a detection signal is generated in accordance with a subtraction result. An accumulation mode is selected from accumulation modes in accordance with the detection signal and accumulation is performed at the time interval and in the increment in accordance with the selected accumulation mode.
8 Citations
16 Claims
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1. A method for controlling an analog/digital converter circuitry, comprising:
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generating a digital signal by accumulating a predetermined increment at a predetermined time interval in accordance with a value of a first analog signal input to the analog/digital converter;
converting the digital signal to a second analog signal;
subtracting the second analog signal from the first analog signal and generating a detection signal in accordance with a subtraction result;
selecting one of accumulation modes in accordance with the detection signal; and
accumulating at the time interval and in the increment in accordance with the selected accumulation mode. - View Dependent Claims (2, 3, 4)
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5. An analog/digital converter comprising:
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error detecting circuits having a first input terminal and a second input terminal, the first input terminal supplied with a first analog signal and the second input terminal supplied with a second analog signal;
detecting circuits supplied with an output signal of the error detecting circuits;
controlling circuits, supplied with an output signal of the detecting circuits, selecting one of accumulation modes determined in accordance with the output signal of the detecting circuits and performing an accumulation at a time interval and in an increment in accordance with the selected accumulation mode; and
a digital/analog converter, supplied with an output signal of the controlling circuits and converting the output signal of the controlling circuits to the second analog signal. - View Dependent Claims (6, 7, 8, 9, 10)
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11. An analog/digital converter comprising:
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error detecting circuits, having a first input terminal and a second input terminal, the first input terminal supplied with a first analog signal, the second input terminal supplied with a second analog signal, the first analog signal being an input signal of the analog/digital converter, and outputting a subtraction signal as a result of subtracting the second analog signal from the first analog signal;
detecting circuits, supplied with the subtraction signal, and outputting a detection signal having a polarity selected from the group consisting of positive and negative in accordance with the subtraction signal;
controlling circuits, supplied with the detection signal, having accumulation modes, performing accumulation at a time interval and in an increment, outputting an accumulation signal as a result of the accumulation, the time interval and the increment varying depending on the accumulation modes, one of the accumulation modes selected in accordance with change of the polarity of the detection signal and count of continued signals of same polarity; and
a digital/analog converter, converting the accumulation signal to the second analog signal. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification