Sensor device
AssigneeMurata Manufacturing Co., Ltd.
InventorsYasuhide TAKASE, Yasuyuki MATSUYA
Life of this patent
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Abstract
A sensor device includes an A/D converter including an adder that computes a difference between an analog input signal and a predicted value, the adder includes a capacitive adder defined by a series circuit including a capacitive charge output device and a capacitor. A capacitive component in the charge output device defines a portion of the capacitance of the capacitive adder. A digital prediction filter generates the predicted value based on an output from a quantizer. The capacitive adder computes the difference between the analog input signal from the charge output device and the predicted value. The quantizer quantizes and encodes the difference. The A/D converter performs a Δ modulation on the analog input signal which is converted into a digital signal.
Claims16
A sensor device comprising:
- an A/D converter including:
- an adder that computes a difference between an analog input signal and a predicted value;
- a quantizer that quantizes the difference which is output from the adder, and that converts, for output, the analog input signal into a digital signal;
- and
- a digital prediction filter that generates the predicted value from the digital signal which is output from the quantizer, and that outputs the predicted value to the adder;
- wherein
- the adder includes a capacitive adder defined by a first series circuit including a capacitive charge output device and a first capacitor;
- and
- a connecting point between the capacitive charge output device and the first capacitor is connected to an input of the quantizer.
Dependencies are inferred from the claim text.