Delta sigma modulator
AssigneeToyota Jidosha Kabushiki Kaisha
InventorHikaru Watanabe
Life of this patent
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Abstract
A ΔΣ modulator converts an input analog quantity into a digital value quantized with a predetermined number of bits and outputs the digital value. The ΔΣ modulator includes an integrator that includes a capacitor and integrates a difference between the input analog quantity and an analog quantity acquired from D/A conversion of the output digital value by a D/A converter; a quantizer that quantizes an analog quantity acquired from integration by the integrator; and a digital integrator that carries out an integration operation on data acquired from quantization by the quantizer.
Claims20
A ΔΣ modulator converting an input analog quantity into a digital value quantized with a predetermined number of bits and outputting the digital value, the ΔΣ modulator comprising:
- an integrator that includes an integration capacitor and integrates a difference between the input analog quantity and an analog quantity acquired from D/A conversion of the output digital value by a D/A converter, an end of the integration capacitor from which charge that is input from the integrator's input terminal is stored being used as the integrator's output terminal;
- a quantizer that quantizes an analog quantity acquired from integration by the integrator;
- and
- a digital integrator that carries out an integration operation on data acquired from quantization by the quantizer.
Dependencies are inferred from the claim text.