A/D conversion device

An A/D conversion device that operates in at least two or more modes, which includes:

• a ΔΣ mode in which an analog input signal is processed by an A/D conversion process with a ΔΣ method;
• and a cyclic mode in which the analog input signal is processed by the A/D conversion process with a cyclic method, the A/D conversion device comprising:
• a first block that receives the analog input signal and processes the analog input signal by a first amplifier;
• a second block including a second amplifier that receives an output voltage of the first block;
• a quantization unit that receives one of outputs of the first block and the second block and quantizes the one of the outputs;
• and
• a control circuit that switches the at least two or more modes and controls a switching of a mode to perform a control corresponding to the mode, wherein:
• in the ΔΣ mode, the control circuit uses the first amplifier of the first block and the second amplifier of the second block to quantize the output of the second block by the quantization unit and to process the output by the A/D conversion process with the ΔΣ method;
• and
• in the cyclic mode, the control circuit uses the first amplifier of the first block without using the second amplifier of the second block to quantize the output of the first amplifier of the first block by the quantization unit and to process the output by the A/D conversion process with the cyclic method.

An A/D conversion device that operates in at least three or more modes, which includes:

• a ΔΣ mode in which an analog input signal is processed by an A/D conversion process with a ΔΣ method;
• a cyclic mode in which the analog input signal is processed by the A/D conversion process with a cyclic method;
• and a hybrid mode in which the analog input signal is processed by the A/D conversion process with the ΔΣ method and then a residual is processed by the A/D conversion process with a cyclic method, the A/D conversion device comprising:
• a first block that receives the analog input signal and processes the analog input signal by a first amplifier;
• a second block including a second amplifier that receives an output voltage of the first block;
• a quantization unit that receives one of outputs of the first block and the second block and quantizes the one of the outputs;
• and
• a control circuit that switches the at least three or more modes and controls a switching of a mode to perform a control corresponding to the mode, wherein:
• in the ΔΣ mode, the control circuit uses the first amplifier of the first block and the second amplifier of the second block to quantize the output of the second block by the quantization unit and to process the output by the A/D conversion process with the ΔΣ method;
• in the hybrid mode, the control circuit uses the first amplifier of the first block without using the second amplifier of the second block to quantize the output of the first amplifier of the first block by the quantization unit with the ΔΣ method and to process the output by the A/D conversion process, and then the control circuit uses the first amplifier to process the residual by the A/D conversion process with the cyclic method;
• and
• in the cyclic mode, the control circuit uses the first amplifier of the first block without using the second amplifier of the second block to quantize the output of the first amplifier of the first block by the quantization unit and to process the output by the A/D conversion process with the cyclic method.

An A/D conversion device that operates in at least two or more modes, which includes:

• a ΔΣ mode in which an analog input signal is processed by an A/D conversion process with a ΔΣ method;
• and a hybrid mode in which the analog input signal is processed by the A/D conversion process with the ΔΣ method and then a residual is processed by the A/D conversion process with a cyclic method, the A/D conversion device comprising:
• a block that receives the analog input signal and processes the analog input signal by an amplifier;
• a quantization unit that quantizes an output of the block;
• a control circuit that switches the at least two or more modes and controls a switching of a mode to perform a control corresponding to the mode;
• a first sampling capacitor for sampling the analog input signal;
• a first capacitor for sampling the analog input signal;
• a second sampling capacitor for sampling an output voltage of the block;
• a first capacitor switching circuit (20) that charges and discharges the first capacitor constituting a first D/A converter;
• and
• a second capacitor switching circuit that charges and discharges a second capacitor constituting a second D/A converter, wherein:
• in the ΔΣ mode, the control circuit
• performs a first ΔΣ operation of sampling the analog input signal in the first capacitor using the amplifier of the block,
• performs a second ΔΣ operation of charging or discharging the first capacitor of the first D/A converter in accordance with a digital output of the quantization unit, inputting an output voltage integrated by the amplifier into the quantization unit, and sampling the output voltage using the second sampling capacitor,
• performs a third ΔΣ operation of charging or discharging the second capacitor of the second D/A converter and the second sampling capacitor in accordance with the digital output of the quantization unit and inputting the output voltage integrated by the amplifier into the quantization unit, and
• repeating the second ΔΣ operation and the third ΔΣ operation to quantize using the quantization unit and to process by the A/D conversion process an output voltage integrated by the amplifier of the block with the ΔΣ method;
• and
• in the hybrid mode, the control circuit
• performs a fourth ΔΣ operation of sampling the analog input signal in the first sampling capacitor using the amplifier of the block,
• performs a fifth ΔΣ operation of charging or discharging the first capacitor of the first D/A converter and the first sampling capacitor in accordance with the digital output of the quantization unit, and inputting the output voltage integrated by the amplifier into the quantization unit, and
• repeating the fourth ΔΣ operation and the fifth ΔΣ operation to process the output voltage of the amplifier of the block by the A/D conversion process with the ΔΣ method and to process the residual by the A/D conversion process with the cyclic method.

An A/D conversion device that operates in at least two or more modes, which includes:

• a ΔΣ mode in which an analog input signal is processed by an A/D conversion process with a ΔΣ method;
• and a cyclic mode in which the analog input signal is processed by the A/D conversion process with a cyclic method, the A/D conversion device comprising:
• a block that receives the analog input signal and processes the analog input signal by an amplifier;
• a quantization unit that quantizes an output of the block;
• a control circuit that switches the at least two or more modes and controls a switching of a mode to perform a control corresponding to the mode;
• a first sampling capacitor for sampling the analog input signal;
• a first capacitor for sampling the analog input signal;
• a second sampling capacitor for sampling an output voltage of the block;
• a first capacitor switching circuit that charges and discharges the first capacitor constituting a first D/A converter;
• and
• a second capacitor switching circuit that charges and discharges a second capacitor constituting a second D/A converter, wherein:
• in the ΔΣ mode, the control circuit
• performs a first ΔΣ operation of sampling the analog input signal in the first capacitor using the amplifier of the block,
• performs a second ΔΣ operation of charging or discharging the first capacitor of the first D/A converter in accordance with a digital output of the quantization unit, inputting an output voltage integrated by the amplifier into the quantization unit, and sampling the output voltage using the second sampling capacitor,
• performs a third ΔΣ operation of charging or discharging the second capacitor of the second D/A converter and the second sampling capacitor in accordance with the digital output of the quantization unit and inputting the output voltage integrated by the amplifier into the quantization unit, and
• repeating the second ΔΣ operation and the third ΔΣ operation to quantize using the quantization unit and to process by the A/D conversion process an output voltage integrated by the amplifier of the block with the ΔΣ method;
• and
• in the cyclic mode, the control circuit quantizes using the quantization unit and process by the A/D conversion process with the cyclic method an output voltage integrated by the amplifier of the block.