AD converter and AD conversion method
AssigneeKabushiki Kaisha Toshiba
InventorsHirotomo Ishii, Masanori Furuta, Nobuo Kano
Life of this patent
Estimating the term…
Abstract
An A/D converter includes a plurality of AD converting sections that sequentially operate at predetermined intervals. The AD converting section has an ADC that converts an analog signal into a digital signal and outputs the digital signal, a memory that stores, as a specific polarity value, the polarity of a signal obtained by the ADC digitizing an analog signal at a reference voltage, an analog polarity converting circuit that inverts the polarity of the analog signal based on the specific polarity value and a set polarity value, which is previously set, and a digital polarity converting circuit that inverts the polarity of the digital signal based on the specific polarity value and the set polarity value.
Claims14
An AD converter comprising a plurality of channels of AD converting sections that sequentially operate at predetermined time intervals, wherein each of the AD converting sections comprises:
- a data converting section that converts an analog signal into a digital signal and outputs the digital signal;
- an analog polarity converting circuit that inverts or does not invert a polarity of an analog input signal before supplying the analog input signal to the data converting section as the analog signal;
- a digital polarity converting circuit that inverts or does not invert a polarity of the digital signal from the data converting section before outputting the digital signal;
- and
- a controlling section that controls inversion processing by the analog polarity converting circuit and the digital polarity converting circuit based on a specific polarity value that indicates the polarity of the digital signal obtained from the data converting section in a case where an analog signal at a reference voltage is supplied to the data converting section.
An AD conversion method for an AD converter comprising a plurality of channels of AD converting sections that sequentially operate at predetermined time intervals, the method comprising, in each of the plurality of channels of AD converting sections:
- inverting or not inverting a polarity of an analog input signal based on information on an element characteristic of a data converting section, which converts an analog signal into a digital signal and outputs the digital signal, before outputting the analog input signal,
- converting the analog input single output with the polarity inverted or not inverted into a digital signal, and
- inverting or not inverting a polarity of the digital signal resulting from the conversion based on the information on the element characteristic of the data converting section before outputting the digital signal,
- wherein a specific polarity value that indicates the polarity of the digital signal obtained from the data converting section is used in a case where an analog signal at a reference voltage is supplied to the data converting section as the information on the element characteristic of the data converting section, and a polarity inversion operation for the analog input signal and a polarity inversion operation for the digital signal are controlled based on the specific polarity value and a set polarity value previously set.
Dependencies are inferred from the claim text.