Digital-analog converter and digital-analog conversion device
AssigneeAsahi Kasei Microdevices Corporation
InventorsTatsuya CHUBACHI, Junya NAKANISHI
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Abstract
The DA converter according to the present invention includes: first and second analog segment units a plurality of capacitors of sampling capacitor groups charged according to signal levels of digital signals input in a sampling phase; and a calculation unit that outputs an analog signal according to a charged voltage of each capacitor of the sampling capacitor group of the first or second analog segment unit in an integral phase, wherein, when one analog segment unit of the first and second analog segment units is in the sampling phase, the other analog segment unit is in the integral phase.
Claims8
A digital-analog converter comprising:
- a first analog segment unit including a first sampling switch group and a first sampling capacitor group, a plurality of capacitors of the first sampling capacitor group charged according to a signal level of a first digital signal in a sampling phase;
- a second analog segment unit including a second sampling switch group and a second sampling capacitor group, a plurality of capacitors of the second sampling capacitor group charged according to a signal level of a second digital signal in the sampling phase;
- and
- a calculation unit including an operational amplifier and an integration capacitor, the calculation unit outputting an analog signal according to a charged voltage of each capacitor of the first sampling capacitor group or a charged voltage of each capacitor of the second sampling capacitor group in an integral phase,
- wherein, when one analog segment unit of the first and second analog segment units is in the sampling phase, the other analog segment unit is in the integral phase.
A digital-analog converter comprising:
- three or more analog segment units each including a sampling switch group and a sampling capacitor group, the three or more analog segment units connected to an input terminal inputting a digital signal and a reference voltage in a sampling phase, a plurality of capacitors of the sampling capacitor group charged according to a signal level of the input digital signal;
- and
- a calculation unit including an operational amplifier and an integration capacitor, in an integral phase, the calculation unit connected to one analog segment unit of the three or more analog segment units, and the calculation unit outputting an analog signal according to a charged voltage of each capacitor of the sampling capacitor group of the connected analog segment unit,
- wherein the three or more analog segment units sequentially inputs the digital signal, and
- wherein, when a first analog segment unit of the three or more analog segment units is in the sampling phase, a second analog segment unit of the three or more analog segment units is in the integral phase, and the other analog segment units of the three or more analog segment units are in an empty phase of not being connected to the reference voltage, the input terminal and the calculation unit.
Dependencies are inferred from the claim text.