Digital-to-analog converter using different multiplicators between first and second portions of a data holding period

A digital-to-analog converter, characterized by comprising:

• a plurality of data holding unit for holding plural pieces of digital data input at predetermined intervals;
• a plurality of multiplying unit for receiving said digital data held in each of said plurality of data holding unit, and performing a multiplying process using different multiplicators between a first half and a second half of a data holding period;
• an adding unit for performing a process of adding up multiplication results of said plurality of multiplying unit;
• a stepwise voltage waveform generation unit for generating a stepwise analog voltage corresponding to the digital data obtained by said adding unit;
• and
• an integrating unit for performing analog integration plural times on the analog voltage generated by said stepwise voltage waveform generation unit,
• characterized in that each of the multiplicators used in the multiplying processes by said plurality of multiplying unit corresponds to each of the values of step functions obtained by differentiating plural times piecewise polynomials for a predetermined sampling function configured by the piecewise polynomials.

A digital-to-analog converter, characterized by comprising:

• a plurality of data holding unit for holding plural pieces of digital data input at predetermined intervals;
• a plurality of multiplying unit for receiving said digital data held in each of said plurality of data holding unit, and performing a multiplying process using different multiplicators between a first half and a second half of a data holding period;
• an adding unit for performing a process of adding up multiplication results of said plurality of multiplying unit;
• a stepwise voltage waveform generation unit for generating a stepwise analog voltage corresponding to the digital data obtained by said adding unit;
• and
• an integrating unit for performing analog integration plural times on the analog voltage generated by said stepwise voltage waveform generation unit,
• characterized in that times of said analog integration is two, and an analog signal whose voltage level changes like a quadric function is output from said integrating unit.

A digital-to-analog converter, characterized by comprising:

• a plurality of data holding unit for holding plural pieces of digital data input at predetermined intervals;
• a plurality of multiplying unit for receiving said digital data held in each of said plurality of data holding unit, and performing a multiplying process using different multiplicators between a first portion of a data holding period and a second portion of the data holding period;
• an adding unit for performing a process of adding up multiplication results of said plurality of multiplying unit;
• a stepwise voltage waveform generation unit for generating a stepwise analog voltage corresponding to the digital data obtained by said adding unit;
• and
• an integrating unit for performing analog integration plural times on the analog voltage generated by said stepwise voltage waveform generation unit.