Digital-to-analog converter for increasing number of bits converted

A digital-to-analog converter comprising:

• a timer which counts a time cycle, wherein the timer is a ring counter whose outputs alternately become "1" in a time cycle;
• a generator of an addend which is supplied with a digital signal of a first number of bits and generates a value "1" as an addend for the time period corresponding to the value of said digital signal of a first number of bits, and generates a value "0" as an addend for the rest of the time, and wherein the ring counter outputs are combined with said digital signal of a first number of bits;
• an adder which adds said addend as least significant bit to a digital signal of a second number of bits and outputs the sum of them;
• a core digital-to-analog converter which is supplied with said sum and converts it to a corresponding analog signal;
• and
• a filter which is supplied with said analog signal and eliminates the ripples of the input to provide a ripple-eliminated analog signal at its output terminal.