Nec Corporation

Nami Inamasu

Mitsutoshi Sugawara

For reduction in component elements, there is disclosed a digital-to-analog converter circuit for converting a digital input signal consisting of high-order bits and low-order bits into an analog output signal, comprising, (a) a first digital-to-analog converting circuit operative to produce a first current the amount of which corresponds to a value represented by the high-order bits, (b) a memory circuit storing an error data information in each address specified by each of values represented by the high-order bits, (c) an arithmetic circuit operative to carry out arithmetic operations on the low-order bits and the error data information to produce amended low-order bits, (d) a second digital-to-analog converting circuit operative to produce a second current the amount of which corresponds to a value represented by the amended low-order bits, and (e) an analog adder operative to add the first current weighted by a predetermined factor to the second current to produce an analog output signal, so that the analog output signal precisely corresponds to the digital input signal.

Digital-to-analog converter circuit

In a digital to analog converter, a digital signal is divided into two groups of upper bits and lower bits which are converted to a first and second analog signals respectively. The digital analog converter comprises means for adding a predetermined value of a signal to the lower bits. A carry signal in the addition of the predetermined value is applied to the upper bits. The upper and lower bits of the digital signal thus controlled are converted to a first and second analog signals separately. Thereafter, the two signal are added to produce an analog signal after the second analog signal is attenuated by an attenuating factor depending on the number of the lower bits.

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Tokyo, Japan

Nami Inamasu