D/A converter capable of producing an analog signal having level

Pulse or digital communications – Repeaters – Testing

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332 9R, 340347AD, 375 25, H04L 2702

Patent

active

047501910

ABSTRACT:
In a digital-to-analog converter, a digital input signal of x bits is subjected to digital-to-analog conversion with at least two of x bit positions recognized as a common bit position and converted into analog levels of a number which is different from 2.sup.x where x is an integer. At least one additional common bit position may be selected from the x bit positions except the common bit position. The digital input signal may be pre-processed by the use of a logic circuit prior to the digital-to-analog conversion so as to control the number of analog levels. The digital-to-analog converter is applicable to a modulator which produces a quadrature amplitude modulated signal having a circular arrangement of signal points on a phase plane. A demodulator comprises an analog-to-digital converter for converting the above-mentioned analog signal into a reproduction of the digital input signal.

REFERENCES:
patent: 4484178 (1984-11-01), Lovgren
patent: 4520490 (1985-05-01), Wei
patent: 4534040 (1985-08-01), Thapar
patent: 4584564 (1986-04-01), Bernardson

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