Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Patent
1988-05-23
1990-07-10
Shoop, Jr., William M.
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
341144, H03K 1302
Patent
active
049409786
ABSTRACT:
A highly accurate, inexpensive digital to analog converter requiring minimal accuracy in component values. A digital word is received serially, the least significant bit first. A voltage is stored on a capacitor at each bit, the value of the voltage being halfway between a reference voltage and the previously stored voltage, the reference voltage value depending on whether the bit is a logic "1" or "0". In each case, the halfway point of the voltage difference is determined by coupling to the midpoint of a pair of resistive components having essentially the same value. The value of the stored voltage represents the analog value of the digital word. The process is preferably repeated for the same word and the two resulting final voltages is averaged to eliminate any effect of a slight difference in component values in a pair.
REFERENCES:
patent: 4491825 (1985-01-01), Tuthill
patent: 4611195 (1986-09-01), Shosaku
patent: 4618847 (1986-10-01), Iida et al.
patent: 4638303 (1987-01-01), Masuda et al
patent: 4665380 (1987-05-01), Lewyn
Kim Helen
Shoop Jr. William M.
Zenith Electronics Corporation
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