Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Patent
1988-07-22
1991-05-07
Shoop, Jr., William M.
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
341153, H03M 168
Patent
active
050140540
ABSTRACT:
A digital-to-analog converter of the resistor string type comprises a string of resistors for dividing a reference voltage into a series of divided voltages, and a switch matrix circuit for selectively generating the divided voltages as an analog signal when activated in response to a digital signal. The string of resistors are divided and folded into four square arrays, one pair of the four square arrays being arranged diagonally to the other pair of the four square arrays respectively. The switch matrix circuit includes four switching circuits for generating respective ore divided voltages from the four square arrays when activated respectively, and four decoder circuits for activating the four switching circuits in response to the digital signal respectively and for generating the respective one divided voltages from the four switching circuits in relation to a portion of the digital signal respectively. Furthermore, a selector is responsive to the digital signal for selecting one of the respective one divided voltages from the four decoder circuits in relation to the remaining portion of the digital signal to generate the selected one divided voltage as the analog signal.
REFERENCES:
patent: 4318085 (1982-03-01), Whiteside et al.
patent: 4491825 (1985-01-01), Tuthill
patent: 4543560 (1985-09-01), Holloway
patent: 4647903 (1987-03-01), Ryu
patent: 4665381 (1987-05-01), Masuda et al.
"Nonlinearity Analysis and Evaluation of Resistor String A/D Converters": A Thesis on pp. 941-948 of National Convention Record edited by the Institute of Electronics, Information and Communication Engineers in Japan, '84/12 vol. J67-CNo. 12.
Partial Copy of National Convention for 70th Anniversary of the Institute of Electronics, Information and Communication Engineers.
Harada Takuya
Oshita Koji
Hoff Marc S.
Nippondenso Co. Ltd.
Shoop Jr. William M.
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