Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1996-10-15
1997-12-30
Gaffin, Jeffrey A.
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
341154, 341145, 341118, H03M 178
Patent
active
057035881
ABSTRACT:
In a dual resistor string digital-to-analog converter, current biasing is used to isolate a first resistor string from a second resistor string. The first resistor string consist of multiple first resistors, and a first switch network responsive to the MSBs selectively couples the second resistor string in parallel to any one first resistor within the first resistor string. To prevent the second resistor string from drawing current from the first resistor string, a current source feeds a bias current into the second resistor string and a current drain draws the bias current from the second resistor string. The bias current is adjusted such that the voltage drop across the whole of the second resistor string is equal to the voltage drop across any one first resistor within the first resistor string. Use of a current source and current drain allows one to freely adjust the number of MSBs, LSBs and first and second resistor magnitudes to obtain optimum performance without concern for any adverse nonlinearity effects.
REFERENCES:
patent: 4539553 (1985-09-01), Takeda et al.
patent: 4543560 (1985-09-01), Holloway
patent: 5019821 (1991-05-01), Sugimoto
patent: 5059978 (1991-10-01), Valdenaire
patent: 5093661 (1992-03-01), Tanimoto
patent: 5126740 (1992-06-01), Kawada
patent: 5252975 (1993-10-01), Yuasa et al.
patent: 5495245 (1996-02-01), Ashe
patent: 5619203 (1997-04-01), Gross
Behzad Razavi et al., "A 12-b 5-MSample/s Two-Step CMOS A/D Converter", IEEE Journal of Solid-State Circuits, vol. 27, No. 12, pp. 1667-1678 (Dec. 1992).
Marcel J.M. Pelgrom, "A 10-b 50-MHz CMOS A/D Converter with 75-.OMEGA. Buffer", IEEE Journal of Solid-State Circuits, vol. 25, No. 6, pp. 1347-1352 (Dec. 1990).
Peter Holloway, "A Trimless 16b Digital Potentiometer", ISSCC Digest of Technical Papers, pp. 66-67 and 320-321 (Feb. 1984).
Maloberti Franco
Rivoir Roberto
Torelli Guido P.
Atmel Corporation
Gaffin Jeffrey A.
Schneck Thomas
Vick Jason H.
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