Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Patent
1997-11-12
1999-11-30
Tokar, Michael
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
341143, H03M 166
Patent
active
059950315
ABSTRACT:
A multi-bit D/A converter which improves the linearity of an analog output relative to a digital input is provided. A switch control circuit (1) turns on D some of a plurality of switches (S1 to SM) which are arranged in ascending order starting with a switch determined by a start position determination circuit (3) and turns off the remaining switches, the number of switches turned on being dependent on a digital signal (DIG). The start position determination circuit (3) sequentially changes the switches (S1, S3, S5, . . . ) serving as a selection start position to determine the selection start position for each input of the digital signal (DIG) provided in synchronism with a clock signal (CLK).
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Rex T. Baird et al., "Linearity Enhancement of Multibit .DELTA..SIGMA. A/D and D/A Converters Using Data Weighted Averaging," IEEE Transactions on Circuits and Systems--II: Analog and Digital Signal Processing, vol. 42, No. 12, Dec. 1995, pp. 753-762.
Ito Masao
Kumamoto Toshio
Miki Takahiro
Okuda Takashi
Jean-Pierre Peguy
Mitsubishi Denki & Kabushiki Kaisha
Tokar Michael
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