Digital-to-analog converter with cyclic control of current sourc

Details Digital-to-analog converter with cyclic control of current sourc Digital-to-analog converter with cyclic control of current sourc

1988-11-18

1990-06-19

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341144, 341153, 341154, H03M 176

Patent

active

049357417

ABSTRACT:
In digital-to-analog converters with "rotating" current sources for converting an n-bit binary signal to an analog output signal, a single cyclic shift register is replaced by m cyclic shift register portions each having p=(2.sup.n -1)/m inputs, and the n-digit binary signal to be converted is changed into the thermometer code by means of a code converter. The middle output of the code converter and equal numbers of code converter outputs on both sides thereof are connected to one of the shift register portions. According to the same rule, the code converter outputs located further from the middle are connected to the other shift register portions. Thus, a clock signal serving as a shift signal for the shift register portions only needs to have a frequency which is p times that of the sampling signal with which an, e.g., analog, audio signal is digitized.

REFERENCES:
patent: 3831167 (1974-08-01), Tewksbury
patent: 3911427 (1975-10-01), Schlichte
patent: 3982172 (1976-09-01), van de Plassche
patent: 4225816 (1980-09-01), Schade
patent: 4521764 (1985-06-01), Burton
patent: 4703310 (1987-10-01), van de Plassche
P. E. Danielsson, "The Glitch-Free D/A Converter," Digital Processes, 5, 1979, pp. 122-140.
R. J. v. d. Plassche, "Monolithic 14-Bit DAC with 85 dB S
Ratio," Electronic Components and Applications, vol. 2, No. 4, Aug. 1980, pp. 235-241.
Rudy van de Plassche, "Dynamic Element Matching Puts Trimless Converters on Chip," Electronics, Jun. 16, 1983, pp. 130-134.

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