Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Patent
1994-04-26
1996-02-27
Hoff, Marc S.
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
341153, H03M 168
Patent
active
054952450
ABSTRACT:
The number of resistors and switches required for a voltage-scaling digital-to-analog converter (DAC) is greatly reduced by segmenting the voltage decrementing resistor string into two separate outer strings and an inner string. The outer strings decrement a full-scale voltage in accordance with the most significant bits (MSBs) of the input digital signal, while the inner string decrements the least significant bits (LSBs); alternately, the outer strings can decrement the LSBs and the inner string the MSBs. Opposite ends of the inner string are connected to corresponding points on the two outer strings through passive switched taps on the outer strings that allow the DAC to function as a potentiometer or rheostat, and "slide" up and down along the two outer strings as the input digital signal varies. An analog output is tapped from a selected point on the inner string whose voltage elevation is controlled by the switching of the outer strings. The outer strings are preferably switched in a sequence that adds a transient finite resistance to the circuit during switching, but avoids large scale glitches due to open circuits or short circuiting part of the string.
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Grebene, Bipolar and MOS Analog Integrated Circuit Design, John Wiley & Sons, 1984, pp. 753-824.
Analog Devices, Inc., Analog Devices 1992 Data Converter Reference Manual, vol. 1, pp. 2-83 to 2-94 and 2-721 to 2-734.
Analog Devices Inc.
Hoff Marc S.
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