发明名称 |
MULTIPLYING-ADDING RETURN TO ZERO DIGITAL TO ANALOG CONVERTER CIRCUIT AND METHOD |
摘要 |
A digital to analog converter (DAC) method and apparatus employs a multiplying-adding DAC, eliminating digital adder circuitry. Examples are given for multiplying a 3-bit binary number by a 2-bit binary number; however, there are no limitations to the bit-widths of the numbers to be multiplied. The multiplying-adding DAC method can be scaled up or down in bit-width by feeding the DAC with partial sums and adjusting the DAC weights accordingly. An analog to digital converter (ADC) can be placed after the DAC to generate a digital output. By multiplexing preset digital data into the DAC core for return to zero (RTZ), a true zero that is the midpoint of the DAC output range is achieved. It does not return to a rail for single-ended outputs. RTZ in DAC circuits doubles the null frequency of sin(x)/x roll-off inherent in DACs and also helps reduce switching glitches in the DAC output.
|
申请公布号 |
US2010309036(A1) |
申请公布日期 |
2010.12.09 |
申请号 |
US20090477972 |
申请日期 |
2009.06.04 |
申请人 |
BAE SYSTEMS INFORMATION AND ELECTRONIC SYSTEMS INTEGRATION INC. |
发明人 |
TURNER STEVEN E.;ELDER, JR. RICHARD B. |
分类号 |
H03M1/66 |
主分类号 |
H03M1/66 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|