Loading patent…
AssigneeFreescale Semiconductor, Inc.
InventorsMasami Aiura, Satoshi Takahashi, Yuichi Nakatani
Estimating the term…
A method for selecting cells in response to input codes of a digital-to-analog converter distributes noise based on cyclicality of selection patterns to reduce its value, without being dependent upon the input codes. A 6-bit current output type digital-to-analog converter has 63 current source cells C01 through C63. A prime number of, or 61, current source cells are used as cyclically selected cells. That is, 61 current source cells C02-C62, ranging from the second left-most current source cell C02 to the second right-most current source cell C62, are used as cyclically selected cells. The remaining left-most current source cell C01 and right-most current source cell C63 are used as non-cyclically selected cells. The cyclically selected cells, including the 61 current source cells, are selected in response to input codes using a Data Weighted Average (DWA) technique.
In a current output type digital-to-analog converter having a plurality of current source cells, a method of selecting cells in response to an input code, the method comprising the steps of:
Dependencies are inferred from the claim text.