Patent ID: 6195030
Filing Date: 2001-02-27
Classification: H03M

Abstract:
A method for providing a Digital to Analog converter analog output in Integrated Circuit Digital to Analog Converter applications, said analog output being stable over temperature and supply changes, independent on transistor parameters of a particular chip, and stable for transistor parameter variation from chip to chip, comprising:the steps of implementing an integrated circuit reference cell (primary reference quantity);generating an internal (secondary) reference quantity determining the analog Digital to Analog Converter (DAC) output;referencing the said internal (secondary) reference quantity for the Digital to Analog converter to an chip device specific internal (primary) reference output from the chip in question, and processing further the said chip device specific internal (primary) reference output, in order to derive a fixed predetermined DAC reference value, that is equal for any chip; andsaid fixed predetermined DAC reference value being supplied to the said Digital to Analog converter.