Patent ID: 6204785
Filing Date: 2001-03-20
Classification: H03M

Abstract:
A data converter, comprising:an input for receiving an input signal;an output for providing an output signal formed in response to the input signal;a string of series-connected resistive elements having in total a string resistance and providing a plurality of voltage taps, wherein at least one of the voltage taps is accessible in response to the input signal and for forming the output signal; anda calibration circuit, comprising:a plurality of trimming transistors connected in parallel to selected ones of the plurality of voltage taps, wherein each of the trimming transistors has an adjustable resistance; andadjustment circuitry for selectively adjusting the adjustable resistance of a trimming transistor connected in parallel to two of the plurality of voltage taps in response to a ratio of a resistance between the two of the plurality of voltage taps relative to the string resistance.