Patent ID: 6509854
Filing Date: 2003-01-21
Classification: H03M

Abstract:
A DA converter comprising:a plurality of current source transistors; and switching means controlled to turn ON and OFF in correspondence with input signals, for selectively feeding currents to a load resistor which forms an analog output voltage, the currents being formed by said plurality of current source transistors; wherein each of said current source transistors is operated in an operating range from a saturation region to a non-saturation region as said analog output voltage enlarges in absolute value; and said plurality of current source transistors includes first current source transistors and second current source transistors, the second current source transistors having a larger size than the first current source transistors, such that output currents of the second current source transistors are greater than output currents of the first current source transistors for a given drain-source voltage corresponding to the analog output voltage, so that a current for compensating for a current decrement ascribable to operation thereof in the non-saturation region may be caused to flow in each of the second current source transistors.