Patent ID: 7956784
Filing Date: 2011-06-07
Classification: H03M

Abstract:
1. A DA converter comprising: a decoder that decodes a digital decoder input signal into a first decoded signal for causing a first current to flow in a first current path and a second decoded signal for causing a second current to flow in a second current path; a differential switch that outputs a current provided from a current source selectively to the first current path and the second current path based on the first decoded signal and the second decoded signal output from the decoder; and a current-voltage converting section that outputs an analog signal at a voltage level according to the first current output from the first current path, wherein the first current path is connected to an output of the current-voltage converting section via a feedback resistor, and the second current path is connected to the output of the current-voltage converting section, and wherein a current amount drawn by the current-voltage converting section is a fixed current equal to the first current plus the second current, and is independent of the first and second decoded signals.