Patent ID: 8054302
Filing Date: 2011-11-08
Classification: G09G,H03M

Abstract:
1. A DAC (digital to analog converter) configured to convert digital data to an analog voltage, the digital data having upper bit data, control bit data, and lower bit data, the DAC comprising: a control logic configured to receive the upper bit data and the control bit data and provide a control logic output; a first resistor circuit configured to divide first and second reference voltages to output a plurality of first division voltages; a first decoder coupled to the control logic and the first resistor circuit and, configured to provide a selected one of the plurality of first division voltages as a first decoder output in response to the control logic output; a second resistor circuit configured to divide third and fourth reference voltages to output a plurality of second division voltages; a second decoder receiving the lower bit data, coupled to the second resistor circuit, and configured to provide a selected one of the plurality of second division voltages as a second decoder output in response to the lower bit data; a selection circuit receiving the control bit data, coupled to the second resistor circuit, and configured to provide a selected one of the third and fourth reference voltages as a selection circuit output voltage in response to the control bit data; and a sample and hold circuit coupled to the first and second decoders, and configured to output the analog voltage in response to the first decoder output, the second decoder output, and the selection circuit output voltage.