Patent ID: 7982520
Filing Date: 2011-07-19
Classification: H03M

Abstract:
1. A signal generating apparatus that outputs from an output end thereof an output voltage corresponding to input data supplied thereto, comprising: a DA converter that outputs a voltage corresponding to data supplied thereto; a capacitor section that is provided between the output end and a standard potential; a transmission switch that provides a connection or a disconnect between a voltage generating end of the DA converter and the output end; and a control section that causes the DA converter to charge the capacitor section with a voltage corresponding to the input data by repeatedly connecting and disconnecting the transmission switch, thereby causing the voltage of the capacitor section to gradually approach the output voltage corresponding to the input data, wherein the DA converter includes: during a refresh mode, the controller charges the capacitor array to a reference potential, and during an output mode that follows the refresh mode, the controller switches a ratio between (i) a capacitance between the voltage generating end and a common potential in the capacitor array and (ii) a capacitance between the voltage generating end and the reference potential in the capacitor array, according to data supplied thereto, thereby causing a voltage corresponding to the data supplied thereto to be generated from the voltage generating end.