Patent ID: 7280063
Filing Date: 2007-10-09
Classification: H03M

Abstract:
1. A digital to analog converter comprising: an operational amplifier having an inverting input, a noninverting input, and an output; a first ladder element having a first epot for providing a first voltage, a first capacitor having a first capacitance, an input, and an output, and a first switch for selecting one of the first voltage and a reference voltage as a first selected voltage and for providing the first selected voltage to the input of the first capacitor; and a second ladder element having a second epot for providing a second voltage, a second capacitor having a second capacitance, an input and an output, and a second switch for selecting one of the second voltage and the reference voltage as a second selected voltage and for providing the second selected voltage to the input of the second capacitor; wherein the output of the first capacitor is connected to the output of the second capacitor and to the inverting input of the operational amplifier.