Patent ID: 6759975
Filing Date: 2004-07-06
Classification: H03M

Abstract:
A digital-to-analog converter circuit that is arranged to drive a capacitive load, the circuit comprising:a current digital-to-analog converter that is configured to provide a first current to a sense node in response to a digital input signal, wherein the current digital-to-analog converter is coupled to a first power supply node; a first resistance circuit that is coupled between the sense node and a second power supply node; a second resistance circuit that is coupled between the sense node and an output node; and an amplifier circuit having a first amplifier input, a second amplifier input, and an amplifier output, wherein the amplifier circuit is configured to receive a reference signal at the first amplifier input, the second input is coupled to the sense node, the amplifier output is coupled to the output node, the amplifier circuit is arranged such that the voltage associated with the sense node is approximately constant when steady state conditions are reached, the amplifier circuit is further coupled to a local power supply node, and wherein the local power supply node has a voltage that is higher than a voltage that is associated with the first supply node relative to the second power supply node.