Patent ID: 6654469
Filing Date: 2003-11-25
Classification: H03M

Abstract:
A device for reducing sampling noise comprising:first and second input switches adapted to connect an input voltage at the same time and further adapted to disconnect the input voltage at the same time; first and second circuits adapted to store a sampling voltage equal to the input voltage, the first circuit adapted to store the sampling voltage upon connection of the first input switch to the input voltage and the second circuit adapted to store the sampling voltage upon connection of the second input switch to the input voltage; first and second output switches adapted to alternatively connect the first and second circuits to an output capacitance; and an output capacitance adapted to store output voltages, a first output voltage comprising a starting voltage plus a first transfer voltage transferred from the first circuit when the first circuit is connected to the output capacitance and a second output voltage comprising the first output voltage plus a second transfer voltage transferred from the second circuit when the second circuit is connected to the output capacitance, the first transfer voltage further comprising a voltage equal to one-half a voltage difference between the sampling voltage and a historical voltage previously stored on the output capacitance and the second transfer voltage further comprising a voltage sufficient to raise the output voltage of the output capacitance to approximately the level of the input voltage.