CHARGE PUMP POWER SUPPLY WITH NOISE CONTROL

摘要

An embedded power supply for providing a voltage required potential on a dectector module (100) within an imaging system provides the required potential to the module from charge stored on an output capacitor (250). Charge on the capacitor (250) is replenished by injecting, commonly referred to as pumping, current into the capacitor by pulses of current generated by switching mode circuitry (230). Charge pumping into the capacitor is efficient because energy is stored in low-loss passive components and transferred into the low-loss output capacitor through the power supply low-impedance paths. Switching noise of power supply is eliminated by turning off the charge pumping circuit during periods when such noise would disrupt the operation of the module, for example when the module (100) is reading out image data. The output capacitor (250) is large enough to supply the required voltage to the module for a certain period when the capacitor is not being pumped.