Abstract
In this work, a low noise regulated charge pump circuit is presented. The proposed charge pump uses a digital frequency shaped clock scheme to spread tonal energy of the oscillator to overall frequency ranges, and reduces the output noise of the charge pump, and improves the power efficiency. To achieve constant output voltage during an over loading condition, the proposed charge pump utilizes feedback. The proposed charge pump generates 4.1V ∼ 4.4V output voltage and provides 30mA current driving capability with 30mV ripple at 2.5V ∼ 3.5V supply line. At 800MHz ∼ 2.2GHz ranges, the output noise power of the proposed charge pump is at least 11.4dBm less than that of a charge pump with normal clock.
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