National Taiwan University

Sebastian Hoppner

Zuo-Min Tsai

Huie Wang

A differential signal driven direct-current voltage generating device is proposed, which is designed for use with a PLL (phase-locked loop) circuit or a DLL (delay-locked loop) circuit system for generating an output of a direct-current (DC) voltage in response to a pair of differential signals, such as phase-difference signals; and which is characterized by the utilization of a capacitor-switched voltage doubler for doubling the output voltage of a charge pump so that the doubled voltage can be used as a control voltage for a PLL-VCO (voltage-controlled oscillation) or a DLL-VCDL (voltage-controlled delay line) circuit for generation of an output oscillating signal with a wider frequency range.

Differential signal driven direct-current voltage generating device

A switched-capacitor charge pump device is proposed, which is designed for integration to a circuit system, such as a PLL (phase-locked loop) circuit system, for generation of an output direct-current (DC) voltage with a wide amplitude range; and which is characterized by the utilization of two switched-capacitor circuit units in addition to the output capacitor circuit and the utilization of an output voltage comparing circuit (such as a Schmitt trigger) for comparing the end-result output DC voltage against a half-amplitude drive voltage such that when the switched-capacitor circuit units are subjected to a charging-discharging action for voltage pump-up or pump down operations, the switched-capacitor circuit units are switched between a full-amplitude drive voltage and a half-amplitude drive voltage. This feature allows the invention to provide an output DC voltage with a wider amplitude range than prior art.

Growing community of inventors

Taipei, Taiwan

Sebastian Hoppner