Patent ID: 8339186
Filing Date: 2012-12-25
Classification: G05F,H02M

Abstract:
1. A charge pump circuit comprising: a first input terminal to receive a first reference voltage; a second input terminal to receive a second reference voltage; a first flying capacitor terminal; a second flying capacitor terminal; a third flying capacitor terminal; a fourth flying capacitor terminal; a first switch to selectively couple the first input terminal to the first flying capacitor terminal; a second switch to selectively couple the first flying capacitor terminal to the second input terminal; a third switch to selectively couple the second flying capacitor terminal to the second input terminal; a fourth switch to selectively couple the first flying capacitor terminal to the third flying capacitor terminal; a fifth switch to selectively couple the second flying capacitor terminal to the third flying capacitor terminal; a sixth switch to selectively couple the second flying capacitor terminal to the fourth flying capacitor terminal; a control circuit to select the first, second, third, fourth, fifth, and sixth switches according to a cycling of at least three phases of configuration to generate a third voltage reference at the third flying capacitor terminal and a fourth voltage reference at the fourth flying capacitor terminal; a first flying capacitor coupled between the first and second flying capacitor terminals; a second flying capacitor coupled between the third and fourth flying capacitor terminals; and a reservoir capacitor coupled between the third flying capacitor terminal and the second input terminal.