An exponential charge pump uses a number of identical or similar charging stages, each having a first and second capacitor. During a first clock phase, the first capacitor of each stage is charged by the second capacitor of the preceding stage, and, during a complementary second clock phase, the positive...http://www.google.com/patents/US7605640?utm_source=gb-gplus-sharePatent US7605640 - N-stage exponential charge pumps, charging stages therefor and methods of operation thereof
