Amplitude modulation for pass gate to improve charge pump efficiency
US9083231B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 2013 |
| Grant date | Jul 14, 2015 |
| Priority date | — |
| Expiry date | Sep 30, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/076
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Techniques are presented for improving the efficiency of charge pumps. A charge pump, or a stage of a charge pump, provides its output through a pass gate. For example, this could be a charge pump of a voltage doubler type, where the output is supplied through pass gate transistors whose gates are connected to receive the output of an auxiliary section, also of a voltage doubler type of design. The waveforms provided to the gates of the pass gate transistors are modified so that their low values are offset to a higher value to take into account the threshold voltage of the pass gate transistors. In a voltage doubler based example, this can be implemented by way of introducing diodes into each leg of the auxiliary section.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.