Charge pump circuit
US7589583B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Nov 13, 2007 |
| Grant date | Sep 15, 2009 |
| Priority date | — |
| Expiry date | Nov 13, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/073
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention is mainly directed to providing a charge pump circuit which realizes low power consumption. A first clock signal is supplied from an oscillator circuit to capacitor elements forming a charge pump circuit. A current generation circuit controls a current flowing through each of inverters by controlling operation of PMOS and NMOS, and as a result controls the frequency of the first clock signal. A gate and a drain of PMOS are short-circuited, and between the node thereof and a ground terminal a constant current generation circuit and a resistor are connected in parallel. The constant current generation circuit serves to keep the current flowing through the inverters constant against a change of a power supply voltage. Therefore, the frequency of the clock signal is reduced according to the increase of the power supply voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.