Patent · US Active

Variable current charge pump with modular switch circuit

US7570105B1 · kind B1 · utility

8Cited by

20References

22Claims

0Family size

Assignee

Altera Corporation · US

Inventors

Sun Woo Baek · Cupertino, US
Henry Y. Lui · San Jose, US
Surinder Singh · Fremont, US

Key dates

Filing date	Oct 4, 2007
Grant date	Aug 4, 2009
Priority date	—
Expiry date	Oct 4, 2027

Classification

Technology area (CPC H)Electricity
CPC primaryH03L7/0816
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

A charge pump circuit includes switch circuit modules and current modules. The number of switch circuit modules that are coupled to receive current from one of the current modules is variable. The output current of the charge pump circuit increases as more of the switch circuit modules are coupled to receive current from the current modules. The net on-resistance of the switch circuit modules decreases as more of the switch circuit modules are coupled to receive current from the current modules. Charge coupling caused by the net parasitic gate-to-drain capacitance of switching transistors in the switch circuit modules is reduced at smaller output current settings of the charge pump circuit.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.