The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 28, 2012
Filed:
May. 27, 2008
Benjamin A. Douts, Tewksbury, MA (US);
Quan Wan, Belmont, MA (US);
Benjamin A. Douts, Tewksbury, MA (US);
Quan Wan, Belmont, MA (US);
Analog Devices, Inc., Norwood, MA (US);
Abstract
A voltage boost circuit is driven with a clock signal CLK which toggles between voltages Vand V. A first MOSFET is coupled between CLK and an output node OUT, and at least one additional MOSFET is coupled between OUT and a supply voltage. The first terminal of a capacitance is coupled at its first terminal to OUT, and at its second terminal to a delay circuit arranged to toggle its output to ˜Vor ˜Va predetermined amount of time after the voltage applied to the clock signal side of the first MOSFET toggles to ˜Vor ˜V, respectively. The capacitance is charged to ˜Vwhen the voltage applied to the clock signal side of the first MOSFET toggles to ˜V, and OUT is increased to a voltage greater than Vwhen the output of the delay circuit toggles to ˜V. The only active device junctions subjected to the boosted voltage are MOSFET well-substrate junctions, such that no active devices are overstressed.