Patent Number: 7,710,076

Title: Back-gate voltage generator circuit, four-terminal back gate switching FET, and charge and discharge protection circuit using same

Abstract: A back-gate voltage generator circuit generating a back-gate voltage of a four-terminal back gate switching MOSFET for charge and discharge control is disclosed. The back-gate voltage generator circuit includes first and second n-type MOSFETs connected in series through a common source electrode. A voltage at the common source electrode of the first and second n-type MOSFETS connected in series serves as the back-gate voltage of the four-terminal back gate switching MOSFET, and the back-gate voltage is used as a reference voltage for generating signals for controlling the first and second n-type MOSFETS.

Inventors: Goto; Tomoyuki (Kanagawa, JP)

Assignee: Ricoh Company, Ltd.

International Classification: H02J 7/00 (20060101)

Expiration Date: 5/04/12018