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:
Oct. 06, 1987
Filed:
May. 12, 1986
Roberto Finaurini, Ancona, IT;
SGS Microelettronica S.p.A., Catania, IT;
Abstract
This dynamic protection device is particularly intended for integrated circuits having input MOS stages and logic or analog inputs fed by voltages and/or currents whose value can increase above those bearable with traditional protection systems. The device is composed of a first section for protection against voltages above a first set threshold value and a second protection section against voltages below a set threshold value. The device is made in MOS technology and is disposed between the input of the circuit to be protected and the power supply. The two sections operate as turned off switches with input voltage within the allowed voltage range and selectively turned on outside of that range, such that on the input voltage exceeding the upper threshold the first section switches on absorbing current at the input and conveying it toward the power supply, while on the voltage dropping below the lower threshold the second section becomes active absorbing from the power supply the current and conveying it to the input. The threshold values can be set when designing the device selecting suitable manufacture technologies and implantation levels.