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:
Feb. 14, 2017
Filed:
Feb. 17, 2015
Altera Corporation, San Jose, CA (US);
Hoong Chin Ng, Sungai Petani, MY;
Altera Corporation, San Jose, CA (US);
Abstract
An integrated circuit with input voltage clamping circuitry for receiving an input signal from external devices is provided. The input voltage clamping circuitry may include a voltage splitting and clamping circuit, a selectively enabled transmission gate circuit, and a digitization and clamping circuit. The voltage splitting and clamping circuit may be configured to split the input signal into at least two separate components each of which is limited to a predetermined voltage swing. The transmission gate circuit may be selectively enabled to provide full rail signaling when the input signal has a power supply level that is below a predefined threshold. The digitization and clamping circuit may include a Schmitt trigger translation for converting the split signal components to a digitized signal that is clamped down to the predefined threshold.