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:
Jun. 12, 2012
Filed:
Mar. 23, 2009
Joel Chatal, Carquefou, FR;
Joel Chatal, Carquefou, FR;
Atmel Corporation, San Jose, CA (US);
Abstract
A low current comparator with programmable hysteresis is disclosed that uses a ratio of latch intrinsic (internal) latch capacitance and capacitance of a sample capacitor to adjust hysteresis. In some implementations, the comparator includes a switch capacitor sampling stage coupled to a dynamic latch output stage. Depending on an output state (or) of the comparator, hysteresis is generated by adding or subtracting a first charge stored in the latch intrinsic capacitance to or from a second charge stored in the sampling capacitor. The ratio of latch intrinsic capacitance and the capacitance of the sampling capacitor can be adjusted to trim hysteresis value. The hysteresis function does not require additional capacitors or additional logic.