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US Patent 9148140 Integrated circuit with precision current source

Patent 9148140 was granted and assigned to Maxim Integrated on September, 2015 by the United States Patent and Trademark Office.

Overview Structured Data Issues Contributors

Is a

Patent

Patent attributes

Patent Applicant

Maxim Integrated Products

Current Assignee

Maxim Integrated

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

91481400

Date of Patent

September 29, 2015

Patent Application Number

141705570

Date Filed

January 31, 2014

Patent Citations Received

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US Patent 11755850 Single transistor multiplier and method therefor

Patent Primary Examiner

Jung Kim

Patent abstract

An integrated circuit with precision current source includes a first MOSFET, a second MOSFET, an op-amp and a resistor formed on a common semiconductor substrate. The first MOSFET is characterized by a first multiplier (xM1) and the second MOSFET is characterized by a second multiplier (xM2) where a ratio of xM2 to xM1 is greater than one. An inverting input of the op-amp is coupled to a drain of the first MOSFET and an output of the op-amp is coupled to a gate of the first MOSFET. A negative feedback circuit limits a rise in output current under low output voltage conditions.