US Patent 7902912 Bias current generator

Patent 7902912 was granted and assigned to Analog Devices on March, 2011 by the United States Patent and Trademark Office.

Overview Structured Data Issues Contributors Activity

Is a

Patent

Patent attributes

Current Assignee

Analog Devices

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7902912

Date of Patent

March 8, 2011

Patent Application Number

12054909

Date Filed

March 25, 2008

Patent Primary Examiner

‌

Quan Tra

Patent abstract

A bias current generator for generating bias current is described. The generator comprises an amplifier having an inverting input, a non-inverting input and an output. A first bipolar transistor is associated with one of the inverting and non-inverting inputs of the amplifier. A load MOS device is associated with the other one of the inverting and non-inverting inputs of the amplifier. The load MOS device is driven by the amplifier to operate in the triode region with a corresponding drain-source resistance ron. The first bipolar transistor and the load MOS device are arranged such that a voltage derived from the first bipolar transistor is developed across the drain-source resistance ron of the load MOS device thereby generating a bias current.