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:
Aug. 11, 1998
Filed:
Nov. 06, 1996
Edward T Lewis, Sudbury, MA (US);
Raytheon Company, Lexington, MA (US);
Abstract
Bias networks for producing a predetermined bias current for another circuit are provided. The bias networks include compensation subcircuits which provide compensation for process variations in the transistors in the network. Circuit implementations which allow for compensation for power supply voltage variations are also provided. The bias networks include a biasing transistor and a corresponding compensation transistor on the same chip which compensation transistor will have substantially the same process variations as the biasing transistor. The compensation transistor is interposed at a node in a control path and draws current at the node such that a change in the current drawn by the compensation transistor causes a change in the input voltage of the biasing transistor to thereby adjust the bias current produced by the transistor to maintain the bias current within design specifications despite process variations. Bias circuit configurations for a cascode amplifier, a differential amplifier, and a current mirror are provided.