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:
Dec. 26, 2000
Filed:
Nov. 09, 1998
Timothy G O'Shaughnessy, Elbert, CO (US);
Other;
Abstract
A self calibrating current mirror circuit has a curent mirror input for receiving an input current, and a current mirror output for providing an output current. The circuit utilizes a comparator, a charge pump and a MOS transistor having a drain connected to pair of transfer gates. In a first mode of operation, the current of the MOS transistor is switched to the current mirror input for calibration. The comparator provides a signal to the charge pump to increase or to decrease the gate voltage of the MOS transistor. In a second mode of operation the current of the MOS transistor is switched to the current mirror output. A plurality of self calibrating current mirror stages are used to obtain a current mirror that provides an output with multiple current levels, for use as a switched current digital to analog converter (DAC).