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:
May. 05, 1998
Filed:
Aug. 19, 1996
Motorola, Inc., Schaumburg, IL (US);
Abstract
The present invention describes a bias generator (10) which supplies a temperature stabilizing bias current (72) to a main circuit (90). The bias generator (10) comprises a measurement unit (20) having a similar structure and temperature characteristic as the main circuit (90). Measurement unit (20) supplies a temperature dependent measurement signal (27). A temperature invariant element (40) supplies a temperature independent reference signal (47). These signals (27, 47) are compared in a differential amplifier (30) which controls variable current sources (50, 60, 70). The variable current sources (50, 60) supply the measurement unit (20), the temperature invariant element (40) and the bias current (72) for the main circuit (90) itself. A negative feedback is produced which results in a stabilized transconductance of the main circuit (90). Therefore, the bias current (72) which determines all other currents and the speed of the main circuit (90) is automatically adjusted to the needs. Power consumption can be reduced and the reliability of the main circuit (90) can be improved.