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:
Apr. 23, 2002
Filed:
Nov. 06, 2000
Horia Giuroiu, Campbell, CA (US);
Oki Semiconductor, Sunnyvale, CA (US);
Abstract
A precision bias is provided for a differential transconductor. The precision bias includes a bias circuit, a differential amplifier and a current mirror. The current mirror includes at least two mirror transistors, one of which is connected to the bias circuit, and th other of which is connected to the differential amplifier. The bias circuit provides a bias current, which the current mirror accurately reflects to the differential amplifier as a tail current. By providing identical operating conditions to the bias circuit and first mirror transistor as are seen at the differential amplifier and second mirror transistor, the precision bias can more accurately reflect the bias current into the tail current. This can reduce the DC output currents of the differential amplifier to substantially zero, which improves its performance. A second bias circuit provides the gate-source voltage of the two transistors forming the load of the differential transconductor.