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. 02, 1989
Filed:
Dec. 11, 1987
Richard E Hester, Eden Prairie, MN (US);
Tuan V Ngo, Eden Prairie, MN (US);
VTC Incorporated, Bloomington, MN (US);
Abstract
Trimming of input offset voltage of a diferential amplifier is provided by a pair of resistance networks which are connected to the emitters of a pair of current mirror transistors. By adjusting the resistances of the resistance networks, the adjustment currents flowing through the current mirror transistors are selected to cancel out the input offset voltage of the differential amplifier. Each resistance network includes a plurality of resistors connected in series with a low resistance shorting link connected in parallel with each of the plurality of resistances. The input offset voltage is trimmed by selectively cutting the shorting links with a two-phase measure and trim process.