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:
Sep. 06, 1994
Filed:
Apr. 23, 1992
Applicant:
Inventors:
Bert White, Irvine, CA (US);
Mehrdad Negahban-Hagh, Irvine, CA (US);
Assignee:
Silicon Systems, Inc., Tustin, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K / ;
U.S. Cl.
CPC ...
307501 ; 307304 ; 307490 ; 307491 ; 307571 ; 307585 ;
Abstract
A precision resistor using MOS devices. The present invention utilizes an NMOS resistive element to simulate the resistor. A pair of PMOS source followers are implemented to control the value of the resistor and cancel the non-linearity due to the drain-source voltage V.sub.ds. A pair of NMOS source followers serve to eliminate non-linear distortions due to the 'body effect' that can exist in the resistive element. The resistor circuit of the present invention provides higher precision, linearity and high value resistors in a smaller area than prior art MOS resistors.