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:
Jun. 06, 2006
Filed:
Apr. 21, 1997
Edward W. Liu, Sunnyvale, CA (US);
Edward W. Liu, Sunnyvale, CA (US);
LSI Logic Corporation, Milpitas, CA (US);
Abstract
A method of canceling noise in analog circuits is described along with noise cancellation circuits. Analog circuits are sensitive to noise. Especially in mixed signal environments where digital circuits and analog circuits are combined, the noise generated by relatively noisy digital circuits often cause the analog circuits to produce incorrect output signals. Instead of shielding or separating the susceptible analog circuits from noisy digital circuits, additional circuitry is added where one of the added circuits, denoted as the noise separator circuit, produce only the noise component of the output signal, the first output, of the analog circuit adversely affected by the noise. Then, another circuit is used to subtract the noise from the first output, thereby producing a noise-free output signal. Alternatively, the noise separator circuit can be made to produce the inverse of the first output, including the inverse of the noise. Then, the first output and the inverse output can be added and halved to produce the desired, noise-free output.