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:
Mar. 23, 2021
Filed:
May. 27, 2020
International Business Machines Corporation, Armonk, NY (US);
Yang You, Austin, TX (US);
Glen A. Wiedemeier, Austin, TX (US);
Chad Andrew Marquart, Austin, TX (US);
Jeffrey Kwabena Okyere, Austin, TX (US);
Daniel M. Dreps, Georgetown, TX (US);
Sudipto Chakraborty, Plano, TX (US);
INTERNATIONAL BUSINESS MACHINES CORPORATION, Armonk, NY (US);
Abstract
A method and apparatus are described to implement a bandpass filter in a current mode logic (CML) stage of a clock tree in an electronic system. The bandpass filter has a bandpass filter transfer function to attenuate frequencies lower than and higher than a carrier frequency. The bandpass filter uses adjustable active inductors and capacitive source degeneration. Adjustable resistors may be controlled to move a peak frequency of the bandpass filter transfer function to a higher or lower frequency. The adjustable active inductors and capacitive degeneration may consist of field effect transistors.