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:
Feb. 27, 2001
Filed:
Jul. 24, 1998
Kyeongho Lee, Seoul, KR;
Deog-Kyoon Jeong, Seoul, KR;
Global Communication Technology Inc., Santa Clara, CA (US);
Abstract
A VCO-mixer structure in accordance with the present invention includes a multi-phase VCO and a multi-phase mixer. The VCO includes a plurality of differential delay cells and the mixer includes a differential amplifying circuit and a combining circuit. The differential amplifying circuit of the multi-phase mixer includes two load resistors coupled to two differential amplifiers, respectively. The combining circuit includes bias transistors, first combining unit and second combining unit coupled to the bias transistors, respectively, and a current source coupled to the first and second combining units. The first combining unit includes a plurality of transistor units, and the second combining unit includes a second plurality of transistor units. Preferably, each of the plurality of transistor units includes a plurality of serially connected transistors, wherein the serially connected transistors are coupled in parallel with the serially connected transistors of the plurality of transistor units.