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:
Aug. 24, 2004
Filed:
Apr. 02, 2001
Christopher D. Nilson, San Jose, CA (US);
Thomas G. McKay, Felton, CA (US);
Zeevo, Inc., Santa Clara, CA (US);
Abstract
Disclosed is a frequency conversion circuit with sideband suppression in which a first mixer receives an in-phase signal (IF ) and is driven by a local oscillator having an in-phase (0°) oscillator signal (LO ), and produces two sideband signals (LO+IF, LO−IF). A second mixer receives a quadrature phase frequency signal (IF +) and is driven by a local oscillator having a quadrature (180°) oscillator signal (LO ), and produces two sideband signals (LO+IF , LO−IF ). One of the sidebands from the second mixer is 180° out of phase with respect to the same sideband from the first mixer. A signal combiner then receives and combines the two sidebands from the first mixer and the two sidebands from the second mixer, the signal combiner suppressing one sideband and enhancing the other sideband. In preferred embodiments, the mixers comprise MOSFET transistors and the signal combiner comprises capacitive elements.