CMOS frequency conversion using dual mixers for sideband suppression
US6782247B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 2, 2001 |
| Grant date | Aug 24, 2004 |
| Priority date | — |
| Expiry date | Dec 25, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D2200/0084
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Disclosed is a frequency conversion circuit with sideband suppression in which a first mixer receives an in-phase signal (IFi) and is driven by a local oscillator having an in-phase (0°) oscillator signal (LOi), and produces two sideband signals (LO+IF, LO−IF). A second mixer receives a quadrature phase frequency signal (IFq+) and is driven by a local oscillator having a quadrature (180°) oscillator signal (LOq), and produces two sideband signals (LO+IFq, LO−IFq). 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.