Local oscillator leak cancellation circuit
US6167247A · kind A · utility
48Cited by
7References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 15, 1998 |
| Grant date | Dec 26, 2000 |
| Priority date | — |
| Expiry date | Jul 15, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03C1/06
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method for reducing the level of an undesired signal, generated through a frequency converter device, by implementing a local oscillator (hereinafter "LO") leak cancellation circuit. A feedback correction loop, for a radio frequency (RF) transmitter or receiver, reduces an undesired local oscillator leak generated through a single input frequency converter device, such as a mixer, by a unique detection circuit. A unique nulling circuit is also implemented for a multiple input frequency converter device, such as a quadrature modulator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.