Fazi

Christian Fazi, Columbia, MD US

Patent application number	Description	Published
20100052652	APPARATUS AND METHOD FOR SPURIOUS-FREE SIGNAL RANGE MEASUREMENT FOR RF CIRCUITRY - The present invention is directed to an apparatus and methodology for performing spurious-free dynamic range (SFDR) measurements on an RF circuit, such as a mixer, using a single analog input port. The present invention is designed for use when access to the intermediate frequency (IF) port in a radio frequency (RF) front-end circuit is not available, when the traditional two-port method for making an SFDR measurement is inadequate. Passing the analog input through a directional coupler between the RF combiner and the mixer facilitates the performance of the traditional third order intermodulation (IMD) test. Key differences between the single-port and traditional two-port setups are considered and examined, and experimental data obtained using the single-port setup is compared to data obtained using the traditional two-port set-up for different mixer models. Comparison of similar results yields confirmation and a calibration to account for the additional losses introduced by the directional coupler.	03-04-2010

Patent application number	Description	Published
20110285480	EQUALIZER WITH A VARIABLE TRANSFER CURVE - Microwave signal equalizer comprising a signal transmission line, a first open stub and a second open stub which are applied in parallel to the said transmission line by a respective connection circuit, said first open stub and second open stub being controlled by at least one second dc control voltage which is applied to the respective connection circuit, said second control voltage being variable and said connection circuit being able to produce a variable resistance upon variation of said second control voltage.	11-24-2011

Patent application number	Description	Published
20110261973	APPARATUS AND METHOD FOR REPRODUCING A SOUND FIELD WITH A LOUDSPEAKER ARRAY CONTROLLED VIA A CONTROL VOLUME - Method and, apparatus for implementing the method, the method comprising determining control signal data for an array of loudspeakers, the control signal data being such as to control the loudspeakers to produce a desired sound field associated with an audio signal, the method comprises determining control signal data for different frequency components of the desired sound field in respect of respective different positions in a listening volume of the loudspeaker array, wherein determination of the control signal data comprises sampling the desired sound field at the surface of a control volume (V).	10-27-2011