Freescale Semiconductor,inc.

Motorola Corporation

John Avis Shepherd

Kamel Abouda

Bertrand Vrignon

Patrick Douziech

There is described a method of optimizing the design of an electronic device with respect to electromagnetic emissions based on frequency spreading. With the method, a designer can, for example, perform a transient simulation on the device only once, and then add frequency spreading with specific parameters by simulation. The resulting frequency spread signal can be observed. The designer can thus evaluate the reduction in electromagnetic emission level, and repeat this process by iteratively applying frequency spreading each time with specific parameters but without having to modify the schematic of the device and to perform another simulation of the device. The method according to this innovation is extremely rapid as the simulation of the design does not need to be repeated at each run of the frequency spreading simulation.

Method of optimizing the design of an electronic device with respect to electromagnetic emissions based on frequency spreading introduced by software, computer program product for carrying out the method and associated article of manufacture

There is described a method of optimizing the design of an electronic device with respect to electromagnetic emissions based on frequency spreading. With the method, a designer can, for example, perform a transient simulation on the device only once, and then process the obtained signal data to add frequency spreading with specific parameters by post-processing. The resulting data can be filtered by various methods and the resulting spectrum observed. The designer can thus evaluate the reduction in electromagnetic emission level, and repeat this process by iteratively applying frequency spreading each time with specific parameters but without having to modify the schematic of the device and to perform another simulation of the device. The post-processing according to this innovation is extremely rapid as it is not a simulation process such as SPICE&#x2122;, ADS&#x2122;, etc. Only data is manipulated.

Method of optimizing the design of an electronic device with respect to electromagnetic emissions based on frequency spreading introduced by data post-processing, computer program product for carrying out the method and associated article of manufacture

There is described a method of optimizing the design of an electronic device with respect to electromagnetic emissions based on frequency spreading. With the method, a designer can add frequency spreading with specific parameters by hardware. The resulting frequency spread signal can be observed. The designer can thus evaluate the reduction in electromagnetic emission level, and repeat this process by iteratively applying frequency spreading each time with specific parameters but without having to modify the design of the device and to generate another prototype of the device.

Method of optimizing the design of an electronic device with respect to electromagnetic emissions based on frequency spreading introduced by hardware, computer program product for carrying out the method and associated article of manufacture

Method and system for tuning a tunable antenna uses a comparison between a signal response at two different tuning frequencies to determine how or if the tuning needs to be further adjusted. With the approach, the method and system arrive at a frequency shift that is centered about the desired antenna frequency, which point there is no net change in the signal response. In a further aspect, a frequency to which a tuned antenna is tuned is shifted to verify whether the antenna is still in tune. Modifications to minimize disturbance of the output received signal that would otherwise be caused by the frequency shifting are contemplated.

Method and system for tuning an antenna

An apparatus and method for tuning a filter ( ) with oscillator alignment for applications where the filter tuning signal ( ) is generated independently of the local oscillator tuning signal and the tuning range is large, for example such as terrestrial and cable TV broadcasting (40 to 860 MHz). The filter being adapted to a filter tuning modulation signal ( ) having a first frequency (F ) and a second frequency (F ). Values of the output signal ( ) are measured, a first value (S ) at the first frequency, and a second value (S ) at the second frequency, and a comparison signal ( ) is generated in comparing the first value and the second value to adjust filter with the tuning control signal in response to the comparison signal, modulation signal and an approximate filter tuning signal to provide a desired signal at the output signal.

Apparatus and method for tuning a filter

A television vertical timebase circuit includes an arrangement (10, 25, 30, 35, 40, 45) for generating a vertical ramp voltage of first and second slopes corresponding to 4:3 and 16:9 aspect ratios. An arrangement (50,55,65) adds a predetermined voltage to a predetermined portion of the 16:9 ratio ramp voltage such that unwanted visible signals are positioned outside the visible screen area when displaying 16:9 aspect ratio pictures.

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Blagnac, France

John Avis Shepherd