Zebra Technologies Corporation

Motorola Corporation

Motorola Solutions, Inc.

John Janos Bozeki

Paul H Gailus

Manuel P Gabato

Robert E Beach

Richard Mark Clayton

Patrick Martin Brown

Chinmay Nanda

Joseph A Charaska

Paul Seiter

Thomas William Judd

Lucjan K Perlowski

Michael H Baker

Mark Rozental

David H Minasi

Armando J Gonzalez

Joshua E Dorevitch

Vadim Dubov

A label modification unit may receive a label modification input that indicates a label modification associated with content being written to a label or erased from the label. The label modification unit may identify an area of the label that is associated with the label modification according to the label modification input. The label modification unit may determine, based on a size of the area, a spot size of a light beam that is configured to be emitted by a laser printhead to modify the content within the area. The label modification unit may determine, based on the spot size and the content, an optical path configuration for the laser printhead. The label modification unit may operate the laser printhead according to the optical path configuration to write the content to the area or erase the content from the area.

Control of laser printhead for writing or erasing content

A label modification unit may receive a label modification input associated with an image. The label modification unit may process, using an image filtering, the label modification input to convert the image to a bitmap for raster printing the image via a laser printhead. The label modification unit may determine, based on the bitmap, an array of power factors for a light beam that is configured to be emitted by a laser of the laser printhead and raster print the image. The label modification unit may control the laser of the laser printhead in association with raster printing the image on a rewriteable label according to the array of power factors.

Laser printhead raster path configuration for modifying a rewriteable label

A label modification unit may receive a label modification input associated with an image. The label modification unit may obtain a bitmap associated with a modification to the rewriteable label. The label modification unit may determine, based on the bitmap and using a heat dissipation model, temperature profiles for a plurality of raster print paths of the laser. The label modification unit may select, based on the temperature profiles and from the plurality of raster print paths, a raster print path for the modification. The label modification unit may control at least one of the laser, the optic, and the reflector system to: cause the light beam to follow the raster print path, and emit the light beam according to an array of power factors that are associated with the raster print path.

A frequency synthesizer includes: a frequency source generating a reference signal that includes a plurality of pulses having periodicity based on a reference frequency; a feedback loop that includes, a phase detector circuit, a loop filter, a controlled oscillator that generates an output signal at an output, and a loop divide circuit; a non-linear circuit element at an input of the phase detector circuit, which generates intermodulation distortion that causes at least one spurious signal at the output; and a controller controlling the loop divide circuit and the non-linear circuit element. The frequency synthesizer further includes a dither circuit that adjusts the timing of some of the pulses of the reference signal based on a parameter provided by the controller to the non-linear circuit element, thereby, providing a jittered reference signal to the non-linear circuit element for attenuating the at least one spurious signal at the output.

Method and apparatus for spur reduction in a frequency synthesizer

A method and apparatus for reducing in-band spurs in a fractional-N synthesizer () includes generating a compensated current signal by a charge pump () coupled to a phase detector (). The compensated current signal includes in-band spurs having frequencies within a frequency bandwidth associated with a loop filter (). The method then includes selectively dithering the compensated current signal with a sufficient dither level to spread the frequencies of in-band spurs beyond the frequency bandwidth associated with the loop filter (). The dithered compensated current signal is then passed through the loop filter () for filtering the in-band spurs having frequencies beyond the frequency bandwidth. The method then includes generating a voltage controlled oscillator (VCO) signal with reduced in-band spurs proportional to the filtered compensated current signal.

Method and apparatus for reducing spurs in a fractional-N synthesizer

A system and method for performing baseband phase shifting in a Cartesian feedback system includes a forward path for receiving an input baseband signal having two components, and performing up-conversion to output a RF signal; a power amplifier for amplifying the RF signal output from the forward path; and a feedback path for down-converting at least a sample of the output from the power amplifier to a feedback baseband signal comprising two components, and providing the feedback baseband signal to the forward path in order to be summed with the input baseband signal at a summing junction and before the loop filter. The forward path includes a baseband phase shifter for adjusting the baseband signal output from the summing junction in order to compensate for any phase shifts induced in the system.

System and method for performing baseband phase shifting in a Cartesian feedback system

An isolator eliminator for a linear transmitter receives a plurality of digital samples of an information signal and a drive signal sampled from a feedback loop at periodic time intervals and, responsive to processing the digital samples, provides high accuracy phase and level correction signals to the feedback loop. The phase and level correction signals maintain stable, linear operation of the feedback loop and limit splatter. In a preferred embodiment, the isolator eliminator includes a digital signal processor such that multiple communication protocols may be accommodated by changing software code executed by the processor.

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Elgin, IL, United States of America

John Janos Bozeki