Rezeq
Moh'D Rezeq, Abu Dhabi AE
Patent application number | Description | Published |
---|---|---|
20130122774 | FABRICATION OF SUPER ION - ELECTRON SOURCE AND NANOPROBE BY LOCAL ELECTRON BOMBARDMENT - Method of fabricating super nano ion-electron source including: placing an assembly of precursor tip and metal ring around the precursor tip below the apex in a FIM chamber; applying dc current from grounded source to the metal ring to heat the ring; gradually applying high voltage to the precursor tip; wherein the metal ring is exposed to a high electric field from the tip, generating Schottky field emission of electrons from the metal ring, the applied electrical field sufficient to cause electrons to be extracted from the metal ring and accelerated to the shank with energy sufficient to dislodge atoms from the shank; and monitoring the evolution of the tip apex due to movement of dislodged atoms from the shank to the apex while adjusting the electrical field, the current or temperature of the metal ring until the apex forms a sharp nanotip with an atomic scale apex. | 05-16-2013 |
20130168641 | NANO METAL PARTICLES BASED TUNNELING FIELD EFFECT TRANSISTOR AND NANO-SWITCH - A new devices structure of nano tunneling field effect transistor based on nano metal particles is introduced. The nano semiconductor device, comprising a source and a drain, wherein each of the source and drain comprise an implanted nano cluster of metal atoms, wherein the implanted nano cluster of metal atoms forming the source has an average radius in the range from about 1 to about 2 nanometers, and the implanted nano cluster of metal atoms forming the drain has an average radius in the range from about 2 to about 4 nanometers. Processes for producing the nano semiconductor device are detailed. | 07-04-2013 |
Sameh Rezeq, Dallas, TX US
Patent application number | Description | Published |
---|---|---|
20090051425 | PREDISTORTION SYSTEM AND METHOD BASED ON LOOK UP TABLE INTERPOLATION - A system comprising a pre-power amplifier and a hardware device which is configured to predistort an amplitude input signal by comparing interpolated data places, determined by comparing the input signal with data from a LUT, coming from a LUT with the amplitude input signal and choosing the closest input data place to the amplitude input signal to produce an amplitude predistortion output signal. The LUT contains predistortion data associated with the pre-power amplifier. The amplitude input signal is multiplied and scaled prior to being compared with the data in the LUT. A second LUT is used to predistort a phase input signal and the phase predistortion output signal is combined in the pre-power amplifier with the amplitude predistortion output signal. The system may be implemented in a mobile communications device. | 02-26-2009 |
20110182382 | DIGITAL AMPLITUDE MODULATION - A transmitter using quadrature modulation includes a rectangular to polar converter for converting data symbols into a polar form, where each polar symbol has a magnitude signal and an angle signal. Digital phase modulation circuitry includes an all digital PLL circuit for generating a phase modulated RF carrier signal responsive to the angle signal frequency control word (FCW) and a carrier frequency FCW. A digitally controlled amplifier for amplifying the phase modulated signal is controlled by a digital amplitude control circuitry for controlling the gain of the digitally controlled amplifier responsive to the magnitude signal. | 07-28-2011 |
20120007687 | Digital Amplitude Modulation - A transmitter using quadrature modulation includes a rectangular to polar converter for converting data symbols into a polar form, where each polar symbol has a magnitude signal and an angle signal. Digital phase modulation circuitry includes an all digital PLL circuit for generating a phase modulated RF carrier signal responsive to the angle signal frequency control word (FCW) and a carrier frequency FCW. A digitally controlled amplifier for amplifying the phase modulated signal is controlled by a digital amplitude control circuitry for controlling the gain of the digitally controlled amplifier responsive to the magnitude signal. | 01-12-2012 |
Sameh S. Rezeq, Dallas, TX US
Patent application number | Description | Published |
---|---|---|
20100105338 | PREDISTORTION METHODS AND APPARATUS FOR TRANSMITTER LINEARIZATION IN A COMMUNICATION TRANSCEIVER - Predistortion methods and apparatus for transmitter linearization in a communication transceiver are disclosed. An example apparatus to linearize a digitally controlled pre-power amplifier included in a transmitter of a communication transceiver disclosed herein comprises a predistorter to predistort an input signal to be processed by the digitally controlled pre-power amplifier, a coupling path within the communication transceiver to couple an output of the digitally controlled pre-power amplifier to an input of a receiver included in the communication transceiver without enabling an output power amplifier stage of a multi-stage power amplifier coupled to an output of the digitally controlled pre-power amplifier, wherein no additional hardware components are required to implement the coupling path within the communication transceiver, and a predistortion evaluator comprising a predistortion calibrator and a predistortion compensator to process data demodulated by the receiver to generate and update predistortion values for use by the predistorter. | 04-29-2010 |
20100135368 | UPSAMPLING/INTERPOLATION AND TIME ALIGNMENT MECHANISM UTILIZING INJECTION OF HIGH FREQUENCY NOISE - A novel and useful apparatus for and method of upsampling/interpolating a discrete-time input sample stream with time alignment utilizing the addition of randomized high frequency noise. The upsampling mechanism is an effective implementation of a second order interpolator that eliminates the need for a conventional filter as the filtering action is effectively built into the mechanism. The upsampling mechanism takes the derivative of the discrete-time input sample stream, thereby effectively providing another order of interpolation over a conventional interpolator. Before outputting the interpolated signal, an integrator takes the integral of the interpolated samples. Any processing performed between the derivative and integrator blocks effectively provides an additional order of interpolation. High frequency noise (i.e. dithering) is added to the differentiated samples in order to eliminate the spectral regrowth spurs that would otherwise appear in the output after rounding. Delay alignment is performed on the differentiated samples in order to time align both phase/frequency and amplitude samples that are processed on different paths. | 06-03-2010 |
20100188148 | PREDISTORTION MECHANISM FOR COMPENSATION OF TRANSISTOR SIZE MISMATCH IN A DIGITAL POWER AMPLIFIER - A novel and useful apparatus for and method of predistortion compensation of device (e.g., transistor) mismatch in a digital power amplifier (DPA). The device mismatch predistortion mechanism of the present invention addresses the problem of matching between two types of binary weighted transistors, whereby mismatched transistors cause degradation in wideband noise. The invention provides a digital predistortion mechanism which functions to pre-distort the mismatch ratio based on a data table calculated a priori enabling a polar transmitter to meet output spectrum and error vector magnitude (EVM) requirements of the particular modern wideband wireless standard, such as GSM, 3G WCDMA, etc. | 07-29-2010 |
20120263256 | LINEARIZATION OF A TRANSMIT AMPLIFIER - An apparatus and method of linearization of a digitally-controlled pre-power amplifier (DPA) and RF power amplifier (PA) for performing predistortion calibration to compensate for nonlinearlities in the DPA and PA circuits. A predistortion look up table (LUT) stores measured distortion compensation data that is applied to the TX data before being input to the digital-to-frequency converter (DFC), DPA and PA. The on-chip receiver, which is normally inactive during the TX burst in a half-duplex operation, demodulates the RF PA output and uses the digital I/Q RX outputs to perform calibration of the TX pre-distortion tables. A sample of the RF output signal is provided to the receiver chain. While the PA (DPA) code is increasing (or decreasing), the amplitude and phase of the recovered I/Q samples are used to determine the instantaneous value of the AM/AM and AM/PM pre-distortion from which an update to the predistortion tables may be computed. | 10-18-2012 |
Sameh Sameer Rezeq, Dallas, TX US
Patent application number | Description | Published |
---|---|---|
20080233898 | System and method for a time alignment analog notch - System and method for creating a time alignment analog notch. An embodiment includes a digital power amplifier coupled to an enable signal line and to a digital control bits bus, and a matching network coupled to the digital power amplifier. The matching network to provide impedance matching and the digital power amplifier to produce a current based on a value on the digital control bits bus. The digital power amplifier comprises a selection circuit and a plurality of transistors. The transistors, controlled by outputs of the selection circuit, provide a current based on the value on the digital control bits bus. The adjustment of a delay between a signal on the enable signal line and the values on the digital control bits bus creates an analog notch at about Fs/2, where Fs is a sampling frequency of a sigma-delta modulator used to modulate data provided to the digital power amplifier. | 09-25-2008 |