Ahmed Hussien Khalil

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In this paper, the operation of super-regenerative (SR) receivers based on super-regenerative oscillators (SRO) is extended to enable the detection of QPSK modulated signals rather than traditional implementation of SR receivers to detect OOK signals. The ability of super-regenerative receivers to properly detect QPSK modulated signals enables using the(More)
Analog to Digital converters are some of the most commonly used mixed-signal circuits nowadays. Testing such circuits has recently become extremely important. In this paper, a low-cost test is developed for a one-stage Pipelined Analog-to-Digital Converter (PADC). This circuit consists of one operational amplifier, one comparator, five transmission gates(More)
Pipelined Analog-to-Digital Converters (PADCs) are one of the main building blocks in communication systems. It is of big interest to find a simple low cost test for the PADC. The purpose of this paper is to find a simple low cost DC test for an N-stage PADC without the need of complex additional circuitry. In order to reach this objective, a new testing(More)
A highly linear fully differential CMOS transconductor architecture based on flipped voltage follower (FVF) is proposed. The linearity of the proposed architecture is improved by mobility reduction compensation technique. The simulated total harmonic distortion (THD) of the proposed transconductor with 0.4Vpp differential input is improved from 42 dB to 55(More)
In this paper we present an offset cancellation technique for a comparator used in SAR (successive approximation register) analog to digital converter improving the signal to noise ratio of the whole system with minimum power consumption at the expense of complexity of the system. An 8-bit SAR ADC is presented with power consumption 22nW, ENOB = 7.051 and(More)
This paper investigates memristor based demodulators and proposes new circuit designs for Binary Frequency Shift Keying (BFSK) and circular 8-Quadrature Amplitude Modulation (QAM) demodulators using two memristors at most. The proposed designs consider utilizing the unique features of the memristor element, crucially, its variable average memristance with(More)
Nowadays, Analog to Digital Converters (ADCs) play an important role in many applications. Pipelined Analog-to-Digital Converters (PADCs) are extremely useful in high-speed applications. Testing PADC circuits became essential. In this paper, a low-cost test is developed for a one stage PADC. It is shown that only three DC test values are capable to detect(More)
Three new Genetic Algorithm (GA) approaches and four new Particle Swarm Optimization (PSO) approaches are proposed and used to solve a Curve fitting problem for Parasitic Extraction Macro-modeling application. For GA, the first proposed approach, Diagonal GA (DGA); is based on replacing the traditional random population initialization method with a(More)