Mohamed Balla Elamien

McMaster University | McMaster

In this work, we explore the behavior of a classical RLC resonance-based bandpass filter, which includes two resistors (one of which is associated with a non-ideal inductor), when either of these resistors is self voltage-controlled. In particular, self-feedback control is achieved by using the voltage developed across the inductor or the capacitor...

We derive closed form expressions for the impedance of two-dimensional (2-D) infinite ladder-tree and tree-ladder networks using the combination of results for the input impedance of an infinite 1-D ladder network and an infinite 1-D tree network. We show that the effect of the number of branches in the tree network can always be absorbed via imped...

We propose a class of fully differential filters based on a common-gate differential amplifier cell in three different topologies. Our focus is on the synthesis of second-order band-pass filters and we found 53 possible circuits. All filters are resonance-based and have electronically tunable gain. Post layout simulations in 65-nm CMOS technology a...

In this paper, we report on the design of a class of analog filters based on the cascode circuit structure surrounded by four impedances. The proposed topology is systematically investigated using two-port network techniques and symbolic math CAD tools. A total of 106 second-order filter circuits can be obtained from this class including 9 low-pass...

In this paper, a synthesis methodology for analog circuit design is presented. This methodology utilizes symbolic math tools to systematically and exhaustively search for candidate analog circuits avoiding tedious manual work. The two-port network matrix representation of active devices, such as MOS transistors, paves the way for efficiently using...

Measuring phase noise in oscillators is crucial in communication systems, vibration analysis, and frequency synthesizers. Traditionally, this measurement is done in frequency domain by estimating the ratio of the power density at an offset frequency from the carrier to the power of the carrier signal. This approach is hardware intensive and depende...

A CMOS wideband voltage-mode fully differential all-pass filter (APF) is discussed. The APF circuit consists of three transistors, two inductors, two capacitors, and four resistors. The proposed APF employs the generic two-transistor common-source amplifier structure. Design procedures along with parasitic analysis are presented for wideband applic...

We propose a second-order RC-only voltage-mode active all-pass filter (APF) as an analog time-delay cell. The core circuit of the proposed APF is canonical and consists of only one transistor, one resistor, and two capacitors. Therefore, this design is area efficient, and it is suitable for low-GHz frequency applications, where conventional LC desi...

A novel first-order voltage-mode all-pass filter is introduced as a true-time delay (TTD) cell with tunable delay capability. The proposed filter consists of a single transistor, a varactor, and four resistors. The operation of the proposed filter is verified by post-layout simulations in 65-nm CMOS technology. The post-layout simulation results of...

This work proposes a new third-order wide-band all-pass filter (APF) circuit as a true time delay (TTD) element. The proposed APF is a voltage-mode circuit which only includes one transistor, one inductor, two resistors, and two capacitors. Post-layout simulation results in 65-nm CMOS process are used to validate the performance of the proposed cir...

In this article, all possible wideband fully differential second-order voltage-mode active all-pass filters (APFs) based on a common-source differential amplifier are systematically derived using two-port network modeling techniques and symbolic math CAD tools. The proposed APF structure is based on the generic two-transistor differential-pair and...

In this paper, we present a quadrature-phase oscillator that can provide four output voltages while operating from a single 0.5V supply. The oscillator is based on two cross-coupled modified differential pair cells and provides signals with a phase difference of ±180° or ±90° depending on the chosen output nodes. A test chip with an active area of...

In this letter, a third‐order wideband voltage‐mode all‐pass filter (APF) is proposed for application as a true time delay (TTD) cell. The advantages of designing a single‐stage higher order filter over cascading several lower order stages are illustrated. The proposed APF circuit is based on a single metal‐oxide‐semiconductor (MOS) transistor and...

In this paper, a CMOS wide-band low-power second-order voltage-mode allpass filter design is proposed as a true time delay element. The proposed allpass filter core design consists of a single transistor, three resistors, one capacitor and one inductor. As a time delay element, the proposed circuit exhibits a group delay of 34 ps within a bandwidth...

This paper presents two CMOS designs of a second-order voltage-mode allpass filters (APFs) for high-frequency applications. Each of the proposed filters is based only on a single transistor and four surrounding impedances. The first proposed allpass filter is an RL filter while the second proposed one is an RLC filter. A detailed analysis along wit...

In this paper, we propose a MOS design of a second-order voltage-mode allpass filter to be used as a time delay cell. The proposed filter is based on a single transistor, three resistors and two energy storage elements and was designed in a 65nm CMOS technology. Post-layout simulations demonstrate a group delay of approximately 13ps across a 30GHz...

In this paper, we propose a digital programmable OTA-based multi-standard receiver for analog baseband chain. It consists of a switchable-order low-pass filter and two programmable gain amplifiers (PGAs). The low-pass filter has a cutoff frequency that can be digitally tuned from 1 MHz to 10.2 MHz. Thus, it covers Bluetooth, UMTS, DVB-H and IEEE 80...

This paper proposes a novel highly linear digitally programmable fully differential operational transconductance amplifier (DPOTA) circuit. Two versions of the proposed DPOTA structure are designed. The first version is optimized for high-frequency operation with current division networks designated to 3-bit control code words. On the other hand, t...

A new class of differential oscillators comprising ten possible circuits is introduced in this work. Half of the members of this family are LC-based oscillators and the other half are RC-based ones. While all oscillators are second-order, a maximum of four resistors was imposed as a restriction on possible oscillators that belong to the proposed ar...

In this paper, we present a fully differential band-pass filter design topology. It is based on the generic two transistor differential pair, common-drain structure and three surrounding impedances Z1, Z2 and ZL. Ten selected samples of possible bandpass filters based on various choices of Z1,2,L are also presented. Selected designs with Q-tunable...

The original version of this article unfortunately contained a mistake. The co-authors’ affiliation details were incorrect in the original publication of this article. © 2018 Springer Science+Business Media, LLC, part of Springer Nature

This study presents a wide tunable Gm-C low-pass filter for biomedical and wireless applications. The proposed filter was designed using the standard 90 nm complementary metal-oxide-semiconductor technology operating with a balanced supply voltage of 1.2 V. Modified linearisation techniques are used to improve the linearity of the digital programma...

In this paper, a third-order elliptic lowpass filter is designed using highly linear digital programmable balanced OTA. The filter exhibits a cutoff frequency tuning range from 2.2 MHz to 7.1 MHz, thus, it covers W-CDMA, UMTS, and DVB-H standards. The programmability concept in the filter is achieved by using digitally programmable operational tran...

We propose a four quadrant six transistor current multiplier cell based on the translinear principle. The cell is further modified by using resistive feedback to remove two PNP transistors hence reducing the total transistor count to four NPN transistors only. This not only eliminates the problem of mismatch between the two transistor types but all...

A fully differential Gm-C low pass filter for wireless and biomedical applications is introduced in this letter. The proposed filter is based on a highly linear CMOS digital programmable operational transconductance amplifier (DPOTA).The filter consists of a parallel connection of three 4th-order Butterworth sections. Each section is optimized for...

This paper presents the analysis and design of a new CMOS highly linear digitally programmable operational transconductance amplifier (DPOTA). The proposed DPOTA is used to design a fourth-order low pass filter for a portable Electroencephalogram (EEG), Electrocardiogram (ECG) and Electromyography (EMG) detection systems. The performance of the pro...

Sinusoidal oscillators with new attractive features continue to be introduced in the literature. For example, [2] introduced structures where the required start-up gain decreases as the oscillation frequency increases providing power saving at higher frequencies. Meanwhile quadrature and multi-phase oscillators are of significant importance for man...

In this paper, a third-order elliptic lowpass �lter is designed using highly linear digital programmable balanced OTA. The �lter exhibits a cuto� frequency tuning range from 2.2 MHz to 7.1 MHz, thus, it covers W-CDMA, UMTS, and DVB-H standards. The programmability concept in the �lter is achieved by using digitally programmable operational transcon...

In this paper, a digital programmable balanced OTA is proposed. The proposed OTA employs three linearization techniques which are the source degeneration, double differential pair and the adaptive biasing. The programmability concept is achieved by using two current division networks (CDNs). The third-order harmonic distortion (HD3) remains below -...

A nonlinear transconductor with quadratic-type nonlinearity is designed and experimentally verified in this Letter. The inherent nonlinearity of a single NMOS transistor is used to obtain this transconductor with extra biasing circuitry that enables the re-configuration of the drain-to-source voltage VDS and the gate-to-source voltage VGS such that...

In this paper, a digital programmable balanced OTA is proposed. The OTA employs three linearization techniques which are the source degeneration, double differential pair technique and the adaptive biasing. The digital programmability is achieved by using two current division networks (CDNs). The third-order harmonic distortion (HD3) remains below...

This paper presents two new configurations for linear CMOS balanced output transconductor. The proposed circuits employ three types of linearization techniques which are previously reported in the literature. The three techniques are the source degeneration, double differential pair technique and the adaptive biasing. The second proposed configurat...

Biomedical signals are essential to physicians for diagnosing medical conditions in patients. Usually, electrodes are used to acquire the biomedical signals from human body and then the amplifiers are used to amplify these signals in order to be suitable for analog-to-digital conversion. However, the main challenge in this process is the patient is...