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An analysis has been carried out to investigate the heat and mass transfer effects in steady axi-symmetric flow of a polymeric liquid (Maxwell fluid) between two infinite stretching disks in the presence of chemical reaction. Particular attention is to compute similarity solution of the governing nonlinear partial differential equations. The series solution of transformed nonlinear ordinary differential...
This paper reports design of a new uc-planar EBG unit cell. Subsequently, this proposed EBG cell has been used to enhance the performance of microstrip patch antenna and its array operating in ISM band (2.4–2.4835 GHz). The effectiveness of the proposed uc-planar EBG unit cell has been demonstrated by comparing the performance with the conventional mushroom type EBG incorporated in the patch and array...
In this paper, a high frequency balun with a very simple and intuitive impedance matching procedure is presented. Owing to the presence of symmetry in the proposed structure, the even-odd mode analysis is applied which results into closed-form design equations. Since, the proposed design has many variables that can be chosen independently, the design equations are investigated to assess the limitation...
This paper describes a generalized multi-frequency impedance transformer capable of providing concurrent matching at arbitrary number of frequencies. A frequency dependent complex load (FDCL) has been considered but the scheme is applicable for real loads as well. The exact analysis of the proposed design results in closed form equations with many independent free variables to cater to the wide range...
In this paper, an interesting dual-frequency behavior of admittance of two sections transmission-line (TSTL) terminated into a real impedance is reported. Furthermore, it is shown that the Monzon two-section dual-frequency impedance transformer is a special case of the reported technique and can be derived from this property itself. In addition, the discovered property leads to a modified dual-frequency...
The noise induced by variations in power supply adversely effects System-on-chip (SoC) performance and these effects could be understood through modelling and analysis of Power Distribution Network (PDN). This paper presents modelling of PDN by incorporation of BGR and LDO for analyzing the effect of supply induced noise on the PDN performance. The effect of Simultaneous Switching Noise (SSN) resulting...
Process variations have become a major challenge with the advancement in CMOS technologies. The performance of memory sub-systems such as Static Random Access Memory (SRAMs) is heavily dependent on these variations. Also, the VLSI industry requires the SRAM bit cell to qualify in the order of less than 0.1ppb to achieve higher Yield (Y). This paper proposes an efficient qualitative statistical analysis...
The speed of any processor largely depends on the cache memory that it incorporates and the cache memory is predominantly made up of Static Random Access Memory (SRAM) cells. Therefore, with the technology shrinking every year, it is becoming essential to improve its reliability. This paper presents a qualitative analysis of a 6T Static Random Access Memory (SRAM) cell when it has been induced with...
This paper presents a new row decoding architecture implemented in 90nm STM10 triple well CMOS technology for low supply voltage, high speed NOR type Flash memories. The overall design is complemented with a novel stress relaxed high/low or positive/negative level shifter for converting the digital signals operating at 1.2V to higher supply voltages for high voltage applications. The proposed level...
A dual-band matching network using dual-band coupled line based quarter-wave line is presented. The proposed matching network is capable of providing simultaneous match for frequency-dependent complex loads having different values at two arbitrary frequencies to Z0 (here, 50Ω). A very simple step-wise evolution of the transformer is shown and closed form design equations are obtained. It is to be...
In this paper, a novel positive level shifter is designed for high speed interfacing between the digital circuits operating at 1.2V and the memory core circuits operating at high voltages in flash memories. The proposed design is also validated for a wide range of output voltage levels and has been optimized to perform efficiently across the different process corners and temperatures. For the targeted...
In this paper opamp based resistive transducer circuit is proposed. The circuit can be used in resistive sensing wherein both large and small changes in resistance can be sensed and measured. The circuit gives voltage output in direct proportion to the fractional resistance change. Any non-idealities can be taken care of within the circuit without using any extra elements. In addition, the gain of...
This paper presents a linearization approach to extend the dynamic range of diode based power detector. The linearized power is estimated using support vector regression with the regularization parameter estimated directly from the training data. The proposed technique gives 25% better results as compared to previously published results. Comparison of diode power detector characteristics for different...
Characterisation, test and modelling of microwave devices and transistors are becoming the pre-requisite for the utilization in the design of modern wireless power amplifies. This serves dual purpose; on one hand it saves the effort and investment due to the possible anomaly in the expected performance of the design while on the other hand it provides a reliable performance estimation of the transistors...
The paper presents analytical design methodology for realizing dual-band phase offset line using multi-section coupled lines. The circuit is designed to emulate a transmission line of 50 Ω characteristic impedance with two different arbitrary phases at the two frequencies. A prototype has been design at 1960 /3500 MHz that is used in dual-band Doherty power amplifier operating for CDMA and WiMAX applications.
This paper reviews and discusses most common load-pull techniques used in the design of power amplifiers (PAs). It also discusses and elaborates on the specific change in load-pull configuration required in order to make them optimally useful for on-wafer device characterization. Finally, distinct case studies for device characterization and PA design that utilizes a load-pull system is reported.
This paper presents a systematic methodology to design a diode-based RF predistorter that can linearize power amplifiers with dual inflection points in their distortion characteristics. The proposed structure contains an anti-parallel configuration of Schottky diodes, with a PIN diode in parallel, connected to a hybrid using λ/4 transmission lines. The proposed linearizer when applied to a commercial...
This paper presented a general-purpose multiport measurement system and calibration algorithm for the characterizations of N-port microwave devices. The system is built around the micro wave transition analyzer as a multi-harmonic receiver from DC to 40 GHz, which provides the system with the scope capability for time domain measurements and the vector network analyzer capabilities for frequency-domain...
Characterisation of modern wireless power transistors and amplifies requires wideband-modulated stimuli for realistic performance evaluation. Normally power transistor performance is evaluated using passive load-pull techniques. However, these have some physical realization constraints that influence the amplitude and the phase of the presented impedance at the DUT plane as across the modulated bandwidth...
This paper presents a dynamic AM-AM and AM-PM characterization of multiport RF power amplifiers. These measurements have been enabled by the multiport MTA-based measurement setup proposed in this paper. The setup provides simple, accurate, and time saving mechanism for these kinds of dynamic distortion characterizations since it is able to perform the measurements of multiport PAs in a single measurement...
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