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Electronics, Volume 9, Issue 10

October 2020 - 192 articles

Cover Story: This paper presents a methodology to design a wideband radio frequency variable gain amplifier (RF–VGA) in a low-cost SiGe BiCMOS 0.35 µm process. The circuit uses two amplifiers based on second-generation controlled current conveyors (CCCII). The main feature of this circuit is its wideband input match with a reduced NF (5.5–9.6 dB), without passive elements and, to the authors' knowledge, the lowest die footprint reported (62x44 µm2). Due to the nature of the circuit, when the gain is increased the power consumption is reduced. The architecture is suitable for designing wideband, low-power, and low-noise amplifiers. The design achieves a tunable gain of 6.7–18 dB and power consumption of 1.7 mA with a ±1.5 V DC supply. At maximum gain, the proposed RF-VGA covers from DC up to 1 GHz. View this paper
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Articles (192)

  • Article
  • Open Access
32 Citations
4,380 Views
24 Pages

Genetic Algorithm-Based Tuning of Backstepping Controller for a Quadrotor-Type Unmanned Aerial Vehicle

  • Omar Rodríguez-Abreo,
  • Juan Manuel Garcia-Guendulain,
  • Rodrigo Hernández-Alvarado,
  • Alejandro Flores Rangel and
  • Carlos Fuentes-Silva

21 October 2020

Backstepping is a control technique based on Lyapunov’s theory that has been successfully implemented in the control of motors and robots by several nonlinear methods. However, there are no standardized methods for tuning control gains (unlike...

  • Feature Paper
  • Article
  • Open Access
12 Citations
5,111 Views
21 Pages

Multilevel Simulation Methodology for FMECA Study Applied to a Complex Cyber-Physical System

  • Davide Piumatti,
  • Jacopo Sini,
  • Stefano Borlo,
  • Matteo Sonza Reorda,
  • Radu Bojoi and
  • Massimo Violante

21 October 2020

Complex systems are composed of numerous interconnected subsystems, each designed to perform specific functions. The different subsystems use many technological items that work together, as for the case of cyber-physical systems. Typically, a cyber-p...

  • Article
  • Open Access
13 Citations
6,430 Views
17 Pages

21 October 2020

With the increasing importance of power accumulator batteries in electric vehicles, the accurate characteristics of power accumulator batteries have an important role. In order to evaluate the power accumulator battery, battery charging and dischargi...

  • Article
  • Open Access
4 Citations
2,851 Views
15 Pages

21 October 2020

To give full play to battery capability, the state of power (SoP) should be predicted in real time to inform the vehicle control unit (VCU) whether the upcoming driving scenarios of acceleration overtaking, ramp climbing, constant cruising and feedba...

  • Article
  • Open Access
13 Citations
3,653 Views
23 Pages

An Efficient Hardware Architecture with Adjustable Precision and Extensible Range to Implement Sigmoid and Tanh Functions

  • Hui Chen,
  • Lin Jiang,
  • Heping Yang,
  • Zhonghai Lu,
  • Yuxiang Fu,
  • Li Li and
  • Zongguang Yu

21 October 2020

The efficient and precise hardware implementations of tanh and sigmoid functions play an important role in various neural network algorithms. Different applications have different requirements for accuracy. However, it is difficult for traditional me...

  • Article
  • Open Access
30 Citations
3,348 Views
15 Pages

An Approach for Optimal Coordination of Over-Current Relays in Microgrids with Distributed Generation

  • Sergio D. Saldarriaga-Zuluaga,
  • Jesús M. López-Lezama and
  • Nicolás Muñoz-Galeano

21 October 2020

The ever increasing presence of renewable distributed generation (DG) in microgrids is imposing new challenges in protection coordination. The high penetration of renewable DG enables microgrids to operate under different topologies, giving rise to b...

  • Article
  • Open Access
4 Citations
3,861 Views
23 Pages

21 October 2020

This paper proposes a novel non-isolated three-port bidirectional dc/dc converter for photovoltaic (PV) electric scooter (ES) charging stations. The proposed converter combines an improved boost converter and a bidirectional buck-boost converter. Whe...

  • Article
  • Open Access
11 Citations
5,052 Views
18 Pages

Episodic Self-Imitation Learning with Hindsight

  • Tianhong Dai,
  • Hengyan Liu and
  • Anil Anthony Bharath

21 October 2020

Episodic self-imitation learning, a novel self-imitation algorithm with a trajectory selection module and an adaptive loss function, is proposed to speed up reinforcement learning. Compared to the original self-imitation learning algorithm, which sam...

  • Article
  • Open Access
18 Citations
3,456 Views
12 Pages

21 October 2020

Orthogonal frequency division multiplexing-based non-orthogonal multiple access (OFDM-NOMA) is a competitive solution to achieve a capacity gain over orthogonal frequency division multiplexing-based orthogonal multiple access (OFDM-OMA). However, a m...

  • Article
  • Open Access
36 Citations
4,068 Views
21 Pages

An Active and Passive Hybrid Battery Equalization Strategy Used in Group and between Groups

  • Mingyu Gao,
  • Jifeng Qu,
  • Hao Lan,
  • Qixing Wu,
  • Huipin Lin,
  • Zhekang Dong and
  • Weizhong Zhang

21 October 2020

Active battery equalization and passive battery equalization are two important methods which can solve the inconsistency of battery cells in lithium battery groups. In this paper, a new hybrid battery equalization strategy combinfigureing the active...

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Electronics - ISSN 2079-9292