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This paper presents a novel architecture for a kilo-ohm to giga-ohm pseudo-resistor (PR), based on transistors operating in subthreshold with a fixed-Vgs configuration. This PR when used in an RC filter has a very low and constant settling time regardless of the programmed pole frequency. The proposed PR takes advantage of bootstrapping to improve its tuning range. By defining a constant VGs for the...
A fully integrated transformer-based tunable impedance-matching network is described. The tuning network independently tunes the real and imaginary parts of the impedance. A test chip implemented in a 40-nm CMOS process achieves the resistive tuning range of one octave, making it suitable for shared Bluetooth/Wi-Fi power amplifier (PA) applications. The main sources of insertion loss are identified,...
Energy harvesting is the process of collecting small amounts of energies and converts them into electric power. Since power consumption of digital device has decreased, the energy harvesting is a good approach. The Fukuoka Institute of Technology is located near two AM radio broadcasting stations. Thus, a considerable electric power can be obtained by the electromagnetic waves radiated from these...
With the rapid increase in the level of industrial automation, computers are widely used in industrial fields of industrial automation, and the design of the master system becomes more and more important. According to the topological structure of passive dynamic harmonic filter, the master system is designed. The touch screen and MCGS configuration software are used by the master system. The tasks...
Passive electrically small antennas have a small radiation resistance and a narrow bandwidth. In this paper, a new type of active antenna is reported in which an active circuit generating a non-Foster impedance is embedded in a metamaterial-inspired small antenna with an inherent sizable radiation resistance. This circuit interacts with the reactive elements of the antenna. The end result is a compact,...
In this paper, a new compact realization of sinusoidal oscillator using modified current backward transcon-ductance amplifier (MCBTA) is reported. The proposed circuit employs a single MCBTA and four passive components including two grounded capacitors. The circuit provides completely de-coupled condition of oscillation (CO) of the frequency of oscillation (FO), i.e. no term in the CO is present in...
A circuit technique to implement a floating inductance simulator using operational transconductance amplifiers (OTAs) is introduced in this paper. The realization method based on the commercially available OTA, one resistor and one capacitor provides the advantage of an electronic adjusting capability. The resulting inductance can be electronically varied by tuning the external bias current of OTA...
A 5th-order Chebyshev active RC complex filter for wireless sensor networks with automatic frequency tuning is presented in this paper. This filter is synthesized from 5th-order low-pass LC prototype, and designed using leapfrog structure. An automatic frequency tuning is used to prevent the deviation of the RC constant of the filter. This filter is fabricated in TSMC 0.18μm CMOS process. The measurement...
In a previous paper the authors proved that a large class of switched power converters can be globally asymptotically stabilized with a simple linear proportional-integral (PI) controller around a suitably defined output. An explicit formula to construct the desired output, which is a linear combination of the converter states, is also given. Moreover, if the load resistance is unknown, an adaptation...
A miniaturized planar antenna based on a broadside-coupled split ring resonator excited by an arc-shaped dipole is presented. The excitation dipole acts as a small tuning capacitor in series with a parallel RLC circuit represented by the SRR. The antenna resonance frequency and dimensions a essentially determined by the SRR, while by varying the dipole arm length the input resistance is changed in...
The next generation of wireless communication is a ubiquitous radio system concept, providing wireless access from short-range to wide-area, with one single reconfigurable and adaptive system for all envisaged radio environments. This paper presents the design approach of RCO (reconfigurable concurrent oscillator) that simultaneously generates two or more signals of different frequencies that eliminate...
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