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This paper proposes on-chip soft-start method with minimum extra components and turbulence free start up of dc-dc converter. During the soft start, the output voltage is slowly increased to the steady state value so that the inrush current and overshoots are prevented. The proposed topology is implemented in buck converter designed to give 3.3V output for wide supply range of 4.5V to 18V and load...
In this paper, we have exploited the novel hybrid-cum-improved spectrum access strategy to significant improvement in the throughput and data-loss rate. This proposed strategy is comprise of hybrid spectrum access and improved frame structure strategies for the cognitive radio communication system. In addition to this, the mathematical expressions of throughput for these approaches are also presented...
This paper proposes a novel method for ripple cancellation in multi-phase converters. Unlike the conventional multi-phase converter, the proposed topology can cancel the ripple irrespective of the duty ratios. The proposed topology is designed to give 3.3V output for wide supply range of 4.5 to 18V and load range of 0 to 3A in AMS 0.35um high-voltage CMOS process. Transistor level simulation results...
Design of a ripple free switching mode power converter is a challenging task in power electronics industry. The conventional method for ripple reduction is to use passive filters, which makes the system bulky. Hybrid structured converters are introduced to reduce the ripple without using bulky output capacitors. In this type of converters, to cancel the ripple, opposite current / voltage of the ripple...
This paper proposes an improved charge pump circuit for low voltage RFID applications. The architecture of charge transfer switch based dynamic charge pump has been modified to provide higher output voltage than existing one. This has been achieved by replacing the diode with a charge transfer block at the last stage of the dynamic CTS charge pump. The modified charge pump eliminates the threshold...
Established RF CMOS switch contains MOSFET in its main architecture with a 5.0 V of control voltage and required high value of resistance in circuitry of transceivers to detect the signal. To avoid the high value of control voltage and those resistances, we proposed a Double-Pole Four-Throw switch using RF CMOS technology and verified its performance interns of currents and switching speed. Also to...
In this paper, we have designed a Double-Pole Four-Throw (DP4T) RF CMOS switch, using Double-Gate (DG) MOSFET which has a high dielectric Hafnium-dioxide (HfO2) in place of Silicon-dioxide (SiO2). The performance of HfO2 for the switch such as an effective ON-resistance, attenuation, flat-band capacitance, average dynamic power, doping densities, Debye length, and mobility of carriers, barrier heights...
To avoid the uses of multiple RF chain associated with the multiple antennas, RF switch is most essential component. Multiple antennas systems are used to replace traditional single antennas circuitry in the radio transceiver system in order to improve the transmission capability and reliability. The desired switching system must have low cost and simple structure, yet still can capture all the advantage...
This paper presents an overview of self-imaging principle used in MMI couplers and also explains the application of multimode waveguide as an optical switch. The application of MMI coupler to realize a 2times2 optical switch has been explained by varying the refractive indices of various regions of MMI section by only 1-2% and the switch is found to exhibit 2-10% loss for various coupling states at...
Authors have in previous publications demonstrated the generation of SUM and DIFFERENCE patterns in a programmable phased array consisting of time-delay units. In this paper a few applications of such programmable phased array are highlighted. Delay-line cancellation method is revisited and it is shown that blind speed can be eliminated. Similarly some adaptive beam formation and interference rejection...
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