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In this work a dynamic biasing circuit for current conveyor (CCII) applications is proposed and discussed with circuitry details. This solution, applied for the first time to current-mode circuits, allows to decrease the steady state power consumption of the considered circuit, minimally affecting its performance. The dynamic biasing solution here conceived is able to sense the input signal providing...
Reconfigurable rectifiers are used in wireless power transfer (WPT) systems to improve its efficiency by adjusting the receiver coil's seen impedance. In this paper we propose a novel series-parallel architecture that allows more conversions ratios than the previously proposed architectures. Therefore, a wider output power range is enabled with better impedance regulation. A three-gain rectifier ×1...
A reconfigurable dual-band radio frequency power amplifier topology (PA) is proposed in this work. The supply bias inductor is shared between two PAs that are designed to operate in two different frequency bands. The primary advantage is significant reduction in silicon area, without compromising on RF performance and power efficiency. To validate the proposed technique, a PA for the LTE cellular...
This paper presents a novel 5.5 V resilient Pulse-Triggered-Level-Shifter (PTLS) with enhanced toggling speed. This PTLS is a based on a cascoded High-Voltage (HV) level-shifters and only uses 3.3 V, near minimum size, CMOS transistors. This HV level-shifter generates both floating and a full-scale output signals and is able to operate under supplies from 2.6 V (down to 1.8 V with strategic contextual...
This paper proposes a new cascode current source circuit that provides high-gain with improved headroom and is suitable for low-voltage amplifiers. The circuit achieves this by modifying a low-voltage cascode gate biasing circuit (“trickle-bias”) such that it amplifies the voltage of the cascode node using a PMOS input folded gain-boost amplifier. The low-voltage current source operates down to 260...
In this paper the design of a very low-voltage current mirror with an enhanced output resistance is presented. The mirror is designed using transistors in weak-inversion region, which allows operating with reduced supply voltage. With the use of multiple feedback loops, parameters such as minimum output voltage and output resistance are kept constant with respect to supply voltage, temperature and...
This paper presents a compact bidirectional current mirror suitable for low voltage applications. The idea is to use complementary transistors in subthreshold which are able to set a reduced bias current through the mirror. The circuit presents a class AB operation with a THD near to 1% at 1MHz. The bandwidth is above 10MHz as shown by simulations using Spectre with 0.5μm CMOS technology parameters.
This paper proposed the design of a switchable dual-band low-noise amplifier (LNA) using Silterra 0.18-μm CMOS technology fabrication process. The LNA utilized the single-ended type with cascode inductively source degeneration topology. This topology is best for simultaneous noise and input matching besides capable of reducing the Miller effect as well as improving on the reverse isolation performance...
This paper shows the multipath frequency compensation in a general purpose operational amplifier. Firstly, it deals with the requirements of a general purpose opamp and introduces the need of the frequency compensation in the current circuits. Then, the rules to integrate multipath in an opamp are developed and the transfer function is presented and compared to the one of the nested miller compensation...
Rectifiers are important energy converters and henceforth crucial building blocks for RFID applications. In the first half of the work, we have presented a design methodology for matching the rectifier input impedance with the antenna to maximize the rectifier power conversion efficiency. The proposed design approach uses the fundamental transconductance (Gm(1)) analysis to estimate the rectifier...
As CMOS technology continues to evolve, the supply voltages are decreasing while at the same time the transistor threshold voltages are remaining relatively constant. Making matters worse, the inherent gain available from the nano-CMOS transistors is dropping. Traditional techniques for achieving high-gain by vertically stacking (i.e. cascoding) transistors becomes less useful in nano-scale CMOS processes...
A current mirror (CM) is reconfigured based on self cascode (SC) arrangement, useful for low voltage (LV) analog and mixed mode circuits. The CM uses 4 MOSFETs, has high input and output swing, operating at plusmn0.5 V supply. Further, a novel CMOS CCII has been revisited and implemented using this CM for sourcing the mirrored current into a high impedance output node. P-spice simulations confirm...
Class D amplifiers are becoming the most feasible solution for embedded audio application. However, distortions due to the non-linear nature of switching stage are the main drawback for this amplifier topology. This paper discusses the design and implementation of high fidelity audio class D using sliding mode control scheme. This design method proves to be a cost effective solution for industrial...
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