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The ability to provide accurate, rapid and dynamically-controlled impedance matching offers significant advantages to a wide range of present and emerging radio-frequency (RF) power applications. This work develops a new type of tunable impedance matching networks (TMN) that enables a combination of much faster and more accurate impedance matching than is available with conventional techniques. This...
This paper presents a high-efficiency RF powering system, suitable for individual health monitoring applications. The system is composed of an antenna, an impedance matching network, and a two-stage full-wave RF-DC rectifier. A novel tuning mechanism is proposed to automatically adjust the impedance of the matching network. This mechanism can effectively improve the power efficiency of the system...
A high linearity subthreshold mixer with negative impedance generation is presented. The mixer configuration was formed by adding two cross-coupling capacitors to a conventional structure. Since the internal negative impedance generation of this construction cancels parasitic capacitances, the conversion gain loss due to the parasitic capacitances is alleviated and the linearity is improved. Small-signal...
A new, simple and high-accuracy impedance-to-digital converter (IDC) is proposed in this paper. Conventionally, the parameters of sensors that can be modeled using a parallel combination of a capacitor (${C}$ ) and a resistor (${R}$ ) are measured using ac bridges, excited from a sinusoidal source. Recently, with the widespread use of digital systems in instrumentation, capacitance-to-digital converters...
An integrated reconfigurable tuner based on a 4-mm long coplanar waveguide transmission line (CPW) loaded periodically with switched capacitors is demonstrated in a standard 45nm CMOS Silicon on insulator (SOI) technology. The tuner is designed with 10 switchable capacitors controlled by a series-in parallel-out shift register, that allows on-the-fly programming, leading to a large Smith chart coverage...
A Pi-network topology using MIM-cap free digitally NMOS capacitors is demonstrated. Based on a 130 nm Bulk-CMOS process of Infineon Technologies, this circuit contains stacked transistors to vary the capacitance. It also features a direct through mode between ports to draw the minimum insertion losses of 0.36 dB at 824 MHz. The 3 capacitances can be modified from 0.2 pF to 3 pF and show a Maximum...
The present paper provides an introduction to the concepts and hints used to layout PCBs (printed circuit boards) with good SI (signal integrity) and EMI (electromagnetic interference) control when designing RF (radio frequency), analog and digital electronic circuits, within the same PCB. This document also analyses the problem of getting good SI and EMI performance in dense populated PCBs with mixed...
In this paper, RF characterization results of decoupling capacitors embedded in high resistivity silicon (HRS) substrate are reported. First, an innovative 3-D architecture suitable for silicon processes is decribed. Then, RF characterization results are analyzed based on capacitance values as well as ESR (estimated serial resistance) and ESL (estimated serial inductance) extraction. Results clearly...
This paper deals with the concept, the implementation and the verification of an automatic impedance matching circuit for NFC antennas with a frequency of 13.56 MHz. Besides an introduction to manual tuning and its issues, the fundamental components of an automatic tuning system are outlined. A lab-scaled prototype is built and demonstrated. In the end, the successful operation of this system is tested...
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