scholarly journals A wideband blocker-resilient RF front-end with selective input-impedance matching for direct-ΔΣ-receiver architectures

2016 ◽  
Author(s):  
Faizan Ul Haq ◽  
Mikko Englund ◽  
Kari Stadius ◽  
Marko Kosunen ◽  
Jussi Ryynanen ◽  
...  
Keyword(s):  
Input Impedance ◽  
Impedance Matching ◽  
Front End ◽  
Rf Front End ◽  
Input Impedance Matching

scholarly journals Optimum power transfer in RF front end systems using adaptive impedance matching technique

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Mohammad Alibakhshikenari ◽  
Bal S. Virdee ◽  
Leyre Azpilicueta ◽  
Chan H. See ◽  
Raed Abd-Alhameed ◽  
...  
Keyword(s):  
Impedance Matching ◽  
Adaptive Antenna ◽  
Power Transfer ◽  
Control Loops ◽  
Matching Networks ◽  
Front End ◽  
Rf Front End ◽  
Matching Technique ◽  
Digital Circuitry ◽  
Communications System

AbstractMatching the antenna’s impedance to the RF-front-end of a wireless communications system is challenging as the impedance varies with its surround environment. Autonomously matching the antenna to the RF-front-end is therefore essential to optimize power transfer and thereby maintain the antenna’s radiation efficiency. This paper presents a theoretical technique for automatically tuning an LC impedance matching network that compensates antenna mismatch presented to the RF-front-end. The proposed technique converges to a matching point without the need of complex mathematical modelling of the system comprising of non-linear control elements. Digital circuitry is used to implement the required matching circuit. Reliable convergence is achieved within the tuning range of the LC-network using control-loops that can independently control the LC impedance. An algorithm based on the proposed technique was used to verify its effectiveness with various antenna loads. Mismatch error of the technique is less than 0.2%. The technique enables speedy convergence (< 5 µs) and is highly accurate for autonomous adaptive antenna matching networks.

Tunable impedance matching network with wide impedance coverage for multi frequency standards RF front-end

2017 ◽  
Vol 82 ◽  
pp. 74-82 ◽  
Author(s):  
Yan Chiew Wong ◽  
Ranjit Singh Sarban Singh ◽  
Syafeeza Binti Ahmad Radzi ◽  
Norihan Binti Abdul Hamid
Keyword(s):  
Impedance Matching ◽  
Matching Network ◽  
Frequency Standards ◽  
Front End ◽  
Rf Front End ◽  
Tunable Impedance

scholarly journals A wideband blocker-resilient direct delta sigma receiver with selective input-impedance matching

2020 ◽  
Vol 103 (1) ◽  
pp. 195-207
Author(s):  
Faizan Ul Haq ◽  
Mikko Englund ◽  
Kim B. Östman ◽  
Kari Stadius ◽  
Marko Kosunen ◽  
...  
Keyword(s):  
Input Impedance ◽  
Impedance Matching ◽  
Delta Sigma ◽  
Input Impedance Matching
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