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Electronics 2018, 7(9), 188; https://doi.org/10.3390/electronics7090188

A Methodology Improving Off-Chip, Lumped RF Impedance Matching Network Response Accuracy

1
Department of Computer Science and Communications Technologies, Vilnius Gediminas Technical University, 10221 Vilnius, Lithuania
2
Micro and Nanoelectronics Systems Design and Research Laboratory, Vilnius Gediminas Technical University, 10257 Vilnius, Lithuania
*
Author to whom correspondence should be addressed.
Received: 2 August 2018 / Revised: 1 September 2018 / Accepted: 8 September 2018 / Published: 10 September 2018
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Abstract

Impedance matching is concurrent with any radio frequency (RF) circuit design and is essential for maximizing the gain and efficiency while minimizing the noise of high-frequency amplifiers as well as some mixer topologies. The main impedance matching network components are capacitors, inductors, and RF transformers all of which contain parasitic parameters that influence the matching response S11 curve. After calculating matching network component values using classical matching techniques, the measured and simulated response curves differ depending on the target frequency. This results in multiple calculations and measurement cycles in order to precisely match the source and load at the desired frequency. This article proposes an algorithm and methodology of estimating component parasitic parameters and taking them into account when calculating the main component parameters (capacitance and inductance). The proposed algorithm has been implemented as a toolbox in Cadence Virtuoso and verified through simulation and measurements. Measurement results show, that at 500 MHz 10% tolerance components with parasitics included and values based on classical theory provide a 3.2–9.8% offset from the target frequency. In the same conditions, matching networks with compensated (according to the proposed algorithm) values provide 0.1–8.8% target frequency offset. At 1500 MHz 10% components provided 4–12.3% (non-compensated) and 1–8.7% (compensated) target frequency offset ranges. At 3000 MHz. The frequency offset range of using compensated matching network component values is reduced from 5.5–15.1% to 1.3–8.1%. View Full-Text
Keywords: algorithm; Cadence; impedance matching; lumped components; OCEAN; RF circuits; SKILL; Virtuoso algorithm; Cadence; impedance matching; lumped components; OCEAN; RF circuits; SKILL; Virtuoso
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Vasjanov, A.; Barzdenas, V. A Methodology Improving Off-Chip, Lumped RF Impedance Matching Network Response Accuracy. Electronics 2018, 7, 188.

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