China
Africa
Explore chapters and articles related to this topic
Distributed Effects and Coupling in RF Integrated Circuits
Published in Krzysztof Iniewski, Wireless Technologies, 2017
A particular application of the artificial transmission line is the distributed amplifier (DA), where such lines are used at both the input and the output. With an artificial transmission line, series inductors (which can be realized with transmission lines or with spiral inductors) and parallel capacitors are used to build a model for a transmission line. Then the parallel capacitors and the parasitic capacitance associated with gain blocks can be incorporated as part of the artificial line as shown in Figure 19.12. Each gain block is shown as a single MOS transistor in the common-source configuration, but gain blocks can be realized in many different ways, for example, with cascode structures or Darlington pairs, and in different technologies, for example, with bipolar or MESFET transistors. The important thing is that the input and output capacitance is absorbed by the required parallel capacitance of input and output artificial transmission line. Since the gate capacitance CG is typically significantly higher than the drain capacitance CD, an additional capacitance Cadd has been shown connected at the drain. The block labeled as “Match” may contain matching components, coupling capacitors, and biasing circuits. The drain line is typically biased at the positive power supply whereas the gate line is appropriately based to provide the correct VGS bias for the transistors.
Analysis and implementation of compact two-section half-wave balun using artificial transmission lines
Published in Electromagnetics, 2019
To miniaturize conventional transmission lines, various techniques have been reported. In recent years, a kind of planar artificial transmission line was proposed (Wang, Ma, and Yang 2007a), and the design methodology has been presented in details in reference Wang, Ma, and Yang (2007a) and Wang, Ma, and Yang (2007b). A section of artificial transmission line is composed of microstrip structures of interdigital capacitors, meandered-line inductors, and parallel-plate capacitors. The layout and equivalent circuit of a section of artificial transmission line are shown in Figure 8, respectively.