Feature: Automotive system design
USEFUL TOOLS FOR SELECTING BIAS-T INDUCTORS
Designing and characterising a bias-T circuit can be complex, particularly when balancing electrical performance against size and system constraints. To streamline the process, Murata offers two free online tools.
The first is the Bias-T inductor design support tool (Figure 5, left), which enables designers to input parameters such as DC current, ambient temperature and cable characteristics, to generate a complete bias-T configuration. The tool automatically recommends inductors along with appropriate resistors and capacitors, and provides simulated performance plots, including S-parameters and impedance curves, for deeper insight into circuit behaviour.
Figure 6: The inductor selection tool enables fast evaluation of inductor performance for a wide range of applications
In addition to simulating the bias-T circuit, drop-down menus allow to select specific reference criteria for calculations, including different communication protocols and cable parameters. An option to account for stray capacitances is also included for enhanced understanding of real-world performance.
For more general exploration, Murata’s inductor selection tool (Figure 6, above) features a part number search function and the ability to filter by application, electrical characteristics and size. Once a selection has been made, the user can simulate the frequency characteristics of the inductor, as well as S-parameters for series and shunt configurations. This eliminates time spent combing through datasheets and product pages to find suitable components.
PoC inductor for infotainment applications Infotainment systems typically operate at high data rates but draw relatively little power. T e LQW21FT2R0M0HL (Figure 4) is a compact solution tailored for infotainment applications. With a 2µH inductance and a self-resonant frequency of 230MHz, it provides eff ective signal blocking in the frequency range commonly used by audio, high-speed video and navigation data streams.
T e inductor is rated for 400mA,
making it suitable for lower-power endpoints such as infotainment displays and multimedia control modules. It is housed in an 0805 package, measuring just 2.0mm × 1.2mm × 1.8mm, making it suitable board applications where space is limited.
Challenge, simplifi ed! T e challenge of designing a complex bias-T circuit for PoC can be
signifi cantly simplifi ed by using Murata’s wide-bandwidth inductors, each of which can replace a circuit that previously required multiple components, enabling space savings and greater system stability. By providing a family of application- specifi c inductors and powerful online design tools, Murata removes signifi cant barriers, making it easier for engineers to develop and adopt PoC technology.
www.electronicsworld.co.uk October 2025 21
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