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Vol 50, No 25, 04 December 2014

  • The vertical inductor's structure allows for double the inductance per unit area, which reduces chip size and increases bandwidth

    Spiralling up to control

    Vertical inductors reduce chip area and increase the bandwidth of broadband amplifiers by 25%
  • Dr Leandros Maglaras

    Dr Leandros Maglaras

    “The development of integrated detection mechanisms that combine several technologies and can adapt to the status of the system are challenges that must be met in the next few years”
  • The WF-LED is capable of producing over 150W of output light

    A bright future for LEDs

    A 150W output LED chip could be the first step to a very different lighting infrastructure, as well as making LEDs more cost effective for current high-power lighting applications

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Amplified potential

Research from the US presents a fully-integrated low-power and area-efficient bio-potential amplifier for high-density neural recording applications. The amplifier can be applied to a body sensor network to monitor patients' biomedical parameters and is a step towards a 512 channel neural recording system that may be used to monitor epilepsy patients.

Testing their metal

In work from the UK, researchers have investigated and characterised the effect of temperature and the different types of metal used on THz emission from ‘double-metal’ emitters based on lateral photo-Dember/Schottky barrier emission. The THz emitters are robust, easy to fabricate and do not require an external bias to function.

Relaying the message

Researchers in Korea propose a scheme to improve the quality of cellular communications for users on the edge of a cell. With the scheme using an additional basestation from the neighbouring cell, bit error rate and throughput improvements are predicted.

Resonant connections

Cross-coupled diplexers based on all-resonator structures, which remove the need for separate frequency distribution networks, are investigated in work from the UK. The approach uses cross-couplings between common resonators and branch resonators, increasing the possible frequency responses, and lends itself to designs with challenging specifications, such as high isolation and sharp rejection.

Flicker free

A flicker-free transformerless LED driving circuit with power factor correction (PFC) is presented in work from China. The convertor combines a cascaded input buck PFC converter and an output buck DC-DC converter with a single switch and simple control method, complies with EN61000-3-2, has a low output voltage without a high step-down transformer and reduces second-order line frequency current ripple to eliminate flicker.

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Cover of Electronics Letters, Volume 49, Issue 25

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