heading-electronics-letters

Vol 48, No 10, 10 May 2012

  • Photograph and cross-section of the RTD oscillator mounted on Si hemispherical lens

    Intense resonance

    The first wireless data transmission at 542 GHz.

  • 3D integration technique

    Close to tiers

    RF circuits stack up as MIT demonstrates the first multi-tier switch using 3D integration.

  • Junghwan Kim

    Interview with Junghwan Kim

    Professor Junghwan Kim from Sejong University in Korea talks about the research behind his Letter High upconversion gain optoelectronic mixer using uni-travelling carrier phototransistors.

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Also in this issue

  • Diagram of the experimental setup

    Pulse power

    Research from the US and Germany demonstrates the potential of modelocked semiconductor VECSELs for high-power operation within the femtosecond regime. The work presents a VECSEL device with an average power above 5 W operating at room temperature and nearly transform-limited 682 fs pulses repeating at 1.71 GHz.  

  • Chart of intensity against position

    Low loss light

    Anti-guided laser arrays suitable for high-power, high-brightness sources suffer from high lateral radiation losses. A method for eliminating this loss with improved mode discrimination field uniformity is presented in work from the US, along with the design rules for such an array. This could lead to the creation of efficient, high-power arrays for applications in free-space communications, sensing/imaging and long-range directed energy.

  • ISFET - sensing array circuit diagram

    Chemical parasites

    Researchers in the UK have proposed an ISFET readout scheme with minimum analogue components to minimise parasitic and noise effects in large-scale chemical sensing arrays. The proposed scheme can convert the pH directly to a time-based signal, which is less susceptible to environmental noise and parasitics.

  • Chart of voltage/current relationship

    Controlled stimulation

    Researchers from Thailand and Germany present a power efficient, high-voltage compliance current driver for implantable neural stimulators with a simple compliance monitor for adaptive power reduction. In implantable stimulators, current-controlled, rather than voltage-controlled, stimulation is preferred owing to its safety, but there is a disadvantage in power efficiency. The work mitigates this by reducing the headroom voltage needed in the current driver.

  • Frequency response of the filters with different relative bandwidths

    Band control

    Using an elliptic-type configuration, collaborating researchers from China and Japan have designed a narrow bandwidth SAW/BAW filter on a high coupling factor piezoelectric substrate.  The design allows for flexible control of the passband width of the filter – usually limited by the electromechanical coupling factor of the substrate – and can be applied to RF duplex technology.

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