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Author Articles

  • Power Supply Cuts Switching Noise In DDR Memory Systems

    By Jim Lepkowski, November 11, 2002

    This design idea describes a unique, low-cost power-supply circuit for a double-data-rate (DDR) memory system. Conventional designs for DDR memories consist of a dual buck converter and a voltage reference. In contrast, this design replaces one buck...

  • State-Variable Oscillator Suits Ratiometric Capacitive Sensors

    By Jim Lepkowski, September 30, 2002

    Often, it's necessary for a sensor system to compute the ratio of two capacitors. Doing so re-duces the transducer's sensitivity to dielectric errors from such factors as temperature. Furthermore, dual sensors are typically used to double the...

  • Dual-Gate Inverter Oscillator Saves Power, Boosts LED Brightness

    By Jim Lepkowski, June 24, 2002

    An LED's brightness is directly proportional to the current through it, which creates a challenge for low-voltage and battery-powered applications. But it's possible to increase an LED's brightness without increasing the system's power requirements....