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  • AN721: Impedance Matching Networks Applied to RF Power Transistors, Courtesy of Motorola
    Some graphic and numerical methods of impedance matching will be reviewed here. The examples given will refer to high frequency power amplifiers. Although matching networks normally take the form of filters and therefore are also useful to provide frequency discrimination, this aspect will only
  • Considerations for Driving Power MOSFETs in High-Current, Switch Mode Regulators
    The low on-resistance and high current carrying capability of power MOSFETs make them preferred switching devices in SMPS power supply design. However, designing with these devices is not as straightforward as with their bipolar counterparts. Unlike bipolar transistors, power MOSFETs have
  • Understanding the Phenomenon of High-Power Pulse Recovery in GaN LNAs
    The Gallium Nitride (GaN) high electron mobility. transistor (HEMT) is well known for its use in microwave and millimeter wave power amplifiers due to its high breakdown voltage and ability to handle high RF power. Recently, GaN technology has also been used to create low noise amplifiers (LNAs
  • The Future of Power Semiconductors: Rugged and High Performing Silicon Carbide Transistors
    SiC based systems have the revolutionary capability which can be characterized by a steep change in performance which can make them attractive for designers targeting innovative and disruptive solutions.
  • RF Power: GaN Moves In for the Kill
    papers, analyst reports, and corporate brochures. After all, GaN has at least ten times the power density per millimeter of transistor gate periphery, higher operating voltages (reducing impedance transformation issues), higher efficiency, and the ability to combine high RF power output over broad
  • The `Good Old` Power Days (.pdf)
    of high-voltage power transformers could put you to sleep. If a current needed "tweaking" you looked at a 3-inch panel meter, and took control with a knob you could get your whole fist around!. Power resistors were big wirewound guys. They had hollow cores and were covered with shiny brown enamel
  • Soft-Start Controller For Switching Power Supplies
    driven by the power supply is capacitive, the problem is exaggerated due to the large transient currents required to charge the capacitive load. In extreme instances, the repeated high stress of start-up can result in catastrophic failures in the driver section, typically, the power MOSFET transistors
  • Designing Power Supplies for Global Applications (.pdf)
    transistors-the two-transistor forward converter-can be used to provide low-cost, steady output voltages even when operating over a wide range of input voltages. (PWM) to provide high conversion efficiency. Such supplies are generally limited by the minimum pulse widths possible when using commercial PWM

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