Picor Active Filters Overcome Noise
Challenges for Helicopter Displays
Picor's Active output filters have been designed into a wide variety of display applications from Medical X-ray and MRI to commercial and military aircraft displays. Video designers are replacing bulky cathode-ray tube displays with much thinner and space-efficient liquid crystal (LCD) and light emitting diode (LED) displays. For new applications, some are specifying displays as small as 2.5in across to make the most of the cockpit space. These changes create new demands on the power source and on the management of the Periodic and Random Disturbances (PARD), the noise on the input power to the display.
Picor active ripple attenuators meet the stringent requirements of, for one example, the US Department of Defense DO160 standard and provided higher attenuation than passive filters in a much smaller space. Picor’s QPO active filters provide output ripple and noise attenuation of more than 30 dB from 1 kHz to 500 kHz and more than 20 dB in the 50 Hz to 500 Hz range. The QPO features a standard 25 mm x 25 mm form-factor. A single module replaces several bulky passive components and provides better results. For higher power the uRAM active filter can provide >40dB attenuation from a 60 Hz to 1 MHz, up to 30A, in a 57.9mm x 36.8 mm form-factor.
Able to support load currents up to 30A, these small filter modules can handle a wide voltage range from 0.3 V to 30 V DC, as well as providing better noise attenuation than a bulky network of external passive components. The QPO and uRAM closed-loop architectures improve transient response – vital for modern embedded computers and displays – and ensure quiet point-of-load attenuation. The efficiency of the active filters can be as high 99%; the uRAM also includes built-in ORing functionality.
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