Bessel filter

About: Bessel filter is a research topic. Over the lifetime, 656 publications have been published within this topic receiving 16808 citations.

Bessel function output from an optical correlator

Abstract: We introduce a new filter for an optical correlator that produces a Bessel function correlation output. The advantage of this type of output is that the width of the central dark spot at the center of the correlator output is narrower than the width of the usual correlation spot. In addition, the dark spot is insensitive to changes in illumination intensity. We present experimental results with which we write the new filter onto a programmable magneto-optic spatial light modulator.

Low-power MOSFET-C 120 MHz Bessel allpass filter with extended tuning range

Abstract: An integrated delay cell for a disc-drive read channel has to combine a high 120 MHz bandwidth with a low power dissipation and a large 1:6 tuning range. Because of linearity and transfer requirements, the implementation is a continuous-time third-order Bessel allpass filter. An opamp-MOSFET-C configuration is best for low power consumption but has two problems: a small tuning range and often a low bandwidth. The author gives solutions to both problems, including a patented tuning-range extension circuit. Measurements show that the design method works well. The cell dissipates 15 mW at 27°C.