IQD has launched a new custom crystal filter
Berwick, "Silicon photonic crystal filter
with ultrawide passband characteristics," Optics Letters, Vol.
Zhang, "A novel comb-like plasma photonic crystal filter
in the presence of evanescent wave," IEEE Transactions on Plasma Science, Vol.
To get around this problem, the researchers use an analog crystal filter
, which exploits frequency differences between the modulated waves bouncing off the wall and those coming from the target.
A spectrally tunable source using a conventional lamp and monochromator with a multi-element liquid crystal filter
is currently under development (1).
Once on site, fill up a water container, drop in the Thames pump, plug it into the Crystal Filter
housing and turn on the tap.
For example, the two-port monolithic crystal filter
(MCF) device combines the best properties of both the BAW (bulk acoustic wave) and SAW (surface acoustic wave) devices.
The IF SAW or crystal filter
needed in the high IF case can be replaced with an active RC filter or other filter suitable for low frequency operation, that is also conducive to silicon integration.The low IF signal may be translated to baseband through another mixer, or preferably, in the digital domain following analog-to-digital (A/D) conversion.
This block is followed by a narrow crystal filter
. The pulse generator receives its input from this crystal filter
and produces a spectrum of n x 10 MHz multiples, which is the basis for all fixed or standard frequencies in the synthesizer.
Specific areas of interest include evaluation of material constants of quartz and other piezoelectric substances, development of equivalent networks for bulk and SAW resonators, filter crystal and crystal filter
design, measurement of circuit parameters of signal processing devices and precision resonators, development of crystal parameter measurement equipment, and growth of high purity quartz.