Also, the examples typically use a low-pass filter to attenuate DAC output images before they go into the IQ modulator. For band-pass filters, a pullup network on the modulator side is needed to replace the filter termination and provide the modulator with its required common-mode voltage. ...
You want a high-pass filter to cut out the DC offset. So cap inline and resistor to ground. This approach will be fine - you could probably base it at a lower freq down to about 1-5Hz. http://www.bugbrand.co.uk http://soundcloud.com/bugbrand/ ...
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3. Compressed ambient air is filtered by a high-efficiency particulate air (HEPA) filter and then passes through a mass flow controller (MC 20SLPM, Alicat Scientific, USA) with an airflow rate of 20 L/min. The air stream is mixed with another specific pollutant stream from a standard gas...