Wiki

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
university:tools:m2k:scopy:adcdigitalfilters [10 Jan 2020 16:47]
dmercer [ADC digital filters]
university:tools:m2k:scopy:adcdigitalfilters [25 Feb 2020 06:44] (current)
andreeapop [ADC digital filters]
Line 7: Line 7:
 As in any voltage divider, parasitic capacitance introduces a low pass frequency response for signals passing through the divider and needs to compensated. This is generally done by adding adjustable capacitance to the divider network. Hardware frequency compensation calibration of the ADALM2000 is performed by adjusting the 4 trimmer capacitors so that a test square waveform looks as flat top as possible. During board production the trim capacitors are adjusted in the high gain mode. However, even for a this very accurate calibration,​ when switched to low gain mode the frequency compensation may not be as good. To solve this mismatch issue between gain ranges two digital filters have been included in the Scopy software with adjustable gain and time constant parameters. As in any voltage divider, parasitic capacitance introduces a low pass frequency response for signals passing through the divider and needs to compensated. This is generally done by adding adjustable capacitance to the divider network. Hardware frequency compensation calibration of the ADALM2000 is performed by adjusting the 4 trimmer capacitors so that a test square waveform looks as flat top as possible. During board production the trim capacitors are adjusted in the high gain mode. However, even for a this very accurate calibration,​ when switched to low gain mode the frequency compensation may not be as good. To solve this mismatch issue between gain ranges two digital filters have been included in the Scopy software with adjustable gain and time constant parameters.
  
-The filters can be enabled or disabled in Scopy from the Preferences tab and when enabled, their configurable parameters are found in the Oscilloscope instrument under the corresponding channel settings. Each filter has its own pair of parameters: gain and time constant. These parameters depend on the residual frequency response of the hardware divider network after the trim capacitors have been adjusted.  ​+The filters can be enabled or disabled in Scopy from the Preferences tab and when enabled, their configurable parameters are found in the [[university:​tools:​m2k:​scopy:​oscilloscope|Scopy ​Oscilloscope]] instrument under the corresponding channel settings. Each filter has its own pair of parameters: gain and time constant. These parameters depend on the residual frequency response of the hardware divider network after the trim capacitors have been adjusted.  ​
  
 {{ :​university:​tools:​m2k:​scopy:​scopy_preferences.png?​900 |}} {{ :​university:​tools:​m2k:​scopy:​scopy_preferences.png?​900 |}}
university/tools/m2k/scopy/adcdigitalfilters.txt · Last modified: 25 Feb 2020 06:44 by andreeapop