11A71: Difference between revisions

11A71 (view source)

192 bytes added , 17 July 2018

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 However, the 7A29 has a VARIABLE gain control
 while the 11A71 does not.
-The 11A71 only the 1-2-5 gain sequence.
-The 7A29 and 11A71 have the same Gilbert cell at the front end, but in the 11A71 it is only used for automatic calibration, not for fine gain control.
+The 11A71 has only the 1-2-5 gain sequence.
-This is a feature regression, but it avoids an issue that the 7A29 has:
+The 7A29 and 11A71 have virtually the same analog circuitry including a Gilbert multiplier at the front end,
-the bandwidth of the 7A29 varies depending on the setting of the VARIABLE gain.
+but in the 11A71 it is only used for automatic calibration, not for fine gain control.
+This is feature regression, but it avoids an issue that the 7A29 has: the bandwidth of the 7A29 changes substantially with the setting of the front panel VARIABLE VOLTS/DIV control.
+After calibration, there is a small imbalance in the 10mV/div setting, about 0.05 div.
+This is a design flaw.
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