| 摘要 |
An automatic gain control system combining both analog and digital gain units, both controlled by a common digital control system. The overall system gain settings are selected by a combination of analog gain settings and digital gain settings. The number of analog gain settings is less than the total number of system gain settings, so that the board or chip area required for the analog gain settings is reduced, while sufficient range is provided to maintain a good signal to noise ratio from an A/D converter. When a required gain adjustment exceeds one step of the analog gain stage, the system simultaneously adjusts the analog gain and the digital gain unit to provide a smooth transition.
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