Editing Automatic gain control (section)

==How it works==
The signal to be gain controlled (the detector output in a radio) goes to a [[diode]] & [[capacitor]], which produce a peak-following DC voltage. This is fed to the RF gain blocks to alter their bias, thus altering their gain. Traditionally all the gain-controlled stages came before the signal detection, but it is also possible to improve gain control by adding a gain-controlled stage after signal detection.