| 摘要 |
A data independent AGC control circuit (100) for telecommunication applications is provided and includes an AGC amplifier (112), a fixed gain amplifier (114), a capacitor (150), and first, second, and third control circuits. The first control circuit (120) is coupled to the data output of the fixed gain amplifier (114) and to the capacitor (150), and increases the store charge on the capacitor (150) when the data output exceeds a desired peak voltage level. The second control circuit is similarly coupled to the data output of the fixed gain amplifier (114) and to the capacitor (150), and decreases the store charge on the capacitor (150) when the data output exceeds a threshold voltage (typically 1/2 the desired peak voltage level). The third control circuit (143, 146, and 148) is coupled to the second control circuit (130) and to the capacitor (150), and decreases the store charge on the capacitor (150) after the data output falls below the threshold voltage for a predetermined length of time.
|
