| 摘要 |
The electronic circuit is arranged for the fast, automatic gain control of an input amplifier. It includes a non-linear amplifier-comparator for comparing a reference signal (VR) to an amplitude signal (VP) at the output of the input amplifier. The amplifier-comparator performs dual slope adaptation of the input amplifier gain according to a defined deviation threshold between the two input signals. The amplifier-comparator includes two branches each with three transistors connected in series between the terminals of a supply voltage source. First and second polarisation transistors (M5, M6) are connected to the first and second input transistors (M1, M2) controlled by the first and second input signals, which are respectively connected to a first diode-connected transistor (M3) and a second transistor (M4) of a current mirror. A non-linear transconductance element (RNL) connects the sources of the input transistors to define a dual slope gain adaptation of the non-linear amplifier-comparator. |
