Verstärker mit digital gesteuerter Verstärkung und Kamera mit einem solchen Verstärker

摘要

The amplifier includes a number (K) of amplifier stages (10) which receive an input voltage (Vin). The different gains of the amplifier stages are a multiple of a common base gain. A selection stage (20) has K logical inputs and switches to activate a single output and deactivate the others as a function of the logical input provided by a decoder (30) which interprets the M-N most significant bits (N-M-1) of the control word. The gain of the corresponding amplifier increases with the significance of these bits. The switching outputs are connected to an amplifier which has gain controlled by the N least significant bits (0-N-1). The gain of the amplifier varies from zero to the common base gain.