Current-mode amplification system, and corresponding operational amplifier, gain section and amplification element

A current-mode amplification system, including a first gain section and at least one second gain section chained together to form a chain of gain sections;

• said first gain section comprising:
• amplification means receiving an input current which is the input current of said amplification system, and delivering an amplified output current;
• and
• low-pass filtering means receiving said amplified output current from said amplification means of said first gain section, and delivering an amplified and filtered output current;
• said second gain section comprising:
• amplification means having firstly a first input receiving the amplified and filtered output current from the preceding gain section in said chain, and secondly a second input receiving the input current of said amplification system, and delivering an amplified output current;
• activation/deactivation means for activating/deactivating said second input;
• and
• low-pass filtering means receiving said amplified output current from said amplification means of said second gain section, and delivering an amplified and filtered output current;
• and wherein said low-pass filtering means of each of said chained-together gain sections has a high cut-off frequency, the high cut-off frequencies of the various gain sections increasing from the input to the output of said amplification system.