Channel select filter having a fully differential transresistance amplifier and CMOS current amplifier

A channel select filter comprising:

• a fully differential transresistance amplifier (FDTRA) configured to change an input current at each differential input terminal to a voltage at each differential output terminal based on an impedance at a corresponding differential impedance terminal;
• wherein the FDTRA includes a CMOS current amplifier having a class-AB output stage formed by a level shifter, a gain stage, and standby biasing transistors,
• two first resistors, each having one end connected to a respective differential input terminal of the FDTRA and having another end connected to a node;
• two feedback resistors, each having one end connected to a respective differential output terminal of the FDTRA and having another end connected to the node;
• two first capacitors, each connected between ground and the node;
• and
• two second capacitors, each connected between ground and a respective differential impedance terminal.