Transimpedance amplifier having T-network feedback architecture and method thereof

A T-network feedback architecture with an operational amplifier, comprising:

• a first impedance network in series with an output terminal of the operational amplifier;
• a second impedance network in series with the first impedance network and operatively connected with an input terminal of the operational amplifier;
• a first pole having a first value generated by the first impedance network;
• a second pole having a second value generated by the second impedance network;
• a first capacitor of the first impedance network operatively connected with the output terminal of the operational amplifier;
• a first resistor of the first impedance network operatively connected with the output terminal of the operational amplifier;
• a second capacitor of the second impedance network operatively connected with the second input terminal of the operational amplifier and in series with first impedance network;
• and
• a first resistor of the second impedance network operatively connected with the second input terminal of the operational amplifier and in series with first impedance network;
• wherein the second capacitor of the second impedance network is in parallel with the second resistor of the second impedance network;
• wherein the first capacitor of the first impedance network is in parallel with the first resistor of the first impedance network;
• and
• wherein the first pole value and the second pole value are set equal to one another.

A method, comprising steps of:

• transmitting an input current, via a signal generating device, to an inverting input terminal of an operational amplifier;
• converting the input current to a first output voltage with a first gain value via the operational amplifier;
• outputting the first output voltage, via the operational amplifier, to a first impedance network;
• outputting a second output voltage with a second gain value, via the first impedance network, to a second impedance network, wherein the second gain value is different than the first gain value;
• and
• outputting a third output voltage with a third gain value, via the second impedance network, to the inverting input terminal of the operational amplifier, wherein the third gain value is greater than the second gain value;
• wherein the step of outputting a second output voltage with a second gain value, via the first impedance network, to a second impedance network further includes that the first impedance network comprises:
• defining a first resistance value by a first resistor;
• and
• defining a first capacitance value by a first capacitor;
• and
• wherein the step of outputting a third output voltage with a third gain value, via the second impedance network, to the inverting input terminal of the operational amplifier further includes that the second impedance network comprises:
• defining a second resistance value by a second resistor that is equal to the first resistance value defined by the first resistor;
• and
• defining a second capacitance value by a second capacitor that is equal to the first capacitance value defined by the first capacitor.