CPC H03F 3/45753 (2013.01) [H03F 2200/228 (2013.01); H03F 2200/331 (2013.01); H03F 2200/447 (2013.01); H03F 2200/471 (2013.01); H03F 2203/45441 (2013.01); H03F 2203/45514 (2013.01)] | 19 Claims |
1. An amplification-interface circuit of a sensor circuit formed by a first field effect transistor (FET) and a second FET arranged in a differential pair to supply a differential current to a first node and a second node, comprising:
a differential-current reading circuit including a first input terminal connected to said second node and a second input terminal connected to said first node, said differential-current reading circuit comprising a continuous-time sigma-delta conversion circuit including at least one integrator-and-adder module generating an output signal that is coupled to an input of a multilevel quantizer circuit configured to output a multilevel quantized signal;
wherein said at least one integrator-and-adder module comprises:
a differential current-integrator circuit configured to output a voltage proportional to an integral of a difference between currents received at said first and second input terminals; and
a digital-to-analog converter, driven by a respective reference current generated by a reference current generator, configured to receive and convert said multilevel quantized signal into a differential analog feedback signal;
wherein said differential current-integrator circuit is configured to add said differential analog feedback signal to said currents received at said first input terminal and said second input terminal.
|