Circuit for amplifying transimpedance includes a buffer circuit to input signal currents, an equivalence resistance circuit and an amplifying circuit.

摘要

A buffer circuit (3) to input signal currents has first (J1) and second (J2) field effect transistors and a resistor (RJ) as well as highly efficient current sourcing and a wide frequency band for current signals. An equivalence resistance circuit (ERC) (2) has a resistor (RJ), a coupling capacitor (C2), a bias resistor (Rb) and first (U1) and second (U2) buffer units. When operating at low band, the ERC lets a background direct current flow through.