Linear Operation Range for an Optically Triggered Switch Based on a p-i-n Photodiode

The nonlinear response of p-i-n photodiodes (PIN-PDs) has become a concern for circuit designers implementing PIN-PD-based switches because this response can significantly compromise systems performance. A major challenge with this implementation is the selection of an appropriate linear operation range from the I-V curve of the PIN-PD to reduce nonlinear effects. In this letter, a set of equations is derived to determine an operation point at the fourth-quadrant of the I-V curve. The determined operation point establishes a range of linear excursion for the peak-to-peak voltage input signal. The theoretical results obtained from linear approximation and numerical simulations were compared with practical measurements obtained from a switching circuit implemented with a commercial PIN-PD.