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

Frequency equivalent circuits for the on and off state of an optically triggered switch based on a PIN photodiode

“…The study explained in this paper complements the study done in [13], so the designer can choose an operating point given by V bias and R L complying with a desired linear input range and also that meets a proposed frequency response that avoids overlap of the output's amplitude in the On and Off states. Although the measurements and modeling were performed for photodiodes with 1 GHz bandwidth, the technique used can also be applied for photodiodes with higher bandwidth.…”

“…These are first-order models and this allows us to easily relate the models to the photodiode capacitance, photodiode resistance, and load resistance. The models take into account the parameters of the switching circuit, V bias , R L , and R d , which in turn depend on the operating point and the desired linear range for the input's amplitude (as described in [13]); also from the measurements, equivalent capacitance was obtained for circuit models.…”

“…It takes into accounts the junction capacitance C don and the small signal resistance of the photodiode, R don . In the On state, R don depends on the operating point given by the bias voltage V bias and the load resistor R L as described in [13]. The capacitance can be obtained from the measurement of the frequency response; V db represents the photodiode dc voltage.…”

“…The dc voltage V bias is applied to bias the photodiode, and the signal V in (t) is superimposed on V bias . To operate the PIN-PD as an analogue switch the applied V bias and the selected R L must be able to operate the photodiode in the fourth quadrant of its I-V curve [13]. The chosen V bias must be large enough to prevent the switched signal swings going to the forward conduction region.…”

Characterization of a high-speed radio-frequency sampling and demultiplexing circuit based on the cascade connection of pin photodiodes

“…This PIN-PD has a reverse saturation current I sat = 0.2 nA and responsivity ℜ was 0.95 A/W at a wavelength of 1550 nm. To ensure a range of linear excursions for the peak-to-peak voltage input signal V RF (t), an operation point for the PIN-PD can be strategically selected [18][19][20]. For example, For the shown operation point, k = 23.4977 is calculated from I d = −I sat (e kV d -1) + I ph , where I ph = P ℜ is the photogenerated current.…”