|System Supply||Photodiode Input
Current Pulse Width
|Transimpedance Amplifier||Output Type||Maximum Propagation Delay|
|High Bandwidth||100-mV output swing||Single-ended||4 ns|
This circuit must be able to detect a 3-ns pulse received on a photodiode from a light pulse. To do this, a transimpedance amplifier and a high-speed comparator are required. To meet the propagation delay requirement, this design uses the OPA858 5.5-GHz gain bandwidth product, decompensated transimpedance amplifier with FET inputs and the TLV3601 2.5-ns high-speed rail-to-rail comparator with push-pull outputs.