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SNOAA83 December 2021 TLV3601 , TLV3601-Q1 , TLV3603 , TLV3603-Q1

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Design Steps
Simulation Results
Design References
Design Featured Comparator
Design Alternate Comparator

Design Goals

System Supply	Photodiode Input Current Pulse Width	Transimpedance Amplifier		Output Type	Maximum Propagation Delay
5 V	3 ns	High Bandwidth	100-mV output swing	Single-ended	4 ns

Design Description

LiDAR Receiver Circuit

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.

Design Notes

Select a high-speed comparator that has narrow pulse width detection capability better than 3 ns
Derive the reference for the transimpedance amplifier and comparator from the same voltage source
Verify stability of the transimpedance amplifier configuration with selected photodiode