-- My first post
Hi All,
I am SW engineer with limited experience in analog/RF circuits.
I am designing a laser radar. The Tx will send a very short electrical pulse (pulse width =5ns, current = 35A ,wavelength = 905 um) to laser diode (MPPC). The RX shall consist of photo detector diode , amplification stage and range circuit (TDC-GP21).
This is the recommended Rx configuration from the datasheets :
I read many articles on the internet about how much noise exists in such Rx circuits and I would like to avoid such things.
I have two options for the amplification stage
1- two cascaded OPA855 each one has gain of 20x . First stage is transimpedance configuration.
2- Use one IC which make all amplification without any external components such as ADA8282 (LNA+PGA), it has 4 channels and I was planning to use two of them in series.
The Rx will be implemented on 2-layer PCB
I appreciate if any expert here give some advices. I am also open to any other solutions/ICs.