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dc couple
There are two ways LiDAR systems are configured. This is a DC-coupled example where the avalanche photodiode anode is directly attached to the input of the TIA. If higher clamp currents are required, an external Schottky diode can be placed in parallel with the internal diode. The offset current of the amplifier can be adjusted by driving a current into the offset pin at a ratio of 4 to 1 adjustment current to offset current. Supply bypassing is not shown, but is also needed due to the sensitivity of this system to supply current variation. Bypassing needs to ensure a low impedance from VCC to ground from 10 Hertz to 700 MHz.
PTM Published on: 2018-08-02