Discovery Semiconductors, Inc.

Shubhashish Datta

Abhay M Joshi

A pseudo-random sequence generator for use within a universal lidar system and its corresponding method of operation. The pseudo-random sequence generator uses synchronized shift registers that are in series Binary adders are provided. The signal output of each of the shift registers is tapped and directed to the binary adders. High-speed switches are provided between the shift registers and the binary adders. The switches are programmed to connect only two of the shift registers to the binary adders for each of the pseudo-random patterns being generated. The binary adders generate an output signal that is received by the first shift register. The signal propagates through all the shift registers to the last shift register. The last shift register outputs a pseudo-random sequence.

Programmable pseudo-random sequence generator for use with universal lidar and its associated method of operation

A lidar system where a laser creates a laser output and the sequence generator creates a pseudorandom noise sequence. The laser output is directed into two paths. On the first path, the laser output is directed to a first modulator. The first modulator encodes the laser output with the pseudorandom noise sequence to produce an encoded output signal. The encoded output signal is amplified and directed toward a target, wherein a back-scattered signal is reflected back from the target. On the second path, the laser output is directed to a second modulator. The second modulator modulates the laser output to produce an oscillator signal. The back-scattered signal is aligned and is mixed with the oscillator signal from the second modulator. The resulting mixed signal is converted into a corresponding RF output signal. The RF output signal is cross-correlated with the pseudorandom noise sequence to acquire target data.

System and method for improving the resolution and sensitivity of lidar

A quad photoreceiver includes a low capacitance quad InGaAs p-i-n photodiode structure formed on an InP (100) substrate. The photodiode includes a substrate providing a buffer layer having a metal contact on its bottom portion serving as a common cathode for receiving a bias voltage, and successive layers deposited on its top portion, the first layer being drift layer, the second being an absorption layer, the third being a cap layer divided into four quarter pie shaped sections spaced apart, with metal contacts being deposited on outermost top portions of each section to provide output terminals, the top portions being active regions for detecting light. Four transimpedance amplifiers have input terminals electrically connected to individual output terminals of each p-i-n photodiode.

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Ewing, NJ, United States of America

Shubhashish Datta