The Research And Design Of Unmanned Aerial Vehicles Video Signal Processing Chip

Along with unmanned aerial vehicles system unceasing develope, the video signal processing chip does for an important part of unmanned aerial vehicles, gets more and more attention from the national. The video signal processing is the most important part of the remote sensing system, The sensitivity and reliability of the video signal processing chip has decided the overall system performance.The video signal processing chip is mainly composed by JS71186 and the special threshold level comparator JS988 two chips. JS71186 is composed by analog port JS71186A and digital port JS71187D. JS71186 include three port Choosing biggest network, the clock pulse produce, and comparaotor. Choosing biggest network can choose the biggest signal in ten video signals. We discuss and reasch the zener voltage in the clock pulse produce design. For twice tape out, JS71186A make a remodification to solver the problem that chip diswork at higt temperature, and promote the produce success rate. JS71186D include clock deal module, coding module, data temporary memory, high PSRR voltage reference. This reference is using cascode structure and linearity steady structure, and using small temperature to adjust in layout design. The reference has high PSRR and low temperature characteristic. Design the JS988 with E polar coupling to control the sample capacitance.The VH can change with the input signal. After the thesis made the chip layout and done lvs.Because design has used the biopolar and the CMOS two kind of process, therefore each part used the mix seal technology to complete one chip. The chip design has be amended several times in order to solve the problem happened in test, The chips design used the biopolar and the CMOS process, the chip uses the ceramic seal technology. The characteristic of the chip processing signal: the least pulse width is 50ns, the biggest signal is 4.5V, the smallest pulse which can be recognized is smaller than 100mV,the operating temperature can rang from -55 celsius to 125 celsius. Chip power consumption is about 2.1W.