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Remote sensing satellites use Charge Coupled Detectors (CCD) to achieve lower noise and higher dynamic range. Operation of a CCD requires high precision clocks/sequences. Generally it is achieved by using Phase Locked loop (PLL) or Delay Lock Loop (DLL). DLL are preferred for their low noise. An All Digital Delay Lock Loop (ADDLL) is designed to be used in the timing generation core. It is implemented...
The Readout Integrated Circuit (ROIC) consists of charge integration, charge to voltage conversion, Pixel voltage multiplexing, signal transfer and amplification stage. The control circuit manages all the sequential events from charge integration to amplification stage. The large dynamic range requirement is the most challenging aspect in modern CMOS process. The infrared (IR) detectors looks for...
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