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For CMOS monolithic active pixels sensor readout, we developed two architectures of low power and low signal pipelined analog to digital converter (ADC) which are 5 bit, 25 MS/s pipelined ADC and 4 bit, 50 MS/s double sampling ADC. Both architectures include a non-resetting sample and hold stage to amplify the signal by a factor of 4. Due to the very low level of the incoming signal, this first stage...
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