Abstract:
A pipelined analog-to-digital converter (100) includes a plurality of stages (101), each stage (101) comprising an analog-to-digital converter (ADC) (104, 405, 504, 502) and a digital-to-analog converter (DAC) (105, 123, 402, 505). A method for increasing the accuracy of the pipelined ADC (100) includes calibrating the ADC (104, 405, 504, 502) in each stage of the analog-to-digital converter (100) by adjusting trip points of that ADC (104, 405, 504, 502). Another method for increasing the accuracy of a pipelined ADC (100) includes measuring error in an output of each the DAC (105, 123, 402, 505); and correcting an output of the pipelined analog-to-digital converter (100) for the measured error. These methods can be used together to further increase the accuracy of the pipelined ADC (100). Consequently, a pipelined analog-to-digital converter (100) may include a look-up table (506) containing data for correcting errors in output of each of the DACs (105, 123, 402, 505), where trip points of the ADCs (104, 405, 504, 502) the ADCs (104, 405, 504, 502) in the stages (101) of the pipelined converter (100) have been calibrated to expected values.
Abstract:
A light-to-frequency converter includes a switch (130) connected in series with a reverse-biased photodiode (120). A node (150) in the current path through the switch and the photodiode is connected to the input of a Schmidt trigger (160), whose output controls the switch. New techniques are provided for motion compensation, partial readouts, dark current elimination, non-destructive testing, and sensing the state of a memory cell.
Abstract:
A light-to-frequency converter includes a switch (130) connected in series with a reverse-biased photodiode (120). A node (150) in the current path through the switch and the photodiode is connected to the input of a Schmidt trigger (160), whose output controls the switch. New techniques are provided for motion compensation, partial readouts, dark current elimination, non-destructive testing, and sensing the state of a memory cell.