Sinusoid Based Foreground Calibration Algorithm of a Pipeline ADC Using Time Averaged Radix Extraction

An Adaptive Gain Tuner Based Fore-ground Calibration Algorithm of a Pipeline ADC

“…In this paper a low power mixed signal foreground calibration technique has been proposed based on a digitally assisted dynamic switched capacitor gain tuner. Unlike radix extraction based foreground calibration technique ( [8], [12]- [15]), the proposed method forces the MDAC gain value of a pipeline stage to its ideal value by deliberately skewing the ideal passive component ratio and proper choice of amplifier open loop gain [11]. The advantage of using the proposed calibration algorithm over the radix extraction based calibration algorithm is two fold.…”

“…In doing so, the proposed method calibrates the relevant stage gain to its ideal value, rather than extracting its actual value. Secondly, typical radix extraction based algorithms often requires complex back end post processing to generate the correct radices ( [6], [8] and, [12]- [15]), e.g., an iteration and update algorithm. In the proposed method, a fairly simple feedback mechanism does the job of calibrating the ADC output, without the need of an iteration and update method.…”

“…Rest of the stages, forming a 10 bit linear back-end ADC (BE-ADC), helps in the calibration process. As shown in [8], [9], [10] and [12]- [14], BE-ADC outputs are used as data for the post processing in order to carry out objectives such as extraction of radices of the target stages. It may be noted here that using an N bit BE-ADC for post processing is a fairly standard practice for algorithms using radix extraction.…”

An Adaptive Gain Tuner Based Fore-ground Calibration Algorithm of a Pipeline ADC

“…In this paper a low power mixed signal foreground calibration technique has been proposed based on a digitally assisted dynamic switched capacitor gain tuner. Unlike radix extraction based foreground calibration technique ( [8], [12]- [15]), the proposed method forces the MDAC gain value of a pipeline stage to its ideal value by deliberately skewing the ideal passive component ratio and proper choice of amplifier open loop gain [11]. The advantage of using the proposed calibration algorithm over the radix extraction based calibration algorithm is two fold.…”

“…In doing so, the proposed method calibrates the relevant stage gain to its ideal value, rather than extracting its actual value. Secondly, typical radix extraction based algorithms often requires complex back end post processing to generate the correct radices ( [6], [8] and, [12]- [15]), e.g., an iteration and update algorithm. In the proposed method, a fairly simple feedback mechanism does the job of calibrating the ADC output, without the need of an iteration and update method.…”