Digital post‑linearization increases the effective resolution of analog‑to‑digital conversions. The linearization technology developed by SP Devices suppresses low order non‑linearities of high‑performance ADCs and non‑linearities caused by pre‑ADC analog components (such as amplifiers, filters and buffers).
The transfer function of ADCs |
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All ADCs are non-linear |
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The ADL technology |
ADL compensates
ADL features
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The plots below show the result of applying ADL to the output of high-speed 16-bit ADCs mounted on reference boards available from each of the ADC manufacturers. The boards were operated at a sampling rate of 130 MSPS, and the plots show two-tone tests in the 5th Nyquist zone before (left) and after (right) being corrected by ADL. In this Nyquist zone, distortion is dominated by low order harmonic distortion, (HD2 and HD3). The plots show that regardless of the ADC model, the 2:nd and 3:rd order distortion spurs are attenuated to a level close to -100 dBFS. This means that the usable bandwidth is extended up to the 5th Nyquist Zone.
Analog Devices AD9461
National Semiconductor ADC16V130
Texas Instruments ADS5483
Linear Technology LTC2209
Associate Professor at Hong Kong University (HKU)
who has implemented a system supporting line scan rates of 10M lines/s
prof. Jakub Čížek, Department of Low Temperature Physics at Charles University, Prague
Associate Professor at Hong Kong University (HKU)
who has implemented a system supporting line scan rates of 10M lines/s
M. Sc. Grzegorz Nitecki, Faculty of Electronics, Military Academy of Technology, Warsaw, Poland
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