Abstract
A domain extension algorithm to correct the comparator offsets of pipeline analog-to-digital converters (ADCs) is presented, in which the 1.5-bit/stage ADC quantify domain is extended from a three-domain to a five-domain. This algorithm is designed for high speed and low comparator accuracy application. The comparator offset correction ability is improved. This new approach also promises significant improvements to the spurious-free dynamic range (SFDR), the total harmonic distortion (THD), the signal-to-noise ratio (SNR) and the minor analog and digital circuit modifications. Behavioral simulation results are presented to demonstrate the effectiveness of the algorithm, in which all absolute values of comparator offsets are set to |3Vref/8|. SFDR, THD and SNR are improved, from 34.62-dB, 34.63-dB and 30.33-dB to 60.23-dB, 61.14-dB and 59.35-dB, respectively, for a 10-bit pipeline ADC.
Highlights
analog-to-digital converters (ADCs) are widely used in many areas, such as music recording, healthcare, radar systems and communication [1]
In order to demonstrate the effectiveness of the domain extension algorithm, a 10-bit pipeline ADC was simulated in MATLAB
The dynamic performance as shown in the Fast Fourier Transform (FFT) plot is recorded as 34.62-dB spurious-free dynamic range (SFDR), 34.63-dB total harmonic distortion (THD), and 30.33-dB signal-to-noise ratio (SNR)
Summary
ADCs are widely used in many areas, such as music recording, healthcare, radar systems and communication [1]. Many digital background calibrations can only correct gain errors [10,11], which are caused by finite op-amp gain and capacitor mismatches. This leaves the comparator offsets corrected by the traditional digital error correction technique or not corrected at all. A new algorithm is developed to improve the comparator offset correction ability for the 1.5-bit/stage pipeline ADC. This innovative algorithm increases the comparator offset toleration ability by 50%. The algorithm provides crucial information on both overflow and underflow situations
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