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12 Chapter 2: Nonlinearity at the ADC’s Front-End can include buffers or differential amplifiers depending on the application (see Figure 2.8(b)) [19], [20]. Transformers are used to effectively drive the ADC input with minimal noise and distortion degradation of the wanted signal. These are passive elements that do not add power dissipation to the system and are usually the best option at high input frequencies. However, in some applications, buffers or differential amplifiers should be used in the ADC’s driver circuit in order increase the dynamic range of the system or to keep the input impedance constant during the tracking and hold modes . Figure 2.6: Block diagram of the ADC’s front-end including input driving circuit and the acquisition stage. Figure 2.7: A simple track-and-hold stage at the acquisition stage of the ADC.
Chapter 2: Nonlinearity at the ADC’s Front-End 13 Figure 2.8: Block diagram of the ADC together with the input driving circuit. (a) Input driving circuit using a transformer. (b) Input driving circuit using a buffer or differential amplifiers. The above-described circuits at the front-end of the ADC add nonlinear errors to the system which are dynamic, meaning that they depend on the input frequency, and static digital compensation methods can not be used to cancel them. Therefore, these stages are usually a limiting factor in the high-frequency linearity performance of ADCs. In order to compensate the errors at these stages it is essential to find a compact model for the nonlinearity that can be used for efficient post-processing in the digital domain. In the following section, we will first discuss the track-and-hold circuit, which is the main source of dynamic errors in ADCs, and derive a compact model for its dominant source of frequency dependent nonlinearity. We will then discuss nonlinearities caused by second order effects in the input driving circuit in the following section and generalize the model to take those errors into account.
Page 1 and 2: DIGITAL COMPENSATION OF DYNAMIC ACQ
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Page 6 and 7: apply the inverse nonlinear functio
Page 8 and 9: Dr. Echere Iroaga, Dr. Yangjin Oh,
Page 10 and 11: Table of Contents Abstract.........
Page 12 and 13: 4.3.3 Algorithm performance on diff
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Page 27 and 28: Chapter 2 Nonlinearity at the ADC
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Page 59 and 60: Chapter 3: Digital Correction of Dy
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Chapter 3: Digital Correction of Dy
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Chapter 4 Experimental Results In t
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Chapter 4: Experimental Results 67
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Chapter 5 Impact of Substrate Noise
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Chapter 5: Impact of Substrate Nois
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Chapter 6 Conclusion 6.1 Summary IF
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Chapter 6: Conclusion 95 very sensi
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Chapter 6: Conclusion 97 the desire
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Appendix A TCAD Simulation of a Tra
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Appendix A: TCAD Simulation of Trac
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Appendix A: TCAD Simulation of Trac
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Appendix B Modeling Signal Derivati
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Appendix B: Modeling Signal Derivat
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Appendix C Coefficient Calibration
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Appendix C: Coefficient Calibration
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Bibliography [1] A.M.A. Ali et al.,
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Bibliography 115 [23] J. Kuo, R. Du
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Bibliography 117 [46] F. H. Irons,
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Bibliography 119 [68] B. Razavi, B.
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