Lecture 44 Introduction to Continuoustime Delta Sigma Modulators CTDSM

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Video Lecture Series by IIT Professors ( Not Available in NPTEL) • VLSI Data Conversion Circuits • By Prof. Nagendra Krishnapura and Prof.Shanthi Pavan • • For more video Lectures .... www.satishkashyap.com • For free ebooks ...... www.ebook29.blogspot.com • • Lecture 1 - Course overview and introduction. • Lecture 2 - Sampling, Spectral properties of sampled signals, Oversampling and its implications on anti-alias filter design. • Lecture 3 - Time Interleaved Sampling, Analysis of a Ping-Pong Sampling system. • Lecture 4 - Ping-pong Sample and Holds continued, Analysis of Offset and Gain Errors in Time-Interleaved Sample and Holds. • Lecture 5 - Sampling Circuits (NMOS, PMOS and CMOS Switches), Distortion due to the Sampling Switch. • Lecture 6 - Thermal Noise in Sample and Holds, Charge Injection in a Sampling Switch. • Lecture 7 - Bottom Plate Sampling, The Gate Bootstrapped Switch. • Lecture 8 - The Gate Bootstrapped Switch (continued), the Nakagome Charge-Pump. • Lecture 9 - Characterizing a Sample-and-Hold, Correct choice of input frequency, Discrete Fourier Series Refresher. • Lecture 10 - FFT Leakage and the Rectangular Window. • Lecture 11 - FFT Leakage (contd), Spectral Windows, the Hann Window • Lecture 12 - Spectral Windows (contd), the Blackman Window, Introduction to Switch Capacitor Amplifiers • Lecture 13 - Switch Capacitor Circuits, Parasitic Insensitive SC Amplifiers • Lecture 14 - Nonidealities in SC Amplifiers - Finite Opamp Gain and DC Offset., Lecture 14 - Part 2 - Finite Opamp Gain-Bandwidth Product. • Lecture 15 - Introduction to Fully Differential Operation. • Lecture 16 - Fully-differential operation (contd), motivation for common-mode feedback. • Lecture 17 - Fully Differential SC-circuits, the Flip-Around Sample and Hold, DC Negative Feedback in SC Circuits. • Lecture 18 - ADC Terminology, Offset and Gain Error, Differential Nonlinearity (DNL). • Lecture 19 -Integral Nonlinearity (INL), Dynamic Characterization of ADCs, SQNR, Quantization Noise Spectrum. • Lecture 20 - Quantization Noise Spectrum (contd), SFDR, Flash A/D Converter Basics. • Lecture 21 - Flash A/D Converter Basics, the Regenerative Latch. • Lecture 22 - The Regenerative Latch (contd). • Lecture 23 - Motivation to use a Preamp, Preamp Offset Correction (Autozeroing). • Lecture 24 - Autozeroing a Differential Preamp, Subtracting References from the Input. • Lecture 25 - Coupling Capacitor Considerations in an Autozeroed Preamp. • Lecture 26 - Transistor Level Preamp Design. • Lecture 27 - Necessity of an up-front sample and hold for good dynamic performance. Timing issues in a flash ADC. • Lecture 28 - Bubble Correction Logic in a Flash ADC, Comparator Metastability, Case Study.(VERY POOR AUDIO QUALITY !) • Lecture 29 - Flash ADC Case Study (Continued). • Lecture 30 - D/A Converter Basics, INL/DNL, DAC Spectra and Pulse Shapes. • Lecture 31 - NRZ vs RZ DACs, DAC Architectures. • Lecture 32 - Binary Weighted versus Thermometer DACs. • Lecture 33 - Binary vs Thermometer DACs (Contd), Current Steering DACs. • Lecture 34 - Current Steering DACs (contd) . • Lecture 35 - Current Cell Design in a Current Steering DAC. • Lecture 36 - Current Cell Design (contd), Layout Considerations in Current Steering DACs. • Lecture 37 - Oversampled Approaches to Data Convresion, Benefits of Oversampling. • Lecture 38 - Oversampling with Noise Shaping, Signal and Noise Transfer Functions, First and Second Order Delta-Sigma Converters. • Lecture 39 - Signal Dependent Stability of DSMs, the Describing Function Method. • Lecture 40 - Stability in DSMs (continued). • Lecture 41 - Maximum Stable Amplitude of DSMs and Relation to Out of Band Gain, Systematic NTF Design. • Lecture 42 - Systematic NTF Design (contd), the Bode Sensitivity Integral and its Implications on NTF Design. • Lecture 43 - Estimating the Maximum Stable Amplitude from simulation, Computation of in-band SNR, Windowing revisited. • Lecture 44 - Introduction to Continuous-time Delta Sigma Modulators (CTDSM). • Lecture 45 - CTDSM basics (contd), time-scaling of CTDSMs. • Lecture 46 - The inherent anti-aliasing property of CTDSMs. • Lecture 47 - Excess Loop Delay in CTDSMs. • Lecture 48 - Time-constant changes in CTDSMs, Influence of opamp nonidealities. • Lecture 49 - Effect of opamp nonidealities (contd) - finite gain bandwidth, Effect of ADC and DAC nonidealities. • Lecture 50 - Effect of DAC element mismatch (contd), Dynamic Element Matching (Randomization). • Lecture 51 - Dynamic Element Matching by Data Weighted Averaging. • Lecture 52 - Effect of Clock jitter in CTDSMs. • Lecture 53 - Finding Loopfilter Coefficients in Higher Order CTDSMs. • Lecture 54 - Dynamic Range Scaling of the Loop 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