Pipelined ADC Design and Enhancement Techniques

ISBN-13: 9789400731790 / Angielski / Miękka / 2012 / 200 str.

Imran Ahmed

Opis

Pipelined ADCs have seen phenomenal improvements in performance over the last few years. As such, when designing a pipelined ADC a clear understanding of the design tradeoffs, and state of the art techniques is required to implement today's high performance low power ADCs.

Spis treści

Chapter 1: Introduction. 1.1 : Overview. 1.2 : Chapter outline. SECTION I: PIPELINED ADC DESIGN. Chapter 2: ADC Architectures. 2.1 : Overview. 2.2 : Factors which determine ADC resolution and linearity. 2.3 : ADC architectures. 2.4 : ADC Figure-of-Merit. 2.5 : Flash ADC. 2.6 : SAR ADC. 2.7 : Sub-sampling. 2.8 : Summary. Chapter 3: Pipelined ADC Architecture Overview. 3.1 : Overview. 3.2 : Pipelined ADC introduction. 3.3 : Multiplying Digital to Analog Converter (MDAC). 3.4 : Opamp DC gain requirements. 3.5 : Opamp bandwidth requirements. 3.6 : Thermal noise requirements. 3.7 : MDAC design - capacitor matching/linearity. 3.8 : Error correction in Pipelined ADCs – relaxed sub-ADC requirements. 3.9 : Sub-ADC design – comparator. 3.10 : Front-end Sample-and-hold. 3.11 : Summary. Chapter 4: Scaling Power with Sampling rate in an ADC. 4.1 : Overview. 4.2 : ADC power as a function of sampling rate. 4.3 : Digital versus analog power. 4.4 : Weak inversion model – EKV. 4.5 : Weak inversion issues – mismatch. 4.6 : Current scaling: Multiple design corners. 4.7 : Current scaling – Bias point sensitivity. 4.8 : Current scaling – IR drops. 4.9 : Summary. Chapter 5: State of the art Pipelined ADC Design. 5.1 : Overview. 5.2 : Calibration in pipelined ADCs. 5.3 : Power scalability with respect to sampling rate. 5.4 : Power reduction techniques in Pipelined ADCs. 5.5 : Summary. SECTION II: PIPELINED ADC ENHANCEMENT TECHNIQUES. Chapter 6: Rapid calibration of DAC and gain errors in a multi-bit pipeline stage. 6.1 : Overview. 6.2 : Motivation. 6.3 : Rapid DAC + gain calibration architecture. 6.4 : Circuit implementation. 6.5 : Testing. 6.6 : Measured results. 6.7 : Summary. Chapter 7: A Power Scalable and Low Power Pipelined ADC. 7.1 : Overview. 7.2 : Power scalable architecture. 7.3 : Current Modulated Power Scaling (CMPS). 7.4 : Current switching issues. 7.5 : Hybrid power scaling. 7.6 : Detailedtrigger analysis. 7.7 : Design of the digital state machine. 7.8 : Rapid Power-On Opamps. 7.9 : Common Mode Feed Back (CMFB) for Rapid Power-On Opamp. 7.10 : Power reduction through current modulation. 7.11 : Sample-and-Hold (S/H). 7.12 : 1.5-bit MDAC. 7.13 : Sub-ADC comparators. 7.14 : Bias circuits. 7.15 : Non overlapping clock generator. 7.16 : Reference voltages. 7.17 : Digital error correction. 7.18 : Experimental implementation – PCB. 7.19 : Experimental Implementation – Test setup. 7.20 : Measured results. 7.21 : Current scaled power. 7.22 : Power scalable ADC – Power Scaling using CMPS. 7.23 : Summary. Chapter 8: A sub-sampling ADC with embedded sample-and-hold. 8.1 : Overview. 8.2 : Motivation. 8.3 : Embedded S/H technique. 8.4 : Circuit implementation. 8.5 : Test setup – PCB. 8.6 : Test setup – Equipment. 8.7 : Measured results. 8.8 : Summary. Chapter 9: A capacitive charge pump based low power pipelined ADC. 9.1 : Overview. 9.2 : Motivation. 9.3 : Architecture – capacitive charge pump based gain. 9.4 : Effect of parasitic capacitors. 9.5 : Unity gain buffer topology. 9.6 : Noise analysis of capacitive charge pump based MDAC. 9.7 : Calibration of pipeline stages. 9.8 : Theoretical power savings. 9.9 : Design specifications. 9.10 : Circuit design. 9.11 : Testing. 9.12 : Measured results. 9.13 : Summary. Chapter 10: Summary. 10.1 : Summary. References. Index.

Blurb

Pipelined ADCs have seen phenomenal improvements in performance over the last few years. As such, when designing a pipelined ADC a clear understanding of the design tradeoffs, and state of the art techniques is required to implement today's high performance low power ADCs. Written for both researchers and professionals, Pipelined ADC Design and Enhancement Techniques provides:

i.) A tutorial discussion, for those new to pipelined ADCs, of the basic design and tradeoffs involved in designing a pipelined ADC

ii.) A detailed discussion of four novel silicon tested pipelined ADC topologies geared towards those looking to gain insight into state-of-the-art design in the area. The ADCs detailed include:

- An 11-bit 45MS/s ADC which rapidly digitally calibrates in the background both DAC and gain errors

- A 10-bit ADC with power scalable between 50MS/s (35mW) to 1kS/s (15µW)

- A 10-bit ADC for use in sub-sampled systems with a technique to eliminate the front-end sample-and-hold

- A 10-bit, 50MS/s ADC which uses a capacitive charge pump based approach to enable a very small power consumption of 9.9mW.