Design of Wireless Autonomous Datalogger IC`s

Design of Wireless Autonomous Dataloggers IC's reveals the state of the art in the design of complex dataloggers, with a special focus on low power consumption. The emphasis is on autonomous dataloggers for stand-alone applications with remote reprogrammability.

The book starts with a comprehensive introduction on the most important design aspects and trade-offs for miniaturized low-power telemetric dataloggers. After the general introduction follows an in-depth case study of an autonomous CMOS datalogger IC for the registration of in vivo loads on oral implants. After tackling the design of the datalogger on the system level, the design of the different building blocks is elaborated in detail, with emphasis on low power.

A clear overview of the operation, the implementation, and the most important design considerations of the building blocks to achieve optimal system performance is given. Design of Wireless Autonomous Dataloggers IC's discusses the design of correlated double sampling amplifiers and sample-and-holds, binary-weighted current steering DACs, successive approximation ADCs and relaxation clock oscillators and can also be used as a manual for the design of these building blocks.

Design of Wireless Autonomous Dataloggers IC's covers the complete design flow of low-power miniaturized autonomous dataloggers with a bi-directional wireless link and on-board data processing, while providing detailed insight into the most critical design issues of the different building blocks. It will allow you to design complex dataloggers faster. It is essential reading for analog design engineers and researchers in the field of miniaturized dataloggers and is also suitable as a text for an advanced course on the subject.

Abstract I. List of Abbreviations and Symbols. Table of Contents. 1 Introduction. 2 General design aspects of miniaturized low-power dataloggers. 2.1 Introduction. 2.2 Biotelemetry systems. 2.3 Dataloggers. 2.3.1 Sensors. 2.3.2 Signal conditioning. 2.3.3 Data processing. 2.3.4 Power source. 2.3.5 Transceiver. 2.3.6 Packaging. 2.3.7 Smart sensors. 2.4 An injectable transponder example: from prototype to commercial device. 2.4.1 Prototype development: DEVICE 3. 2.4.1.1 General overview. 2.4.1.2 Modes of operation. 2.4.1.3 Practical realization and problems. 2.4.2 Market introduction: DEVICE 4. 2.4.2.1 Modi_cations. 2.4.2.2 Sensor channels. 2.4.2.3 Practical realization. 2.5 Conclusion. 3 Miniaturized datalogger for stress monitoring in oral implants. 3.1 Introduction. 3.2 Clinical background and motivation. 3.3 Measurement methodology. 3.4 External measurement system. 3.5 Strain gauges. 3.6 Specifications of the new miniaturized datalogger. 3.7 Conclusion. 4 Multi-gauge offset-compensated sensor interface chip. 4.1 Introduction. 4.2 Measurement/compensation setup. 4.3 Sensor interface building blocks. 4.3.1 Reference current source. 4.3.1.1 Operating principle. 4.3.1.2 Accuracy and mismatch. 4.3.1.3 Supply-voltage dependence. 4.3.1.4 Temperature dependence. 4.3.1.5 Current mirror inaccuracy. 4.3.2 DAC. 4.3.2.1 DAC requirements. 4.3.2.2 Operating principle and implementation. 4.3.2.3 Derivation and accuracy of the new unit current source. 4.3.3 PROG/SEL-block. 4.3.3.1 Implementation. 4.3.3.2 Programming protocol. 4.3.4 Amplifier. 4.3.4.1 Operating principle. 4.3.4.2 MUX. 4.3.4.3 Finite OTA gain. 4.3.4.4 Settling behavior. 4.3.4.5 Switches. 4.3.4.6 Clock feedthrough and charge injection. 4.3.4.7 Noise. 4.3.4.8 Distortion. 4.3.4.9 CMRR and PSRR. 4.3.5 S/H. 4.3.5.1 Operating principle. 4.3.5.2 Finite OTA gain. 4.3.5.3 Settling behavior. 4.3.5.4 Noise. 4.3.6 ADC. 4.3.6.1 Operating principle. 4.3.6.2 Charge redistribution DAC. 4.3.6.3 Comparator. 4.3.6.4 Reference current source. 4.3.6.5 Settling behavior. 4.3.6.6 Noise. 4.3.7 Oscillator. 4.3.7.1 Operating principle and implementation. 4.3.7.2 Non-overlapping clock generators and –sample. 4.4 Layout. 4.5 Experimental results. 4.5.1 Current consumption. 4.5.2 Clock. 4.5.3 ADC performance. 4.5.4 DAC performance. 4.5.5 Static measurements. 4.5.6 Dynamic measurements. 4.6 Conclusion. 5 Intelligent-datalogger IC with programmable data processing. 5.1 Introduction. 5.2 Principle of operation. 5.2.1 System overview. 5.2.2 Operation modes. 5.3 Digital part and external SRAM. 5.4 Transceiver. 5.5 Instruction set. 5.6 Building blocks of the digital part. 5.6.1 Programming and nulling units. 5.6.2 Data processing unit. 5.6.3 Sampling unit. 5.6.4 Receiving and transmission units. 5.7 Implementation and layout. 5.8 Experimental results. 5.9 Future work: packaging. 5.10 Conclusion. 6 Conclusion. A Transistor dimensions. B Digital error correction of ADC. C Sampling unit. C.1 VHDL code. C.2 Flowchart. List of Publications. Bibliography. Index.