Download Circuit Techniques for Low-Voltage and High-Speed A/D by Mikko E. Waltari PDF
By Mikko E. Waltari
The expanding digitalization in all spheres of electronics functions, from telecommunications structures to customer electronics home equipment, calls for analog-to-digital converters (ADCs) with a better sampling expense, better answer, and decrease energy intake. The evolution of built-in circuit applied sciences partly is helping in assembly those standards by way of offering swifter units and taking into consideration the conclusion of extra complicated services in a given silicon sector, yet concurrently it brings new demanding situations, an important of that is the reducing provide voltage. according to the switched capacitor (SC) procedure, the pipelined structure has such a lot effectively exploited the gains of CMOS expertise in knowing high-speed high-resolution ADCs. An research of the results of the provision voltage and know-how scaling on SC circuits is performed, and it indicates that advantages should be anticipated not less than for the following couple of know-how generations. The operational amplifier is a relevant development block in SC circuits, and therefore a comparability of the topologies and their low voltage features is gifted. it's famous that the SC approach in its general shape isn't really compatible for terribly low offer voltages, as a rule as a result of inadequate swap keep watch over voltage. low-voltage ameliorations are investigated: change bootstrapping and the switched opamp (SO) process. stronger circuit constructions are proposed for either. ADC prototypes utilizing the SO strategy are awarded, whereas bootstrapped switches are used in 3 different prototypes. a vital part of an ADC is the front-end sample-and-hold (S/H) circuit. At excessive sign frequencies its linearity is predominantly decided through the switches applied. A assessment of S/H architectures is gifted, and turn linearization by way of bootstrapping is studied and utilized to 2 of the prototypes. one other vital parameter is sampling clock jitter, that is analyzed after which minimized with carefully-designed clock new release and buffering. The throughput of ADCs should be elevated through the use of parallelism. this can be verified at the circuit point with the double-sampling method, that's utilized to S/H circuits and a pipelined ADC. An research of nonidealities in double-sampling is gifted. on the procedure point parallelism is used in a time-interleaved ADC. The mismatch of parallel sign paths produces blunders, for the removing of which a timing skew insensitive sampling circuit and a electronic offset calibration are built. Circuit options for Low-Voltage and High-Speed A/D Converters offers a complete of 7 prototypes: double-sampled S/H circuits, a time-interleaved ADC, an IF-sampling self-calibrated pipelined ADC, a present guidance DAC with a deglitcher, and pipelined ADCs using the SO options. This monograph will turn out to be an invaluable reference for either lecturers and pros whom are energetic within the Analog Circuit layout and Communications box.
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Extra info for Circuit Techniques for Low-Voltage and High-Speed A/D Converters
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With TABU, unacceptable points are recorded and not simulated again so the total number of iterations to find an acceptable set of solutions is reduced. However, the TABU method is not reliably applied with the simulated annealing algorithm because it effectively inhibits the hill climbing process. That is, the solution search may become stuck at a local minimum because TABU disallows hill climbing over known unacceptable solutions in search of the optimum. To achieve the advantages of TABU while avoiding the catastrophic disadvantage described above, a tunneling technique is proposed, as illustrated conceptually in Fig.