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Mixed-signal analog-digital circuits design on the pre-diffused digital array using trapezoidal association of transistors

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Mixed-signal analog-digital circuits design on the pre-diffused digital array using trapezoidal association of transistors

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Título Mixed-signal analog-digital circuits design on the pre-diffused digital array using trapezoidal association of transistors
Autor Choi, Jung Hyun
Orientador Bampi, Sergio
Data 2001
Nível Doutorado
Instituição Universidade Federal do Rio Grande do Sul. Instituto de Informática. Programa de Pós-Graduação em Computação.
Assunto Microeletronica
[en] Analog cells
[en] CMOS analog design
[en] Physical implementation
[en] Sigma-Delta converters
[en] SOT array
[en] TAT transistors
[en] VLSI
Abstract The mixed-signal and analog design on a pre-diffused array is a challenging task, given that the digital array is a linear matrix arrangement of minimum-length transistors. To surmount this drawback a specific discipline for designing analog circuits over such array is required. An important novel technique proposed is the use of TAT (Trapezoidal Associations of Transistors) composite transistors on the semi-custom Sea-Of-Transistors (SOT) array. The analysis and advantages of TAT arrangement are extensively analyzed and demonstrated, with simulation and measurement comparisons to equivalent single transistors. Basic analog cells were also designed as well in full-custom and TAT versions in 1.0mm and 0.5mm digital CMOS technologies. Most of the circuits were prototyped in full-custom and TAT-based on pre-diffused SOT arrays. An innovative demonstration of the TAT technique is shown with the design and implementation of a mixed-signal analog system, i. e., a fully differential 2nd order Sigma-Delta Analog-to-Digital (A/D) modulator, fabricated in both full-custom and SOT array methodologies in 0.5mm CMOS technology from MOSIS foundry. Three test-chips were designed and fabricated in 0.5mm. Two of them are IC chips containing the full-custom and SOT array versions of a 2nd-Order Sigma-Delta A/D modulator. The third IC contains a transistors-structure (TAT and single) and analog cells placed side-by-side, block components (Comparator and Folded-cascode OTA) of the Sigma-Delta modulator.
Tipo Tese
URI http://hdl.handle.net/10183/2884
Arquivos Descrição Formato
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