João Goes

Bio: João Goes is an academic researcher from Universidade Nova de Lisboa. The author has contributed to research in topics: CMOS & Amplifier. The author has an hindex of 18, co-authored 180 publications receiving 1281 citations. Previous affiliations of João Goes include University of Lisbon & Instituto Superior Técnico.

A Two-Stage Fully Differential Inverter-Based Self-Biased CMOS Amplifier With High Efficiency

Abstract: A two-stage fully differential CMOS amplifier comprising inverters as input structures and employing self-biasing techniques is presented. The proposed amplifier benefits from an optimum compensation through time-domain optimization which permits achieving high energy efficiency. Moreover, it achieves the highest efficiency of its class and although it relies on a quasi-class-A topology, it is comparable to class-AB amplifiers. Detailed circuit analyses such as differential-mode, common-mode feedback, noise, slew rate, and input/output range are carried out. Based on these analyses, a manual design methodology and a genetic algorithm based optimization are presented. Finally, the most relevant experimental results for an integrated circuit prototype designed in a 0.13 μm 1.2 V standard CMOS technology are shown.

Systematic design for optimization of high-speed self-calibrated pipelined A/D converters

Abstract: High-speed pipelined analog-digital converters have been previously considered using optimum 1-bit per stage architectures that typically can attain untrimmed resolution of up to 10 bits. Conversion resolutions higher than 10 bits can only be achieved if calibration techniques are employed. In this case, however, this paper demonstrates that multibit, rather than single-bit resolution per-stage architectures have to be considered for optimizing the resulting area and power dissipation while minimizing stringent requirements of the constituting building blocks. Such optimization is achieved through a systematic design process that takes into account physical limitations for practical integrated circuit implementation, including thermal noise and capacitor matching accuracy. The impact of the selected pipelined configuration on the self-calibration requirements as well as on the practical feasibility of the active components is analyzed. An example is presented to consolidate the relevant conclusions.

Two-stage fully-differential inverter-based self-biased CMOS amplifier with high efficiency

Abstract: This paper describes a novel two-stage fully-differential CMOS amplifier comprising two self-biased inverter stages, with optimum compensation and high efficiency. Although it relies on a class A topology, it is shown through simulations, that it achieves the highest efficiency of its class and comparable to the best class AB amplifiers. Due to the self-biasing, a low variability in the DC gain over process, temperature, and supply is achieved. A detailed circuit analysis, a design methodology for optimization and the most relevant simulation results are presented, together with a final comparison among state-of-the-art amplifiers.

A 0.9V /spl Delta//spl Sigma/ Modulator with 80dB SNDR and 83dB DR Using a Single-Phase Technique

Abstract: A 2nd-order DeltaSigma ADC implemented in 0.18mum CMOS occupies 0.06mm2 and dissipates 0.2mW from a 0.9V supply. It achieves 80dB SNDR and 83dB DR over a 10kHz BW employing a single-phase technique to reach such performance. An amplifier-sharing scheme is proposed to improve power and area efficiency

An improved low-voltage low-power CMOS comparator to be used in high-speed pipeline ADCs

Abstract: This paper presents an improved low-voltage low-power CMOS comparator suitable for high-speed pipeline ADCs. Simulated results of the proposed circuit in a 0.35 /spl mu/m standard CMOS technology operating at supply voltages within the range of 1.0-1.5 V show that this comparator achieves low offset, reduced kickback noise, high mean-time to failure and exhibits low-power dissipation at very high-speed operation.

Design Of Analog Cmos Integrated Circuits

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General data protection regulation

Abstract: Presentacio sobre l'Oficina de Proteccio de Dades Personals de la UAB i la politica Open Science. Va formar part de la conferencia "Les politiques d'Open Data / Open Acces: Implicacions a la recerca" orientada a investigadors i gestors de projectes europeus que va tenir lloc el 20 de setembre de 2018 a la Universitat Autonoma de Barcelona

A 12-bit 75-MS/s pipelined ADC using open-loop residue amplification

Abstract: Precision amplifiers dominate the power dissipation in most high-speed pipelined analog-to-digital converters (ADCs). We propose a digital background calibration technique as an enabling element to replace precision amplifiers by simple power-efficient open-loop stages. In the multibit first stage of a 12-bit 75-MSamples/s proof-of-concept prototype, we achieve more than 60% residue amplifier power savings over a conventional implementation. The ADC has been fabricated in a 0.35-/spl mu/m double-poly quadruple-metal CMOS technology and achieves typical differential and integral nonlinearity within 0.5 LSB and 0.9 LSB, respectively. At Nyquist input frequencies, the measured signal-to-noise ratio is 67 dB and the total harmonic distortion is -74 dB. The IC consumes 290 mW at 3 V and occupies 7.9 mm/sup 2/.

A 3-10-Ghz low-noise amplifier with wideband LC-ladder matching network

Abstract: Reactive matching is extended to wide bandwidths using the impedance property of LC-ladder filters. In this paper, we present a systematic method to design wideband low-noise amplifiers. An SiGe amplifier with on-chip matching network spanning 3-10 GHz delivers 21-dB peak gain, 2.5-dB noise figure, and -1-dBm input IP3 at 5 GHz, with a 10-mA bias current.