Non-linear model for pseudo CMOS resistors addressing the recovery time in bio-amplifiers

Pereira, Christiane Mendes Drozdek; Galeti, Milene; Buhler, R. T.; Lucchi, Júlio César; Giacomini, Renato

doi:10.1088/1361-6641/ab2784

Cited by 3 publications

(14 citation statements)

References 15 publications

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“…As previously defined in [6], the complete bio-amplifier transfer function is defined by equation ( 4). The positive slope asymptote in the bandwidth (low frequencies) mainly depends on the pseudo-resistor Rp and the feedback capacitance…”

Section: Bio-signal Qrs Complex Detector Frequency Responsementioning

confidence: 99%

“…The PWL macromodel uses networks composed of an ideal diode, a resistor and a voltage source to insert change points in the curve linear characteristics, in order to obtain an approximation by line segments of the pseudoresistor characteristic curve [6]. The first step for the PWL macromodel adjustment in temperature dependence was the pseudo-resistance characterization with temperature variation.…”

Section: Evaluation Of the Pwl Macro-model With Temperature Dependencementioning

confidence: 99%

“…They are transducers responsible to convert the ionic biopotentials generated in patient's body into electronic potentials, before they can be measured by conventional methods. Pseudo-resistor connected in the feedback loop using the back-to-back topology of the bio-signal QRS complex detector [6].…”

Section: Introductionmentioning

confidence: 99%

“…A new and refined design of a bio-signal QRS complex detector with pre-amplifier is presented in figure 1. It was developed by the authors [6] based on inversion coefficient methodology for analog circuit designs [7,8], to detect the QRS complex present in the ECG. This detector provides an expressive reduction of the signal recovery time that can be caused by the patient movements [9].…”

Section: Introductionmentioning

confidence: 99%

“…They usually make use of fixed resistances or transistors modelled as pseudo-resistors. The SPICE model based on piecewise linear (PWL) methodology developed previously by the authors [6] includes both linear and non-linear working regions. However, the model does not consider the dependence with the temperature.…”

Section: Introductionmentioning

confidence: 99%

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Modeling and experimental evaluation of pseudo-resistor’s temperature dependence

Pereira

Galeti

Testa

et al. 2020

Semicond. Sci. Technol.

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This work presents the experimental temperature dependence evaluation of the pseudo-resistor piecewise linear (PWL) macromodel, for temperature ranging from 300 to 333 K. The studied macromodel is based on the PWL methodology and it can be used for pseudo-resistors SPICE simulation, including both linear and non-linear operation regions. This study was carried out using a low-frequency bio-potential amplifier with narrow bandwidth for use in QRS complex (part of the electrocardiogram which is a combination of the Q wave, R wave and S wave) detection systems. The architecture based on pseudo-resistors provides DC offset cancellation, adequate frequency response and a significant reduction of the signal recovery time. Both the pseudo-resistor and the QRS complex detector performance were experimentally measured with the temperature variation, in order to include this dependency in the PWL model. The transient recovery time, as well as the QRS complex detector frequency response, was also widely evaluated, in the proposed temperature range, through experimental measurements. The temperature dependence was added to the model and implemented in the SPICE simulation. The model outputs showed strong adherence to experimental data, showing a disagreement less than 6% in the low cut-off frequency. The macromodel’s response to the recovery time also followed the same experimental results behavior, presenting a maximum error of 20% within human body temperature range. The obtained recovery time was less than a normal heartbeat period to the entire temperature range evaluated. All of the analyzed circuits were implemented using GF 8HP 0.13 μm BiCMOS technology from Global Foundries.

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Section: Bio-signal Qrs Complex Detector Frequency Responsementioning

confidence: 99%

Section: Evaluation Of the Pwl Macro-model With Temperature Dependencementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Modeling and experimental evaluation of pseudo-resistor’s temperature dependence

Pereira

Galeti

Testa

et al. 2020

Semicond. Sci. Technol.

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Pseudo-Resistor-Based ECG Amplifier: Design, Implementation and Temperature Characterization

Barsocchi Testa Pessoa,

Fidelix Pereira,

Luiz Benko

et al. 2023

JICS

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Biomedical signal amplifiers are fundamental in various medical applications for acquiring crucial biological signals such as ECG, EEG, and EMG. The use of pseudo-resistors has been recently studied for biological amplifiers, mainly because of their fast recovery time after interference pulses, which are frequent in such applications. The previous studies on pseudo-resistors are limited to simulation, modeling, and implementing some narrow-bandwidth amplifiers. For the first time, this study uses the piecewise linear (PWL) model integrated with pseudo-resistors to design a tailored circuit for ECG applications, with 0.04 Hz to 2 kHz bandwidth for the full application temperature range. The circuit is fully modeled, simulated, and characterized, fine-tuning the feedback capacitance values to optimize performance within the crucial temperature range for biomedical applications. This full bandwidth amplifier represents a significant advancement in biomedical signal amplification technology, ensuring comprehensive signal fidelity allied to fast recovery response.

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Amplificador ECG incorporando pseudorresistores: projeto, implementação e caracterização em altas temperaturas

Pessoa

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Primeiramente dedico este trabalho a meus familiares, os quais não mediram esforços para me capacitar, e meu marido, o qual me incentivou e apoiou durante todos os momentos difíceis e desafiadores. Ademais, minha gratidão a todos os meus amigos, os quais me acompanharam em minha jornada.Agradeço ao meu professor orientador, Professor Dr. Renato Camargo Giacomini, por acreditar em meu potencial desde o início de minha graduação, e ao Professor Dr. Cleiton Fidelix Pereira, meu coorientador, por acompanhar meu desenvolvimento neste tema desde minha primeira Iniciação Científica, sendo crucial para meu progresso e crescimento profissional.Expresso minha gratidão a todos os profissionais do departamento de Engenharia Elétrica do Centro Universitário da Fundação Educacional Inaciana "Padre Sabóia de Medeiros", e todos os membros de meu grupo de pesquisa por todo o apoio que me foi concedido, não somente durante a realização deste projeto, mas também durante toda minha jornada. "O que prevemos raramente ocorre; o que menos esperamos geralmente acontece." Benjamin Disraeli "Não é na ciência que está a felicidade, mas na aquisição da ciência." Edgar Allan Poe. RESUMO Componentes eletrônicos, em geral, possuem grande sensibilidade às mudanças de temperatura. Temperaturas muito acima ou abaixo do valor considerado como ambiente causam uma mudança nas características físicas dos materiais dos componentes, acarretando um impacto significativo no desempenho e na confiabilidade dos dispositivos eletrônicos. Muitos dispositivos são projetados para operar dentro de uma faixa de temperatura específica e, se a temperatura exceder essa faixa, o dispositivo pode ser danificado ou não funcionar corretamente, fazendo com que, à medida que a temperatura aumente, o número de defeitos e falhas induzidas termicamente em dispositivos eletrônicos também aumente.O uso do pseudorresistor é uma técnica promissora para projetos de amplificadores biomédicos, uma vez que proporciona ao amplificador uma alta precisão, baixo ruído e ampla faixa de resposta em frequência. Além disso, os pseudorresistores na faixa de teraohms apresentam vantagens adicionais, como menor consumo de energia, melhor estabilidade térmica e menor área ocupada no chip em relação aos resistores convencionais. No entanto, o uso de pseudorresistores também pode apresentar desafios na implementação de circuitos, principalmente devido à complexidade do projeto e à necessidade de ajuste preciso dos parâmetros do circuito. Além disso, a variação de temperatura pode afetar a precisão do circuito que utiliza essa tecnologia, sendo necessário o uso de técnicas de compensação para minimizar esse efeito. Estudos anteriores sobre pseudorresistores estão limitados a simulações, modelagem e implementação de alguns amplificadores de banda estreita.Este estudo tem como objetivo projetar um circuito sob medida para aplicações de ECG, com largura de banda de 0,04 Hz a 2 kHz para a faixa completa de temperatura de aplicação. O circuito é digitalmente modelado, simulado e caracterizado, ajustand...

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Non-linear model for pseudo CMOS resistors addressing the recovery time in bio-amplifiers

Cited by 3 publications

References 15 publications

Modeling and experimental evaluation of pseudo-resistor’s temperature dependence

Modeling and experimental evaluation of pseudo-resistor’s temperature dependence

Pseudo-Resistor-Based ECG Amplifier: Design, Implementation and Temperature Characterization

Amplificador ECG incorporando pseudorresistores: projeto, implementação e caracterização em altas temperaturas

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