Distributed switched-resistor approach for high-Q biquad filters

Centurelli, Francesco; Fava, Alessandro; Scotti, Giuseppe; Trifiletti, Alessandro

doi:10.1016/j.aeue.2021.153894

Cited by 5 publications

(5 citation statements)

References 21 publications

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“…Switched resistors are widely used in various circuit designs for biomedical applications due to their high flexibility in resistance values and arrangements. For example, switched resistors can be used as critical components to achieve different functions in active RC filters [ 133 ], preamplifiers [ 134 ], switched resistor filters [ 135 , 136 ], pulse generators [ 137 ], and other circuits. In addition, due to the widespread use of CMOS technology, switched resistors are used for analog signal processing in digital circuits.…”

Section: Transimpedance Amplifier Designmentioning

confidence: 99%

“…However, it was not until recently that switched resistors were first applied as feedback elements in transimpedance amplifiers for biomedical applications [ 16 ]. The conventional switched resistor approach [ 16 , 135 ] uses a transmission gate switch (TG) and a polysilicon resistor in series, controlled by a digitally adjustable clock signal. The average current flow through the series varies with the duty cycle of the clock signal, leading to a corresponding change in the equivalent conductance of the circuit.…”

Section: Transimpedance Amplifier Designmentioning

confidence: 99%

“…In forthcoming research, the distributed switched resistor approach [ 135 ] may be deemed worthy of pursuit in TIA design. This technique can achieve high resistance multiplication factors up to several thousand even when employing minuscule duty cycles.…”

Section: Transimpedance Amplifier Designmentioning

confidence: 99%

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Unlocking the Power of Nanopores: Recent Advances in Biosensing Applications and Analog Front-End

Liu

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Biosensors

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The biomedical field has always fostered innovation and the development of various new technologies. Beginning in the last century, demand for picoampere-level current detection in biomedicine has increased, leading to continuous breakthroughs in biosensor technology. Among emerging biomedical sensing technologies, nanopore sensing has shown great potential. This paper reviews nanopore sensing applications, such as chiral molecules, DNA sequencing, and protein sequencing. However, the ionic current for different molecules differs significantly, and the detection bandwidths vary as well. Therefore, this article focuses on current sensing circuits, and introduces the latest design schemes and circuit structures of different feedback components of transimpedance amplifiers mainly used in nanopore DNA sequencing.

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Section: Transimpedance Amplifier Designmentioning

confidence: 99%

Section: Transimpedance Amplifier Designmentioning

confidence: 99%

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Unlocking the Power of Nanopores: Recent Advances in Biosensing Applications and Analog Front-End

Liu

Tan

2023

Biosensors

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“…For more information, see https://creativecommons.org/licenses/by/4.0/ Switched-Capacitor and pseudo-resistor approaches, especially in biomedical applications. In fact, the S-R approach has been successfully exploited in [12], [13], and [14] to implement tunable filters, TIAs and analog front-ends for biomedical integrated circuits.…”

Section: Introductionmentioning

confidence: 99%

A Detailed Model of Cyclostationary Noise in Switched-Resistor Circuits

Fava

Centurelli

Scotti

2023

IEEE Trans. Circuits Syst. I

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The Switched-Resistor (S-R) technique is becoming more and more interesting to implement low-voltage low-power active-RC filters with high tuning range and front-end amplifiers for biomedical circuits and systems. This approach exploits MOS switches driven by a duty-cycle-controlled clock signal to achieve tunability of the equivalent resistance and, hence, of the RC time constant. Since S-R circuits can be considered as linear periodically time variant (LPTV) systems with sampled outputs, we exploit the theory of the adjoint (inter-reciprocal) network in order to develop a detailed model of the cyclostationary noise involved in this kind of circuits. The proposed model allows to gain insight into the different noise sources and transfer functions involved, highlighting the circuit parameters on which the cyclostationary noise depends. Validation of the proposed model has been carried out by comparing analytical results against periodic noise simulations referring to a commercial 130nm CMOS process. The validation activity has confirmed the good accuracy of the proposed noise model and provided some useful design guidelines to optimize the noise performance of S-R circuits.

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“…A novel approach to implement digitally tunable and high-valued resistors is represented by the Switched-Resistor (SR) technique [14][15] [16], which is gaining popularity among designers of integrated circuits for biomedical applications [17][18] [19]. A digital tuning of the equivalent resistance is achieved by a duty cycle controlling unit which adjusts the clock signal driving the SR.…”

Section: Introductionmentioning

confidence: 99%