Flipped Voltage Follower-Based Voltage Conveyors: Investigation and Possible Enhancements

Psychalinos, Costas; Yeşil, Abdullah; Mınaeı, Shahram; Bertsias, Panagiotis

doi:10.1007/s00034-022-02230-0

Cited by 2 publications

(2 citation statements)

References 28 publications

(10 reference statements)

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“…In this regard, second-generation voltage conveyor (VCII) is presented in the literature to palliate the aforementioned disadvantages. [11][12][13][14][15][16] VCII combines features of current and voltage follower blocks for a wide range of operating region. In contrast to CCII, VCII based circuits brings a smooth tradeoff between input and output characteristics.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, they offer a heavy tradeoff between high output impedance, low input impedance, and current gain. In this regard, second‐generation voltage conveyor (VCII) is presented in the literature to palliate the aforementioned disadvantages 11–16 . VCII combines features of current and voltage follower blocks for a wide range of operating region.…”

Section: Introductionmentioning

confidence: 99%

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VCII based electronically tunable multi‐mode filter structure with fourth order low‐pass function for the HF band applications

Ozenli

Yeşil

2023

Circuit Theory & Apps

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SummaryIn this paper, we propose an electronically tunable multi‐mode filter structure with fourth‐order current mode low‐pass function based on second‐generation voltage conveyor (VCII) for the analog baseband applications. The fourth‐order low‐pass circuit consists of second‐order core filter structures including band and low‐pass outputs. The proposed fourth‐order circuit's cut‐off frequency can be easily varied from 1.6 up to 17.2 MHz for the high frequency (HF) applications used in multi‐standard receivers. Also, the core circuit of the fourth‐order architecture possesses current mode and transresistance mode filter functions enabling signal conversion and different signal operations. The given architecture has 116 μm × 39 μm chip area, and post layout simulations are demonstrated extensively. In addition, the performance of the proposed structure is examined based on commercial elements (AD844s). Also, detailed linearity analysis is given using post layout extractions. In fourth‐order low‐pass structure, cut‐off frequency can be safely tuned from 1.6 up to 17.2 MHz, whereas consumed power can be reduced to 0.769 μW. It can be investigated that the proposed circuit can be safely used for the analog baseband and HF operations in wireless receivers.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

VCII based electronically tunable multi‐mode filter structure with fourth order low‐pass function for the HF band applications

Ozenli

Yeşil

2023

Circuit Theory & Apps

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A chopper amplifier with adaptive biasing OTA for biomedical applications, featuring high gain and CMRR

Kasipogula,

Komanapalli

2024

PLoS ONE

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This paper presents a design of fully differential chopper amplifier employing the flipped voltage follower (FVF) adaptive biasing technique, focusing on its potential use in biopotential recording applications. The suggested architectural OTA incorporates self-cascoded current mirrors (SCCMs) as the active load to achieve a substantial output swing. The FVFs based adaptive biasing approach for the differential input stage boosts extra current and enhances gain and dynamic characteristics. The chopper amplifier attains a common mode rejection ratio (CMRR) of more than 100 dB through the strategic utilization of chopper modulators and pseudo-resistors. Additionally, this device exhibits characteristics such as accurate and stable gain, high input impedance, and a compact physical footprint. The present study also includes a comparison between the suggested structure and the bio-potential amplifiers discussed in the existing literature. This comparison is based on key metrics such as gain, input referred noise (IRN), CMRR, and input impedance (Zin). The proposed structure yielded a gain of 63.72 dB, an IRN of 0.07nVrms, a CMRR of 127.97 dB and a Zin of 1.54 GΩ. The bio-potential chopper amplifier under consideration was constructed and simulations were performed by utilizing the Cadence Virtuoso Spectre simulator tool at 180 nm CMOS technology node.

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Flipped Voltage Follower-Based Voltage Conveyors: Investigation and Possible Enhancements

Cited by 2 publications

References 28 publications

VCII based electronically tunable multi‐mode filter structure with fourth order low‐pass function for the HF band applications

VCII based electronically tunable multi‐mode filter structure with fourth order low‐pass function for the HF band applications

A chopper amplifier with adaptive biasing OTA for biomedical applications, featuring high gain and CMRR

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