Gm-C filter with automatic calibration scheme

Huang, Hong-Yi; Chen, Kun-Yuan; Xie, Jiahao; Lee, Ming-Ta; Hong, Hao-Chiao; Cheng, Kuo-Hsing

doi:10.1109/ddecs.2016.7482471

Cited by 5 publications

(7 citation statements)

References 9 publications

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“…They calibrate the Gm-C circuit by observing a testing output current or voltage. However, in most priors, the proposed filters only employ the frequency turning methodology without an automatic calibration scheme [7,8,10,17,19,24]. The proposed filter includes resistors, capacitors, inductors, and LC oscillators.…”

Section: Calibration Circuits Designmentioning

confidence: 99%

“…Therefore, a fast and accurate on-chip calibrating scheme is essential for overcoming unpredictable environmental conditions. Many filters are proposed from the mid-1980s to the early 2010s with tunable frequency performance for system requirements [3][4][5][6][7][8][9][10]. A continuous-time LC ladder was proposed by Krummenacher [3].…”

Section: Introductionmentioning

confidence: 99%

“…Tsividis concluded three basic automatic tuning schemes with an external referenced device or signal [9], and the calibrating or turning filter schemes were systematically discussed. Recently, a calibration scheme for the Gm-C voltage-type filter was proposed by adjusting the employed capacitors to fit the variation [10]. In [14][15][16][17][18][19][20][21][22], several tuning methods are published within the lowpass and bandpass filters.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A 6th-Order Current-Mirror-Based Gm-C Bandpass Filter with the Binary Searching Calibration Scheme for Capacitor Sensing Applications

Chen,

Chou,

et al. 2024

Preprint

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This paper presents the current-mirror-based Gm-C bandpass filter with a digitally binary searching calibration scheme. The current-mirror-based circuit technique can be a highly regular structure, which drives the proposed filter to implement the conceptions of the modularized unit and repeatable layout. Furthermore, it employs a tunable bias current circuit and a successively counting logic to implement the binary searching calibration scheme to reduce the mass test timing budget and to obtain the correct frequency response. Thus, the proposed 6th-order current-mirror-based Gm-C bandpass filter can overcome the PVT variations with this automatically tunable bias scheme. Accordingly, a Gm-C LC oscillator, which forms the same unit cell as the filter, generates the oscillated clock for this digital successively counting calibration scheme. This work is designed and implemented in the 0.18μm CMOS process with a supply voltage of 1.8V. The specifications include the center frequency of 200kHz and bandwidth of 100kHz for capacitor sensing applications. The measured power dissipations of the filter and calibrating scheme are 0.65mW and 0.56mW, respectively. After calibrating, the mean offset and standard deviation ratios to the calibrated clock frequency are only 2.1% and 1.66%, respectively.

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Section: Calibration Circuits Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A 6th-Order Current-Mirror-Based Gm-C Bandpass Filter with the Binary Searching Calibration Scheme for Capacitor Sensing Applications

Chen,

Chou,

et al. 2024

Preprint

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“…The simplicity of the structure is an essential advantage of Elliptic filters. In a study [ 73 ] which needs an active bandpass filter for the fifth-order OTA, the stopband frequencies of different orders of the Butterworth filter, Chebyshev filter, and Elliptic filter were measured. When reaching the same stopband frequency, the order required by the Elliptic filter is much smaller than that of the Butterworth filter and slightly smaller than that of the Chebyshev filter.…”

Section: Signal Conditioningmentioning

confidence: 99%

Progress in Data Acquisition of Wearable Sensors

Liu

Kong

et al. 2022

Biosensors

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Wearable sensors have demonstrated wide applications from medical treatment, health monitoring to real-time tracking, human-machine interface, smart home, and motion capture because of the capability of in situ and online monitoring. Data acquisition is extremely important for wearable sensors, including modules of probes, signal conditioning, and analog-to-digital conversion. However, signal conditioning, analog-to-digital conversion, and data transmission have received less attention than probes, especially flexible sensing materials, in research on wearable sensors. Here, as a supplement, this paper systematically reviews the recent progress of characteristics, applications, and optimizations of transistor amplifiers and typical filters in signal conditioning, and mainstream analog-to-digital conversion strategies. Moreover, possible research directions on the data acquisition of wearable sensors are discussed at the end of the paper.

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“…Active RC-filters (ARCF) are widely used in radio engineering, measuring equipment and automation [1][2][3]. The implementation of high-precision analog signal conversion in frequency selection devices requires the use of precision elements or calibration procedures using electronic components with controlled characteristics [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. Digital-to-analog converter (DAC) [22][23][24][25][26] or digital potentiometer (DP) [27][28][29][30][31][32][33][34][35][36][37][38] can be selected as adjustment elements.…”

Section: Introductionmentioning

confidence: 99%

Digital Potentiometers and Digital-to-Analog Converters in Tasks for Tuning Of Active RC-Filters

Butyrlagin¹,

Титов²,

Kleimenkin³

et al. 2021

Preprint

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The most popular schemes of digital potentiometers (DP) and digital-to-analog converters (DAC) are considered. DP and DAC use how elements of parameter adjustment of active RC-filters. The circuits of the DAC on the Kelvin-Varley divider, the Kelvin divider based on the R-2R matrix, and the architecture of the DAC with a segmented circuit are shown. The internal structure of DP an Analog Devices and Intersil company is shown, and also the DP switching circuits in a tunable low-pass filter and a band-pass filter, a programmable inverting amplifier and a voltage regulator are presented.

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Gm-C filter with automatic calibration scheme

Cited by 5 publications

References 9 publications

A 6th-Order Current-Mirror-Based Gm-C Bandpass Filter with the Binary Searching Calibration Scheme for Capacitor Sensing Applications

A 6th-Order Current-Mirror-Based Gm-C Bandpass Filter with the Binary Searching Calibration Scheme for Capacitor Sensing Applications

Progress in Data Acquisition of Wearable Sensors

Digital Potentiometers and Digital-to-Analog Converters in Tasks for Tuning Of Active RC-Filters

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