A new controllable adaptive biasing linearization technique for a CMOS OTA and its application to tunable Gm-C filter design

Rezaei, Farzan; Azhari, Seyed Javad

doi:10.1016/j.mejo.2015.06.012

Cited by 18 publications

(4 citation statements)

References 33 publications

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“…A transconductor that exploits adaptive biasing through feedback has been presented by Chilakapati in [16]. Several Authors [13], [15], [18], [20] have presented adaptively biased transconductors where the bias current is proportional to the squared input differential voltage, to linearize the V/I characteristic according to the quadratic law behavior of MOS devices. Sengupta in [17] proposed an adaptively biased transconductor based on a differential pair where the tail current source MOS devices are driven by a copy of the input signal.…”

Section: Introductionmentioning

confidence: 99%

A class-AB linear transconductor with enhanced linearity

Bocciarelli

Centurelli

Monsurrò

et al. 2021

AEU - International Journal of Electronics and Communications

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Section: Introductionmentioning

confidence: 99%

A class-AB linear transconductor with enhanced linearity

Bocciarelli

Centurelli

Monsurrò

et al. 2021

AEU - International Journal of Electronics and Communications

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“…Several techniques about increasing the linear range [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] have been proposed in the literature, based on source generation, adaptive biasing, pseudo-differential stages, cross-coupling, multiple differential pairs, current cancellation, and the combination of some of them. Other technique is the use of bulkdriven differential pair to enhance the linear range of OTA [3,4,[11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Biasing technique to improve total harmonic distortion in an ultra‐low‐power operational transconductance amplifier

Sánchez

Moreno

Ferreira

et al. 2019

IET Circuits, Devices & Systems

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This study presents a new technique based on large signal analysis, to enhance the total harmonic-distortion (THD) in an ultra-low-power operational transconductance amplifier (OTA). The proposed technique is used to implement an ultra-lowpower gate-driven and bulk-driven OTA with high linear range. Mismatch and post-layout simulations in 0.13 μm CMOS technology demonstrate that the proposed technique can improve the THD and the dynamic range, without affecting the transconductance tuning and the common-mode control. It achieves a 183 and 640 mVpp linear ranges for gate-driven and bulk-driven OTA, and a 61.8 dB dynamic range at 0.5 V with 26.35 nW power dissipation.

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“…This means that the linearity would not be maintained throughout the tuning range. In [30], using a power consuming auxiliary circuit that controls the biasing tail current of differential pair, the linearity of OTA is improved in a limited range of transconductance values.…”

Section: Introductionmentioning

confidence: 99%

Adaptive cancellation linearisation and its application to wide‐tunable Gm‐C filter design

Rezaei

2017

IET Circuits, Devices & Systems

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This paper presents an adaptive g m3 cancellation for linearisation of operational transconductance amplifier (OTA) and its application to design of a wide tunable Gm-C filter. g m3 cancellation through paralleling triode-and subthreshold-mode transconductors makes good linearisation, but only in a limited range of tuning voltage. An auxiliary circuit is employed to adaptively change the operating point of subthreshold-mode transconductor such that to keep linearisation throughout the tuning range. By this way, the linearity of OTA is significantly improved in overall transconductance tuning range from 18 to 289 μA/V. While by applying 0.6 Vpp input voltage at 1 MHz the total harmonic distortion (THD) of conventional OTA lies between −75.1 and −44.4 dB, it reduces to lie between −83.3 and −57.4 dB in the proposed OTA. Using the proposed OTA, a third-order low-pass Gm-C filter is designed in 0.18 μm CMOS technology. The cutoff frequency of filter is tunable from 1.73 to 27.25 MHz, thus, can be applicable to support WCDMA, WLAN (IEEE 802.11a/b/g/n) and WiMAX standards in multi-mode direct conversion receivers. The third-order intercept point of filter is between 7.1 and 13.7 dBm in different tuning conditions.

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A new controllable adaptive biasing linearization technique for a CMOS OTA and its application to tunable Gm-C filter design

Cited by 18 publications

References 33 publications

A class-AB linear transconductor with enhanced linearity

A class-AB linear transconductor with enhanced linearity

Biasing technique to improve total harmonic distortion in an ultra‐low‐power operational transconductance amplifier

Adaptive cancellation linearisation and its application to wide‐tunable Gm‐C filter design

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