Attenuation-Predistortion Linearization of CMOS OTAs With Digital Correction of Process Variations in OTA-C Filter Applications

Mobarak, Mohamed; Onabajo, Marvin; Silva-Martí­nez, J.; Sánchez-Sinencio, E.

doi:10.1109/jssc.2009.2037476

Cited by 87 publications

(26 citation statements)

References 25 publications

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“…. Compared to previous work we achieve either a much higher linearity [5], or a lower noise level [6] and lower power consumption. Compared to the most similar filter in [2] we obtain over 3dB higher SFDR at lower power consumption, while not needing a regulated supply.…”

mentioning

confidence: 72%

5.5 A forward-body-bias tuned 450MHz Gm-C 3^rd-order low-pass filter in 28nm UTBB FD-SOI with >1dBVp IIP3 over a 0.7-to-1V supply

Lechevallier

Struiksma

Sherry

et al. 2015

2015 IEEE International Solid-State Circuits Conference - (ISSCC) Digest of Technical Papers

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Due to the absence of internal nodes, inverter-based Gm-C filters [1,2] allow achieving bandwidths beyond what is possible with opamp-RC techniques. The inverter's class-AB behavior, together with the high transconductance per quiescent current, results in a high dynamic range per power when optimally biased [3]. The major disadvantage of traditional inverter-based Gm-C filters is that they are tuned with the supply voltage (VDD), hence requiring a finely controllable supply. Voltage regulators used to accomplish this imply a voltage headroom (including margin for tuning) and degrade total power efficiency by tens of percent. In this paper, we show that by exploiting body biasing in an Ultra-Thin BOX and Body, Fully-Depleted SOI (UTBB FD-SOI) CMOS technology, we overcome the requirement for a tunable VDD in inverter-based Gm-C filters, while achieving a high linearity over a wide supply voltage range. Without body biasing, Gm changes and linearity is degraded. For high VDD, the inverter behavior is compressive (mobility reduction), while for low VDD it is expansive (exponential region). Only one VDD results in a flat Gm-curve, which means that it produces little 3rd order distortion. Body biasing can be applied to tune Gm back to its nominal value over different VDD, without linearity degradation, as illustrated in the bottom right plot of Fig. 5.5.1. We apply this technique to a low-pass (LP) Gm-C filter to keep the cut-off frequency (Fc) constant and to guarantee high linearity over a 300mV supply voltage range. Local supply decoupling is still required, but the separate voltage regulator can be omitted. Without this technique, the same supply variation would have shifted the cut-off frequency between 110 and 650MHz and degraded IIP3 by more than 10dB.The LP filter topology shown in Fig. 5.5.2 is derived from a 3rd order, doubly terminated Butterworth LC ladder prototype using gyrator synthesis [1]. The transconductors and MOM capacitors are sized for a nominal Fc of 450MHz. The use of 110nm gate

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confidence: 72%

5.5 A forward-body-bias tuned 450MHz Gm-C 3^rd-order low-pass filter in 28nm UTBB FD-SOI with >1dBVp IIP3 over a 0.7-to-1V supply

Lechevallier

Struiksma

Sherry

et al. 2015

2015 IEEE International Solid-State Circuits Conference - (ISSCC) Digest of Technical Papers

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“…In contrary, the active-RC and MOSFET-C configurations use local feedback around the active elements, thus need much more power consumption to operate in high frequencies. However, the open loop operation of OTAs leads to more nonlinearity in Gm-C filters and demands for highly linear OTAs [12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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

Rezaei

Azhari

2015

Microelectronics Journal

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“…For example, in an envelope detector [6], analog-to-digital converter (ADC), and digital signal processor is used for the calibration. In [7][8][9][10][11][12][13] in addition, it puts forward the evaluation of the output spectrum of the envelope detector output connected to reduce the extraction of the third order distortion, which requires a single chip implementation of FFT engine.…”

Section: Introductionmentioning

confidence: 99%

Research on the Optimization and Ascension of Target Accuracy for RF Systems

Liu¹

2015

Proceedings of the 2015 International Conference on Electrical, Computer Engineering and Electronics

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Abstract.A digital built-in calibration (BIC) system is presented to automatically adjust the linearity performance of a tunable RF low-noise amplifier (LNA) operating at 2.4GHz. In this paper, we conduct research on optimization and ascension of target accuracy for RF systems. To minimize the area and power overhead of the system, an envelope detector was employed to reduce the speed of operation for the ADC and digital blocks, and an efficient IM3 estimation method has been developed. Closed-loop simulations of this calibration system and a low-noise amplifier with digitally-tunable third-order linearity performance showed the feasibility of the synthesized digital blocks in standard CMOS technology. The experimental result proves the effectiveness of proposed method.

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Attenuation-Predistortion Linearization of CMOS OTAs With Digital Correction of Process Variations in OTA-C Filter Applications

Cited by 87 publications

References 25 publications

5.5 A forward-body-bias tuned 450MHz Gm-C 3^rd-order low-pass filter in 28nm UTBB FD-SOI with >1dBVp IIP3 over a 0.7-to-1V supply

5.5 A forward-body-bias tuned 450MHz Gm-C 3^rd-order low-pass filter in 28nm UTBB FD-SOI with >1dBVp IIP3 over a 0.7-to-1V supply

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

Research on the Optimization and Ascension of Target Accuracy for RF Systems

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Attenuation-Predistortion Linearization of CMOS OTAs With Digital Correction of Process Variations in OTA-C Filter Applications

Cited by 87 publications

References 25 publications

5.5 A forward-body-bias tuned 450MHz Gm-C 3rd-order low-pass filter in 28nm UTBB FD-SOI with >1dBVp IIP3 over a 0.7-to-1V supply

5.5 A forward-body-bias tuned 450MHz Gm-C 3rd-order low-pass filter in 28nm UTBB FD-SOI with >1dBVp IIP3 over a 0.7-to-1V supply

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

Research on the Optimization and Ascension of Target Accuracy for RF Systems

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Product

Resources

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5.5 A forward-body-bias tuned 450MHz Gm-C 3^rd-order low-pass filter in 28nm UTBB FD-SOI with >1dBVp IIP3 over a 0.7-to-1V supply

5.5 A forward-body-bias tuned 450MHz Gm-C 3^rd-order low-pass filter in 28nm UTBB FD-SOI with >1dBVp IIP3 over a 0.7-to-1V supply