All-Digital Adaptive Module for Automatic Background IIP2 Calibration in CMOS Downconverters With Fast Convergence

Jiang, Peichen; Lu, Zhenghao; Guan, Rui; Zhou, Jianjun

doi:10.1109/tcsii.2013.2261171

Cited by 7 publications

(7 citation statements)

References 8 publications

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“…Moreover, in ISM standard applications, using a 1.2 GHz frequency oscillator, the 2.41 GHz RF signal is transmitted to the baseband frequency of 10 MHz. 5 The IIP3 simulation results of the proposed and conventional mixer are illustrated in Figure 12 which indicates that the IIP3 of proposed and conventional mixers are 21 and 3 dBm respectively. This figure shows that the proposed mixer has improved IIP3 about 18 dBm with respect to conventional mixer.…”

Section: Simulation Resultsmentioning

confidence: 96%

“…Coefficients of Volterra expansion of output current can be derived by comparing Equations (1), (3), and (5).…”

Section: A the Proposed Im3 Cancelation Techniquementioning

confidence: 99%

“…But there is an additional stage of the transistor that this structure is not suitable for low-voltage applications. Also, in Jiang et al 5 and Brandolini et al, 6 several calibration techniques have been introduced to address the IIP2 obstacle which is often complex and power hungry. Besides, the other linearization technique is proposed in Lou and Loung 7 and Vahidfar and Shoaei 8 that low frequency of IM2 is generated and injected to suppress only the IM3.…”

Section: Introductionmentioning

confidence: 99%

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Design and analysis of high linearity mixer using subharmonic technique

Modanlou

Naimi

Gholami

2018

Circuit Theory & Apps

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In this article, a new technique for reducing second-order and third-order intermodulation (IM2 and IM3) for an output current of the subharmonic mixer is presented. First, to reduce second-order and third-order of the Volterra's kernel, IM2 current injection technique has been used. By the auxiliary path, the IM2 current which has been generated in the doubler with the phase difference of 180°relative to inherent IM2 of the output is injected into the output node.Also, this produced IM2 in the frequency doubler has been injected into the circuit by another auxiliary path, so that, in the output, an IM3 with opposite phase of inherent IM3 of the output mixer's current is presented. Besides, to easier design, the Volterra series expansion is used and equations related to Volterra kernels of the output current are extracted. Furthermore, the noise of the auxiliary path transistors connected to the output can be neglected because of the small g m of their transistors compared to the main path. The results of simulations by ADS simulator in 0.18-μm TSMC technology show that the proposed technique has simultaneously improved the values of IIP3 and IIP2 up to 21 and 92 dBm, compared to conventional subharmonic mixers. KEYWORDSGilbert cell mixer, subharmonic mixer, high linearity, second-order and third-order input intercept point (IIP2, IIP3), second-order and third-order intermodulation (IM2, IM3)

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Section: Simulation Resultsmentioning

confidence: 96%

“…Coefficients of Volterra expansion of output current can be derived by comparing Equations (1), (3), and (5).…”

Section: A the Proposed Im3 Cancelation Techniquementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Design and analysis of high linearity mixer using subharmonic technique

Modanlou

Naimi

Gholami

2018

Circuit Theory & Apps

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“…Several calibration techniques have been presented to address the IIP2 problem. However, they are often complex and power hungry [12,13]. Using analog techniques and optimizing the mixer for an improved IIP2 performance are other approaches [14,15].…”

Section: Introductionmentioning

confidence: 99%

Second‐order intermodulation cancelation and conversion‐gain enhancement techniques for CMOS active mixers

Asghari

Yavari

2014

Circuit Theory & Apps

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Summary In this paper, two new techniques are proposed to improve the second‐order input intercept point (IIP2) and conversion‐gain in double‐balanced Gilbert‐cell complementary metal‐oxide semiconductor (CMOS) mixers. The proposed IIP2 improvement technique is based on canceling the common‐mode second‐order intermodulation (IM2) component at the output current of the transconductance stage. Additionally, the conversion‐gain is improved by increasing the fundamental component of the transconductance stage output current and creating a negative capacitance to cancel the parasitic capacitors. Moreover, in the proposed IM2 cancelation technique, by decreasing the bias current of the switching transistors, the flicker noise of the mixer is reduced. The proposed mixer has been designed with input frequency and output bandwidth equal to 2.4 GHz and 20 MHz, respectively. Spectre‐RF simulation results show that the proposed techniques simultaneously improve IIP2 and conversion‐gain by approximately 23.2 and 5.7 dB, respectively, in comparison with the conventional mixer with the same power consumption. Also, the noise figure (NF) at 20 kHz, where the flicker noise is dominant, is reduced by 4.9 dB. The average NF is increased nearly 0.9 dB, and the value of third‐order input intercept point (IIP3) is decreased approximately 1.8 dB. Copyright © 2014 John Wiley & Sons, Ltd.

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“…Many calibration techniques have been presented to address IIP2 problem. However, they are complex and power hungry [6,7]. Using analog techniques and optimizing the mixer for IIP2 is another approach [5,8,9] Several pre-distortion, multiple gated transistor (MGTR) and feed-forward techniques have been presented to cancel the third-order transconductance [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

A high IIP2 and IIP3 CMOS down-conversion active mixer

Asghari

Yavari

2014

2014 22nd Iranian Conference on Electrical Engineering (ICEE)

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Two linearization techniques for double-balanced active mixers are introduced in this paper. The proposed techniques are based on cancelling the second-and third-order kernels of the transconductance stage output current. The second-order kernel is cancelled by adding a second-order intermodulation (IM2) current with an opposite sign generated by injecting a first-order term to the transconductance stage and also attenuating the third-order kernel of the transconductance current significantly by an improved form of the IM2 injection method. The proposed mixer has been designed for IEEE 802.11 applications with input frequency and output bandwidth equal to 2.4 GHz and 20 MHz, respectively, and simulated using a 90 nm RF-CMOS technology. Spectre-RF simulation results show that the proposed techniques have simultaneously improved IIP2 and IIP3 by approximately 26.7 dB and 21.4 dB, respectively, while only a 0.2 mA extra current is drawn from a 1.2 V power supply. In addition, the proposed techniques have no effect on the other parameters of the mixer such as the noise figure and conversion gain.

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All-Digital Adaptive Module for Automatic Background IIP2 Calibration in CMOS Downconverters With Fast Convergence

Cited by 7 publications

References 8 publications

Design and analysis of high linearity mixer using subharmonic technique

Design and analysis of high linearity mixer using subharmonic technique

Second‐order intermodulation cancelation and conversion‐gain enhancement techniques for CMOS active mixers

A high IIP2 and IIP3 CMOS down-conversion active mixer

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