A Harmonic Rejection Strategy for 25% Duty-Cycle IQ-Mixers Using Digital-to-Time Converters

Gebhard, Andreas; Sadjina, Silvester; Tertinek, Stefan; Dufrene, Krzysztof; Pretl, Harald; Huemer, Mario

doi:10.1109/tcsii.2019.2937654

Cited by 6 publications

(3 citation statements)

References 12 publications

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“…There is a growing research on programmable and reconfigurable mixer-first RF front-ends and partly this is achieved by tunable mixers and filters at the receiver RF front-end [1]- [3]. Most of these mixer-first RF front-ends [4], higher order filtering RF front-ends [5], frequency selective passive front-ends [6] employ RF sampling and they operate at a frequency close to or greater than the input RF frequency(f RF ), requiring high performance frequency synthesizers with stringent phase noise, jitter requirements leading to increased power consumption.…”

Section: Introductionmentioning

confidence: 99%

A Process Scalable Architecture for Low Noise Figure Sub-Sampling Mixer-First RF Front-End

Rena

Verma

Pasupureddi

2021

2021 IEEE International Symposium on Circuits and Systems (ISCAS)

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Sub-sampling down-conversion mixers have not been considered as a mixer-first RF front-ends due to their disadvantages of high noise figure and lack of impedance matching at the RF port, even though they offer the advantages of less complex clocking circuits and low-power consumption. In this work, a process scalable architecture for low noise figure impedance matched sub-sampling mixer-first RF front-end is proposed addressing the issues of noise folding and impedance matching with process scalable circuit components like switches, capacitors and inverters. A scheme to reject the selected IF odd-harmonics of fs/4 by multi-path sampling is proposed, alleviating the effect of noise folding and leading to low noise figure sub-sampling mixer-first RF front-end. The combination of the complex impedance band-pass filter along with the IF-LNA provide the tuned impedance matching. In addition, analysis on sub-sampling frequency plan, amount of harmonic rejection and its effect on noise figure, transparency of the impedance at the RF port and its tunability with respect to the input impedance of IF-LNA is presented. To validate the analysis and modeling, as well as to explain the architecture, an example low-power narrow-band IoT(NB-IoT) standard RF front-end is realized in 1.2 V, 65 nm CMOS and it is observed that the performance predicted by analytical equations is in agreement with Spectre RF simulations.

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Section: Introductionmentioning

confidence: 99%

A Process Scalable Architecture for Low Noise Figure Sub-Sampling Mixer-First RF Front-End

Rena

Verma

Pasupureddi

2021

2021 IEEE International Symposium on Circuits and Systems (ISCAS)

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“…An HR issue is considered irrelevant for narrowband radio along with the off-chip filtering components. However, recent trends favor the wide-band analog front-end in order to cover vastly different frequency bands and to lower the cost of the RF transceiver, especially in Long Term Evolution (LTE) [7]. Thus, blocker signals may reach the HR mixer where the harmonic alias rejection is usually in the range of 40-50 dBc only [5,6,8].…”

Section: Introductionmentioning

confidence: 99%

Analysis and Design of Harmonic Rejection Low Noise Amplifier with an Embedded Notch Filter

2020

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This paper presents the analysis and design of the harmonic rejection (HR) low-noise amplifier (LNA) with the fully passive source degeneration notch filter. The proposed HR LNA provides the rejection for the strong harmonics ( 3 r d ) of the local oscillator (LO) frequencies, where the HR mixer does not provide sufficient HR performance. The proposed 3 r d harmonic notch filter modulates the source degeneration factor and the impedance matching performance thereafter. This effect further helps the blocking of the harmonic signal. The proposed LNA provides 11 dB gain at the fundamental frequency (2.1 GHz) while rejecting the 3rd harmonic component by 37 dBc. Compared to the conventional LNA, the 3rd harmonic notch performance is improved by 23 dB. Additionally, the LNA achieves a minimum noise figure of 3.1 dB, third order input intercept point ( I I P 3 ) of 0.5 dBm, input reflection (S 11 ) below −10 dB from 1.8 GHz–2.3 GHz operational frequency range, and consumed 19 mW of power from a 1.2 V supply.

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“…The present work is intended to exploit the model possibilities, increasing the number of modulation ratios, introducing the concepts of macroperiod and duty cycle to the time modulation, with the objective of enriching the diffraction phenomenon. Furthermore, it has been shown that breaking the temporal symmetry allows the suppression of non-desired harmonics [42]. The scattering parameters are quantitatively evaluated, constituting an additional contribution with respect previous works in the literature.…”

mentioning

confidence: 98%

Time-Periodic Metallic Metamaterials Defined by Floquet Circuits

Moreno-Rodríguez,

Alex-Amor,

Padilla

et al. 2023

IEEE Access

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In this paper, we study the scattering and diffraction phenomena in time-modulated metamaterials of metallic nature by means of Floquet equivalent circuits. Concretely, we focus on a time-periodic screen that alternates between ''metal" and ''air" states. We generalize our previous approaches by introducing the concepts of ''macroperiod" and ''duty cycle" to the time modulation. This allows to analyze time-periodic metallic metamaterials whose modulation ratios are, in general, rational numbers. Furthermore, with the introduction of the duty cycle, perfect temporal symmetry is broken within the time modulation as the time screen could remain a different amount of time in metal and air states. Previous statements lead to an enrichment of the diffraction phenomenon and to additional degrees of freedom that can be exploited in engineering to control the reflection and transmission of electromagnetic waves. Finally, we present some analytical results that are validated with a self-implemented finite-difference time-domain (FDTD) approach. Results show that the scattering level and diffraction modes can be controlled independently by means of the duty cycle and the modulation ratio, respectively, leading to an efficient design of time-based pulsed sources and beamformers.INDEX TERMS Floquet circuit, FDTD, modulation ratio, macroperiod, duty cycle.

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A Harmonic Rejection Strategy for 25% Duty-Cycle IQ-Mixers Using Digital-to-Time Converters

Cited by 6 publications

References 12 publications

A Process Scalable Architecture for Low Noise Figure Sub-Sampling Mixer-First RF Front-End

A Process Scalable Architecture for Low Noise Figure Sub-Sampling Mixer-First RF Front-End

Analysis and Design of Harmonic Rejection Low Noise Amplifier with an Embedded Notch Filter

Time-Periodic Metallic Metamaterials Defined by Floquet Circuits

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