A Fully Passive RF Front End With 13-dB Gain Exploiting Implicit Capacitive Stacking in a Bottom-Plate N-Path Filter/Mixer

Purushothaman, Vijaya Kumar; Klumperink, Eric A.M.; Clavera, Berta Trullas; Nauta, Bram

doi:10.1109/jssc.2019.2959489

Cited by 44 publications

(40 citation statements)

References 29 publications

(56 reference statements)

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“…Although [12], [20] achieve a better noise figure by employing the RF noisecanceling technique, their Rx power consumption is much higher than the proposed work. The proposed receiver has achieved a wider frequency tuning range with similar noise performance as compared to recent discrete-time mixer-first receivers [16], [22]. Overall, the mixer-first receiver presented in this work achieved a good in-band SFDR while consuming the lowest Rx power.…”

Section: Measurementsmentioning

confidence: 69%

A Four-Phase Passive Mixer-First Receiver With a Low-Power Complementary Common-Gate TIA

Das

Nallam

2020

IEEE Access

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This paper presents a four-phase passive mixer-first receiver using a common-gate (CG) trans-impedance amplifier (TIA), instead of a conventional shunt-feedback amplifier. The four-transistor TIA used in this work combines current-reuse with cross-coupled g m-boosting to achieve a reduced noise figure (NF) at low power levels. Moreover, complementary derivative-superposition (CDS) linearization within the TIA helps to improve the linearity with no additional power overhead. A prototype receiver is implemented in a 180 nm CMOS technology. The receiver operates from 0.3 to 1.3 GHz with a conversion gain of 21.9 dB. In measurements, the receiver achieved a noise figure of 5.8 dB and an in-band (IB) IIP3 of +7.2 dBm while consuming 0.34 mW power per TIA at 1 GHz. The measured spurious-free dynamic range (SFDR) at 1 GHz is 76.9 dB. INDEX TERMS Common-gate trans-impedance amplifier (TIA), current-reuse, g m-boosting, low-power, mixer-first, N-path filter, passive mixer, tunable, wideband.

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Section: Measurementsmentioning

confidence: 69%

A Four-Phase Passive Mixer-First Receiver With a Low-Power Complementary Common-Gate TIA

Das

Nallam

2020

IEEE Access

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“…The bottom-plate readout scheme in addition to an implementation in 22 nm FDSOI technology and a 2:1 transformer between the mixer and the antenna enables low noise figure with small switch size and consequently low power consumption. The implementation in [37] achieves 5 dB-9 dB NF and 25 dBm OOB IIP 3 from 0.6 GHz to 1.2 GHz operation while consuming only 600 μW power, demonstrating the promise of mixer-first N-path RX for low-power IoT applications.…”

Section: Reconfigurable Interferer-tolerant N-path Filters and Mixer-first Receiversmentioning

confidence: 94%

“…The RX supports operation from 0.1-2.0 GHz with a noise-figure of 6.3 dBm for operation at LO frequency of 1 GHz. The bottom-plate N-path architecture is further extended in [37] where the bottom plate voltage of the N-path mixer capacitors is connected to NOP-driven switches for readout. A 180 •phase shift in the readout switches leads to a 2x voltage boost equivalent to a passive-voltage boost.…”

Section: Reconfigurable Interferer-tolerant N-path Filters and Mixer-first Receiversmentioning

confidence: 99%

Recent Developments in Integrated Interferer-Tolerant Receivers for Reconfigurable Radios

et al. 2021

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Fragmented spectrum allocations at RF and mm-Wave, increased use of carrier aggregation/MIMO and dense spectrum-reuse in wireless links has led to interest in the design of integrated wideband, high-linearity MIMO RX that provide low noise, blocker tolerance and reconfigurability across signal domains. In this paper, receive architectures for wide operating range and blocker tolerance are presented with a focus on recent developments in reconfigurable N-path receivers. Generalized sequence-mixing architectures that support reconfigurable frequency/spatial/code-domain rejection and filtering are described along with directions of research extending operation to wider bandwidths and higher frequencies.INDEX TERMS N-path filters, reconfigurable receivers, current-mode, passive mixers, sequence mixers, spatio spectral filtering, walsh function sequence based notch filters, blocker tolerant receivers, blocker tolerant MIMO, interference tolerant receivers.This article has been accepted for inclusion in a future issue of this journal. Content is final as presented, with the exception of pagination.

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“…A fully-passive sub-mW mixer-first receiver front-end [13] front-end that we proposed in [13]. As shown in Fig 7, the front-end employs a 4-path differential bottom-plate filter/mixer with RF capacitors (C R ) and baseband capacitors (C B ) and an off-chip step-up transformer [13]. The filtered RF voltage in the differential 4-path filter is sensed from the bottom-plate terminals N 1−8 of the C R capacitors for down-conversion.…”

Section: Cross-correlation Based Bfsk Receiver Set-upmentioning

confidence: 99%

“…The effect of multi-receiver XC on the bit error rate of BFSK receivers is mathematically analysed in [8], but without experimental verification. In this work, we implemented the multi-receiver XC technique in a BFSK receiver using state-of-the-art sub-mW front-end, designed for IoT applications [13] and evaluated experimentally the improvement in sensitivity and harmonic interferer tolerance of the receiver. We also show that multi-receiver XC consumes less energy to generate the same number of useful cross-power spectrum samples than a two-path XC.…”

Section: Introductionmentioning

confidence: 99%

Multi-Receiver Cross-Correlation Technique for (B)FSK Radios

Purushothaman

Mikhael²,

Alink

et al. 2021

IEEE Access

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This article presents a multi-receiver cross-correlation technique for (B)FSK receivers, targeting wireless sensor network applications. Here, multiple receiver outputs are pair-wise cross-correlated and the correlated output samples are averaged to lower the noise floor at the receiver output. Compared to a two-receiver cross-correlation, multi-receiver cross-correlation generates more cross-correlated output samples in a given time. Hence it requires a shorter measurement time for a desired noise floor reduction and facilitates a higher data rate for (B)FSK operation. Compared to a single receiver, it improves the linearity and the harmonic interferer tolerance using passive splitters and different LO frequencies in the receiver paths respectively. These theoretical insights are verified with measurements for the first time using a 2and 3-receiver cross-correlation in a BFSK receiver. Operating at 1 GHz and with a data rate of 200 kbps, the demonstrator, using sub-mW mixer-first receiver front-ends for power efficiency, achieves −102 dBm sensitivity and > 40 dB rejection for both narrow and wideband harmonic interferers without any RF filters.

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A Fully Passive RF Front End With 13-dB Gain Exploiting Implicit Capacitive Stacking in a Bottom-Plate N-Path Filter/Mixer

Cited by 44 publications

References 29 publications

A Four-Phase Passive Mixer-First Receiver With a Low-Power Complementary Common-Gate TIA

A Four-Phase Passive Mixer-First Receiver With a Low-Power Complementary Common-Gate TIA

Recent Developments in Integrated Interferer-Tolerant Receivers for Reconfigurable Radios

Multi-Receiver Cross-Correlation Technique for (B)FSK Radios

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