Mixer-First MIMO Receiver With Reconfigurable Multi-Port Decoupling and Matching

Wilson, Charley; Dean, Jacob; Floyd, Brian

doi:10.1109/jssc.2020.2967552

Cited by 5 publications

(3 citation statements)

References 16 publications

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“…Works [Wil18] and [Wil20] describe techniques within mixer-first receivers that can provide a multi-port input match to a multi-antenna system. This is shown to improve capacity MIMO system, even if elements are closely spaced.…”

Section: Future Work -Multi-port Matching At Millimeter-wavementioning

confidence: 99%

RF-to-Millimeter-Wave Receivers Employing Frequency-Translated Feedback

Dean,

Hari,

Floyd

2024

IEEE J. Solid-State Circuits

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DEAN, JACOB THOMAS. RF to Millimeter-Wave Receivers Employing Frequency-Translated Feedback. (Under the direction of Brian A. Floyd).Demand for wireless data is constantly increasing, and to accommodate this trend, systems are moving to both wider bandwidths and higher frequencies where more bandwidth is available. Meanwhile, communication systems are evolving toward topologies with many transmit (TX) or receive (RX) elements, greatly increasing the total throughput of a system by using diversity, spatial multiplexing, and beamforming techniques. In particular, there is much interest in the development of frequency-selective digital beamforming receiver arrays for both communication and sensing. This work aims to develop new RX techniques suitable for use as a software-defined radio (SDR) or at the element level in a digital phased-array system. For such applications, an RX should operate across a wide range of radio frequencies (RF) and support wide instantaneous bandwidths, enabling high data rates. Since spectrum is becoming increasingly crowded, it should be frequency selective at the desired channel and it must be tolerant of out-of-band blockers which may have very high power levels. Power consumption must be carefully managed and dynamic range should be maximized. A receiver with these characteristics could be an invaluable tool for engineers and researchers in a variety of fields.In this work, a new receiver topology is introduced which leverages frequency-translated feedback to set input match. The resulting receiver has the potential to achieve lower noise figure and a wider impedance tuning range than existing methods. Chapter 1 will provide motivation for this work, followed by a brief discussion of beamforming topologies. After this, important figures of merit are defined which will be used as objectives for the rest of this work. With these objectives in mind, the state of the art in integrated RX design will be surveyed. Two common receiver topologies, the low noise amplifier (LNA)-first receiver and the mixer-first receiver, are identified and the benefits and drawbacks of each are discussed. Finally, this chapter provides a survey of the use of frequency-translated feedback within RF systems followed by an overview of the rest of this dissertation.Chapter 2 presents a new RX topology which combines attributes from both the LNAfirst and mixer-first receivers, seeking to leverage the strengths of each. The new RX uses an LNA for good noise performance, followed by a downconversion mixer and baseband amplifiers. Input match is set using frequency-translated feedback to the RF port, which is upconverted from baseband outputs. A wideband linear, time-invariant (LTI) model of the RX is introduced, and this model is used to describe receiver behavior with regard to loop gain, conversion gain, stability, input impedance and noise. This theory shows agreement with simulation results across harmonics and serves to guide design. Chapter 3 describes the design and measurement of a first hardware prototype im...

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Section: Future Work -Multi-port Matching At Millimeter-wavementioning

confidence: 99%

RF-to-Millimeter-Wave Receivers Employing Frequency-Translated Feedback

Dean,

Hari,

Floyd

2024

IEEE J. Solid-State Circuits

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“…The use of N-path RX for MIMO is also demonstrated in [57] to accomplish mutual impedance tuning in a mixer-first MIMO RX. Variable impedance networks are introduced the couple the baseband of different elements in the MIMO RX together and the N-path RX translates the coupling to RF input.…”

Section: Reconfigurable Walsh-function Based Spatio-spectral Filtering For Interferer-rejection In Mimo Arraysmentioning

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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“…Such receivers with the passive mixer as their first block are called mixer-first receivers, and the filtering property associated with such mixers, i.e., frequencytranslating the low-pass filter at their baseband terminal to bandpass filter at their RF terminal, is called N-path filtering [40]. Since their introduction in 2006, various architectures of the mixer-first receivers [41,34,42,43,17,44,45,18,46,47,48,49,50,51,52,53,54,55,56,57,58] have been proposed to achieve high linearity. Since this work also proposes a mixer-first receiver, the main properties of the mixer-first receivers are briefly discussed along with the relevant literature.…”

Section: Low-passmentioning

confidence: 99%

Wide band linearization techniques for RF receiver front-ends

Bhat

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Mixer-First MIMO Receiver With Reconfigurable Multi-Port Decoupling and Matching

Cited by 5 publications

References 16 publications

RF-to-Millimeter-Wave Receivers Employing Frequency-Translated Feedback

RF-to-Millimeter-Wave Receivers Employing Frequency-Translated Feedback

Recent Developments in Integrated Interferer-Tolerant Receivers for Reconfigurable Radios

Wide band linearization techniques for RF receiver front-ends

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