A 6-bit Phase Shifter at E-band Using a Feedback-Controlled Variable Attenuator

Ross, Tyler; Tiller, Sam; Ansari, Kimia T.; Repeta, Morris

doi:10.23919/eumc.2018.8541641

Cited by 11 publications

(6 citation statements)

References 6 publications

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“…Since our system is intended to support a time division multiplexing (TDD) system, RF switches are connected to antenna so that the antennas are shared between Rx and Tx. More details regarding the design of mm-wave building blocks can be found in [36]- [38]. The size of the AA ASIC is measured as 4.4 × 6.8 mm 2 , where the power consumption of the eight Tx chains is 1 W, and that of the eight Rx chains is 0.5 W.…”

Section: A Aa Asicmentioning

confidence: 99%

“…2 has 32 subarrays on the top side, and four AA ASIC and one UDC ASIC on the bottom side. The AA ASIC includes eight TRX channels, mm-wave splitter/combiner and associated control for the LNA, PA, 6-bit PS [36]- [38] and variable gain amplifiers controlled using an SPI interface. The UDC ASIC receives/transmits IF signal from the baseband module, and upconverts/downconverts E-Band to/from AA.…”

Section: A Test Systemmentioning

confidence: 99%

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A Scalable 256-Elements E-Band Phased-Array Transceiver for Broadband Communication

Li¹,

Zhai²,

Repeta³

et al. 2021

Preprint

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For E-band wireless communications, a high gain steerable antenna with sub-arrays is desired to reduce the implementation complexity. This paper presents an E-band communication link with 256-elements antennas based on 8elements sub-arrays and four beam-forming chips in silicon germanium (SiGe) bipolar complementary metal-oxidesemiconductor (BiCMOS), which is packaged on a 19-layer low temperature co-fired ceramic (LTCC) substrate. After the design and manufacture of the 256-elements antenna, a fast near-field calibration method is proposed for calibration, where a single near-field measurement is required. Then nearfield to far-field (NFFF) transform and far-field to near-field (FFNF) transform are used for the bore-sight calibration. The comparison with high frequency structure simulator (HFSS) is utilized for the non-bore-sight calibration. Verified on the 256elements antenna, the beam-forming performance measured in the chamber is in good agreement with the simulations. The communication in the office environment is also realized using a fifth generation (5G) new radio (NR) system, whose bandwidth is 400 megahertz (MHz) and waveform format is orthogonal frequency division multiplexing (OFDM) with 120 kilohertz (kHz) sub-carrier spacing.

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Section: A Aa Asicmentioning

confidence: 99%

Section: A Test Systemmentioning

confidence: 99%

A Scalable 256-Elements E-Band Phased-Array Transceiver for Broadband Communication

Li¹,

Zhai²,

Repeta³

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…The most common approaches using SiGe for designing a VM are variable gain amplifiers (VGAs) in combination with multiple coupler paths or switching elements [32], [33], [34], [35], [36], [37], Gilbert Cells (GCs) with analog tuning voltages [38], [39], [40], [41], [42], [43], [44], [45], [46], [47], [48], [49], [50], and reflection type phase-shifters [51], [52], [53], [54]. Besides that, GCs with on-chip digital-analog converters (DACs) [55], [56], switchable delay lines [57], modified Doherty amplifier [58], modified GCs [59], and tunable attenuators [60] have been presented. Moreover, there are many published BPSK modulator circuits [61], [62], [63], [64].…”

Section: Introductionmentioning

confidence: 99%

Compact and Digitally Controlled D-Band Vector Modulator for Next-Gen Radar Applications in 130 nm SiGe BiCMOS

2023

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Radar systems got very popular in sensing applications in the last two decades besides the traditional military sector. Nowadays, many applications favor multiple-input multiple-output (MIMO) radar over phased-array radar. Here, time-division multiplexing (TDM) and code-division multiplexing (CDM), like a phase-modulated continuous wave (PMCW), are well-known techniques. However, every method needs special components on the MMIC. In this article, a 125 GHz vector modulator (VM) circuit is presented, which can operate as a switchable amplifier in TDM systems, as a binary-phase modulator in CDM systems, and as a phase-shifter in phased-array systems. Based on simulations and S-parameter measurements, the VM itself and the three different operating modes are analyzed. We also present a technique to separate coupler imperfections from the S-parameter measurements to analyze the VM separately. We designed the VM with the B11HFC silicon-germanium technology ( f t / f max = 250/370 GHz), using both HBTs (heterojunction bipolar transistors) and CMOS transistors. Inside the VM, two cross-connected power amplifiers (PAs) are fed by an in-phase (I), and two cross-connected PAs are fed by a quadrature-phase (Q) signal. The four PAs are controlled by a 4-bit interface to switch them on or off, thus generating output signals in the range of 0 • to 360 • .

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“…Variable power amplifiers and multiple couplers [30]- [35], switchable delay lines [36], [37], or reflection-type phase shifters [38]- [42] can also be used to manipulate the output phase such that the beam of the array can be steered. There are also approaches with Doherty amplifiers [43] and tuneable attenuators [44].…”

Section: Introductionmentioning

confidence: 99%

A D-Band Vector Modulator for Imaging Applications in 130nm SiGe

Wittemeier¹,

Pohl²

2023

Preprint

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<p>Radar-based 3D sensing applications are increasingly used today to locate objects. Besides automotive and military applications, the number of civil and security applications also expands. However, numerous antennas are required for detailed 3D images, which impacts the sensor size. Higher center frequencies can reduce the antenna spacing and, thus, the array size. Alternatively, the array size can be kept the same to increase the number of antennas and, thus, the spatial resolution. </p> <p>3D detection with an FMCW radar is only possible when the antenna beam is spatially steered (e.g., phased-array radar), or digital beam-forming is performed (multiple-input multiple-output (MIMO) radar). This paper presents a 125 GHz vector modulator (VM) that can either shift the phase for phased-array operation or turn individual transmit channels on or off for time-division MIMO. The VM was fabricated using the B11HFC technology from Infineon Technologies AG and consists of 4 compactly interconnected power amplifiers (PAs): Two are fed with an in-phase (I) signal, and two are fed with a quadrature (Q) signal. Within the pairs, the PAs are each cross-connected to a common inductive load such that the I and Q signals can be inverted. Thus, output phases between 0° and 360° are possible. </p>

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A 6-bit Phase Shifter at E-band Using a Feedback-Controlled Variable Attenuator

Cited by 11 publications

References 6 publications

A Scalable 256-Elements E-Band Phased-Array Transceiver for Broadband Communication

A Scalable 256-Elements E-Band Phased-Array Transceiver for Broadband Communication

Compact and Digitally Controlled D-Band Vector Modulator for Next-Gen Radar Applications in 130 nm SiGe BiCMOS

A D-Band Vector Modulator for Imaging Applications in 130nm SiGe

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