A coupled-RTWO-based subharmonic receiver front-end for 5G E-Band backhaul links in 28nm bulk CMOS

Vigilante, Marco; Reynaert, Patrick

doi:10.1109/isscc.2018.8310359

Cited by 12 publications

(7 citation statements)

References 6 publications

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“…Considering now only a single isolated TL segment 6 for M = 1, as shown in Fig. 6(c), the distance stub between the maintaining amplifier and the tuning capacitor stubs (S0 and S1, respectively) causes a phase delay for the traveling wave on the TL of ψ H 1 = ψ P2 + ψ P2 , where ψ P2 is the purely propagational phase shift at point P2 on the TL, and ψ P2 is the induced excess phase delay due to the placing of the capacitive stub S1 at P2.…”

Section: Distributed Stubs Techniquementioning

confidence: 99%

“…On the local oscillator (LO) side, this could only be realistically met with an ultralow phase noise (PN) integrated jitter level of sub-100 fs in the 28-GHz band [1]- [4]. Furthermore, multiple phases are highly desired to support direct frequency conversion [5], [6], and to perform frequency multiplication [7]. As one of promising circuit topologies, a rotary traveling-wave oscillator (RTWO) has demonstrated its ability to generate multiple phases at mmW frequencies while achieving low PN [6], [8]- [16].…”

mentioning

confidence: 99%

“…Furthermore, multiple phases are highly desired to support direct frequency conversion [5], [6], and to perform frequency multiplication [7]. As one of promising circuit topologies, a rotary traveling-wave oscillator (RTWO) has demonstrated its ability to generate multiple phases at mmW frequencies while achieving low PN [6], [8]- [16]. It is worth mentioning that the ability to generate multiple phases in an RTWO is traded off against a larger occupied area as compared with conventional LC oscillators (LCOs).…”

mentioning

confidence: 99%

“…It is well-known that the quality factor (Q) degradation of tuning varactors in mmW RTWOs leads to worse PN in the thermal noise (1/ f 2 ) region [9], [14]. Many techniques have been introduced to mitigate such degradation, such as inductive loading [11], using an array of coupled oscillators [6], [9], and combining standing-wave and traveling-wave modes (hybrid RTWO) as devised in [9] and [10]. Despite those PN improvements in the 1/ f 2 region, the flicker PN (1/ f 3 ) corner of mmW RTWO appears to always exceed 1 MHz, as surveyed in Fig.…”

mentioning

confidence: 99%

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A Distributed Stubs Technique to Mitigate Flicker Noise Upconversion in a mm-Wave Rotary Traveling-Wave Oscillator

Shehata

Keaveney

Staszewski

2021

IEEE J. Solid-State Circuits

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A rotary traveling-wave oscillator (RTWO) has an ability to generate multiple phases at millimeter-wave (mmW) frequencies while achieving low phase noise (PN). Unfortunately, due to the practically unavoidable transmission line (TL) dispersion, which causes the higher-order harmonics to travel faster than the fundamental, RTWOs suffer from flicker noise upconversion. In this article, we propose a "distributed stubs" technique to mitigate this mechanism in which tuning capacitors placed on the TL stubs away from the maintaining amplifiers will slow down the travel speed of higher-order harmonics relative to the fundamental, thus lowering the phase shifts due to the TL dispersion. We further provide a comprehensive analysis of the flicker noise upconversion mechanism due to the TL dispersion. The proposed 26.2-30-GHz RTWO is implemented in 22-nm fully depleted silicon-on-insulator (FD-SOI) CMOS with eight differential phases. At 30 GHz, it achieves PN of −107.6 and −128.9 dBc/Hz at 1-and 10-MHz offsets, respectively. This translates into figures-of-merit (FoMs) of 184.2 and 185.4 dB, respectively, for a single phase. The proposed architecture consumes 20 mW from 0.8-V supply. It achieves a flicker PN corner of 180 kHz, which is an orderof-magnitude better than currently achievable by state-of-the-art mmW RTWOs.

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Section: Distributed Stubs Techniquementioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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A Distributed Stubs Technique to Mitigate Flicker Noise Upconversion in a mm-Wave Rotary Traveling-Wave Oscillator

Shehata

Keaveney

Staszewski

2021

IEEE J. Solid-State Circuits

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“…In addition, the frequency of commercial wireless communication is being increased to handle higher data rates. Millimeter‐wave frequency bands have been applied in the fifth generation wireless communication (5G) 1‐7 . However, the high operating frequency makes circuits more sensitive to parasitics.…”

Section: Introductionmentioning

confidence: 99%