Analysis and Design of a 54 GHz Distributed “Hybrid” Wave Oscillator Array With Quadrature Outputs

Moroni, Anna; Genesi, R.; Manstretta, Danilo

doi:10.1109/jssc.2014.2311803

Cited by 48 publications

(10 citation statements)

References 33 publications

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“…where the four state variables correspond to voltages on the capacitors and the currents flowing through the inductors, scaled in such a way that the squared sum of the state variables is proportional to the stored energy, as done in [2], [45], where this approach was found to be accurate. In steady state and , where and are the total capacitance at the main LC tank and tail tank respectively.…”

Section: A -Only Class-b Oscillator With Tail Filtermentioning

confidence: 99%

Analysis and Design of a 195.6 dBc/Hz Peak FoM P-N Class-B Oscillator With Transformer-Based Tail Filtering

Garampazzi¹,

Mendes

Codega³

et al. 2015

IEEE J. Solid-State Circuits

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A complementary p-n class-B oscillator with two magnetically coupled second harmonic tail resonators is presented and compared to an N-only reference one. An in depth analysis of phase noise, based on direct derivation of the Impulse Sensitivity Function (ISF), provides design insights on the optimization of the tail resonators. In principle the complementary p-n oscillator has the same optimum Figure of Merit (FoM) of the N-only at half the voltage swing. At a supply voltage of 1.5 V, the maximum allowed oscillation amplitude of the N-only is constrained, by reliability considerations, to be smaller than the value that corresponds to the optimum FoM even when 1.8 V thick oxide transistors are used. For an oscillation amplitude that ensures reliable operation and the same tank, the p-n oscillator achieves a FoM 2 to 3 dB better than the N, only depending on the safety margin taken in the design. After frequency division by 2, the p-n oscillator has a measured phase noise that ranges from 150.8 to 151.5 dBc/Hz at 10 MHz offset from the carrier when the frequency of oscillation is varied from 7.35 to 8.4 GHz. With a power consumption of 6.3 mW, a peak FoM of 195.6 dBc/Hz is achieved.

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Section: A -Only Class-b Oscillator With Tail Filtermentioning

confidence: 99%

Analysis and Design of a 195.6 dBc/Hz Peak FoM P-N Class-B Oscillator With Transformer-Based Tail Filtering

Garampazzi¹,

Mendes

Codega³

et al. 2015

IEEE J. Solid-State Circuits

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“…As revealed by (9), the current's phase ϕ is sensitive to the maintaining amplifier's characteristics (g 1−3 ) and the harmonic amplitudes ( A 1−2 ), both of which can be influenced by the flicker noise-induced variations in the transistors. From this, it is apparent that to reduce the AM-PM conversion gain, the sensitivity of ϕ to g 1−3 and A 1−2 must be minimized.…”

Section: A Tl Dispersionmentioning

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.…”

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confidence: 99%

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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“…As one of the newest wave‐based oscillators, rotary traveling‐wave oscillator (RTWO) has gained recent interest due to some of its abilities: operating at high frequencies, sustaining a traveling wave with low phase noise, providing clock distribution with low skew and low jitter, and providing multiple‐phase signals . The property of providing multiple‐phase signals from different positions of the RTWO is useful for obtaining precise in‐phase and quadrature‐phase RF signals for I/Q modulation.…”

Section: Introductionmentioning

confidence: 99%

Thermal and flicker phase noise analysis in rotary traveling‐wave oscillator

Abbasalizadeh

Javadi

Naimi

2019

Circuit Theory & Apps

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Summary This paper analyzes the thermally induced phase noise and the up‐conversion of flicker noise into phase noise of rotary traveling‐wave oscillator (RTWO). Based on the analyses, this paper extracts the closed‐form formulas for the thermal and flicker phase noise of the RTWO. This paper compares the theoretical results with appropriate simulations to evaluate the accuracy of the derived closed‐form formulas. Comparisons confirm the accuracy of the extracted phase noise formulas. By using the presented straightforward approach along with accurate phase noise formulas, the designers can understand the RTWO's design tradeoffs. Also, they can design the RTWO for a specific phase noise without needing lengthy simulations.

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Analysis and Design of a 54 GHz Distributed “Hybrid” Wave Oscillator Array With Quadrature Outputs

Cited by 48 publications

References 33 publications

Analysis and Design of a 195.6 dBc/Hz Peak FoM P-N Class-B Oscillator With Transformer-Based Tail Filtering

Analysis and Design of a 195.6 dBc/Hz Peak FoM P-N Class-B Oscillator With Transformer-Based Tail Filtering

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

Thermal and flicker phase noise analysis in rotary traveling‐wave oscillator

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