Frequency Domain Phase Shift Measurement Technique Applied to a Multiphase Rotary Travelling-Wave VCO

Ansari, Kimia T.; Ross, Tyler; Gamand, P.; Plett, C.

doi:10.1109/lmwc.2015.2495150

Cited by 4 publications

(4 citation statements)

References 7 publications

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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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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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“…However, this work does not talk about the adjustment of phase and clock skews. A Ku-Band High Output Power Multiphase Rotary Traveling-Wave VCO in SiGe BiCMOS is discussed in [59], which explores a multiphase 18 GHz RTWO with eight different phases. However, this work did not talk about the phase error detection and calibration.…”

Section: Fig 25a Conventional Global Clock Distributionmentioning

confidence: 99%

“…By increasing the phase tuning capacitances from stages v1 to v4 and decreasing the capacitances from stages v5 to v8 by the same amounts, results in a decreased traveling wave propagation delay and an increased phase shift from stage v1 to stage v4. As a corollary, the travelling wave signal speeds up across stage v5 to stage v8 and thus decreasing that phase shift [59], [61].…”

Section: Rtwo Phase Tuningmentioning

confidence: 99%

“…The direction of the RTWO output phase is known by varying the CVP's capacitance. As the capacitance before a given taping point in the ring is increased, the output signal is delayed and phase increased [59], [61]. To maintain the same free running frequency the total CVP capacitance is held constant but phase at different points is varied by adjusting the CVPs.…”

Section: Fig 624 the Calibration Flow Chart Of The Bistmentioning

confidence: 99%

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A Novel Clock Distribution System with Injection Locked Rotary Traveling Wave Oscillator and Built-In Self-Test

Bai¹

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The thesis implemented a clock distribution system with novel Injection Locked Rotary Traveling Wave Oscillators (IL-RTWOs) and Built-In Self-Test (BIST). Both trans-conductance injection locking and pulse injection locking techniques are explored.The combination of switched Metal-Insulator-Metal capacitors (MIM-caps) and a novel use of Complementary Varactor Pairs (CVPs) target a 1.7 GHz to 2.0 GHz frequency tuning range and 100 kHz frequency resolution. The Complementary Varactor Pairs (CVPs) implemented for RTWO phase tuning achieves 56° phase tuning range and 0.34° worst case phase tuning resolution. The RTWO scheme is implemented in IBM's 130 nm CMOS technology. The RTWO free running phase noise is -126dBc/Hz at 1MHz offset from 2 GHz operating frequency. With the injection locking techniques, the RTWO inband phase noise is further reduced. This project also describes a Built-In Self-Test (BIST) circuit used to verify and tune the timing integrity of the clock distribution system. The die area is limited by the outer parameter of the RTWOs -leaving internal space for other circuits. The BIST circuit occupies 0.025 mm 2 chip area. The BIST circuit allows testing of the integrity of the clock distribution system at speed by determining if the system clock skew can be tolerated or needs adjustment. The clock distribution network consumes a total of 26.5 mA current from a 1.14 V power supply.The close-in spurs of the IL-RTWO are 79 dB lower than the output spectrum. The IL-RTWO attains an inband phase noise performance of -132 dBc/Hz at 100 kHz offset from 2.039 GHz output and its integrated rms jitter from 1 kHz to 40 MHz offset frequency is 39 fs. The pulse and transconductance injector circuits are analyzed and measured and it RTWORotary Traveling Wave Oscillator

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