Journal ArticleDOI
Analysis and Design of a CMOS Phase-Tunable Injection-Coupled LC Quadrature VCO (PTIC-QVCO)
I.R. Chamas,Sanjay Raman +1 more
TLDR
This paper presents the design, analysis, and characterization of a low-power, low-phase-noise, phase-tunable injection-coupled LC quadrature oscillator (PTIC-QVCO), a superharmonically coupled VCO that is driven to its optimum phase noise performance via a frequency doubler.Abstract:
This paper presents the design, analysis, and characterization of a low-power, low-phase-noise, phase-tunable injection-coupled LC quadrature oscillator (PTIC-QVCO). Two LC VCOs are superharmonically coupled in quadrature phase via a frequency doubler that injects a synchronizing signal at the common source node of the negative transconductor stage. Conceptual and analytical models of the circuit are introduced to derive the conditions for quadrature operation and examine the circuit parameters affecting the phase imbalance due to mismatched VCOs. Additionally, a tunable tail filter (TTF) is incorporated to calibrate the residual quadrature imbalance in presence of a 3-sigma variation in the device parameters and drive the oscillator to its optimum phase noise performance. To validate the proposed approach, measurements have been carried out on a 9 GHz prototype implemented in a 0.18 mum RF CMOS process. With core current consumption of 5 mA at 1.8 V supply voltage, the circuit achieves a measured phase noise figure-of-merit ranging from 177.3 to 182.6 dBc/Hz at 3 MHz offset along the 9.0 to 9.6 GHz frequency tuning range. Quadrature phase correction of plusmn110 at 9 GHz is demonstrated.read more
Citations
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Journal ArticleDOI
A Low-Phase-Noise Multi-Phase Oscillator Based on Left-Handed LC-Ring
Guansheng Li,Ehsan Afshari +1 more
TL;DR: A distributed multi-phase oscillator based on left-handed LC-ring that can synthesize multiple phases while maintaining the same phase-noise figure-of-merit (FoM) as a single-stage LC oscillator by avoiding coupling MOSFETs which deteriorate phase noise significantly.
Journal ArticleDOI
A Multi-Phase Sub-Harmonic Injection Locking Technique for Bandwidth Extension in Silicon-Based THz Signal Generation
TL;DR: A scalable and cascadable “active frequency multiplier” chain architecture is proposed, which achieves THz signal generation from a low mm-wave frequency tone and proposes a multi-ring topology to facilitate the design and the high-frequency routing.
Journal ArticleDOI
A CMOS Quadrature VCO With Subharmonic and Injection-Locked Techniques
TL;DR: A 1-V quadrature voltage-controlled oscillator using subharmonic and injection-locked techniques (SHIL-QVCO) is presented, which has the advantages of low phase noise and low power consumption.
Journal ArticleDOI
A Phase and Amplitude Tunable Quadrature $LC$ Oscillator: Analysis and Design
TL;DR: A new analytical approach to extract closed form equations for phase and amplitude imbalances raised from mismatches between two LC-tanks in quadrature oscillators is presented, showing that using differential stages for tuning tail currents of oscillating stages can somehow implement the inversely proportional coupling factors.
Proceedings ArticleDOI
A multi-phase sub-harmonic injection locking technique for bandwidth extension in silicon-based THz signal generation
TL;DR: A scalable “active frequency multiplier” chain architecture is proposed, which can generate THz signal from a low mm-wave frequency or RF reference source and also proposes a multi-ring system topology to implement this frequency multiplier scheme.
References
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Book
Operation and modeling of the MOS transistor
TL;DR: In this article, the MOS transistors with ION-IMPLANTED CHANNELS were used for CIRCUIT SIMULATION in a two-and three-tier MOS structure.
Journal ArticleDOI
Matching properties of MOS transistors
TL;DR: In this paper, the matching properties of the threshold voltage, substrate factor, and current factor of MOS transistors have been analyzed and measured, and the matching results have been verified by measurements and calculations on several basic circuits.
Journal ArticleDOI
A general theory of phase noise in electrical oscillators
Ali Hajimiri,Thomas H. Lee +1 more
TL;DR: In this paper, a general model is introduced which is capable of making accurate, quantitative predictions about the phase noise of different types of electrical oscillators by acknowledging the true periodically time-varying nature of all oscillators.
Journal ArticleDOI
Matching properties of MOS transistors
TL;DR: In this article, the matching properties of the threshold voltage, substrate factor and current factor of MOS transistors have been analyzed and measured, and the matching results have been verified by measurements and calculations on a band-gap reference circuit.