Stability and Phase-Noise Analysis of Pulsed Injection-Locked Oscillators

Blanco-Fernández, Elena; Ramírez, Franco; Suárez, Almudena; Sancho, Sergio

doi:10.1109/tmtt.2012.2228670

Cited by 6 publications

(7 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When varying a suitably chosen tuning parameter η, the oscillator should be able to lock to each of the different input frequencies ω k . To get analytical insight, the oscillator will be described at its fundamental frequency, in terms of its current-to-voltage ratio Y(V,ω,η) at a particular observation node [22][23][24][25][26], where V and ω are the excitation amplitude and frequency. This admittance function will be the current-to-voltage ration of an AG connected at the observation node in the HB simulation of the oscillator circuit.…”

Section: Analytical Formulationmentioning

confidence: 99%

Analysis of high-order sub-harmonically injection-locked oscillators

Hernandez

Pontón

Sancho

et al. 2020

Int. J. Microw. Wireless Technol.

Self Cite

View full text Add to dashboard Cite

High-order sub-harmonically injection-locked oscillators have recently been proposed for low phase-noise frequency generation, with carrier-selection capabilities. Though excellent experimental behavior has been demonstrated, the analysis/simulation of these circuits is demanding, due to the high ratio between the oscillation frequency and the frequency of the input source. This work provides an analysis methodology that covers the main aspects of the circuit behavior, including the detection of the locking bands and the prediction of the phase-noise spectral density. Initially, the oscillator in the presence of a multi-harmonic input source is described with a reduced-order envelope-domain formulation, at the oscillation frequency, based on an oscillator-admittance function extracted from harmonic-balance simulations. This allows deriving an expression for the oscillation phase shift with respect to the input source, and the average of this phase shift is shown to evolve continuously in the distinct synchronization bands obtained when varying a tuning voltage. This property can be used to detect the locking bands in circuit-level envelope-domain simulations, which, as shown here, can be done through different Fourier decompositions and sampling rates. The phase noise of the high-order sub-harmonic injection-locked oscillator under an arbitrary periodic input waveform is investigated in detail. The frequency response to the noise sources is described with a semi-analytical formulation, relying on the oscillator-admittance function in injection-locked conditions. The input noise is derived from the timing jitter of the injection source and the phase-noise response is shown to exhibit a low-pass characteristic, which initially follows the up-converted input noise and then the oscillator own noise sources. A method is proposed to identify the key parameters of the derived phase-noise spectrum from envelope-domain simulations. The various analysis methodologies have been applied to a prototype at 2.7 GHz at the sub-harmonic order N = 30 which has been manufactured and measured.

show abstract

Section: Analytical Formulationmentioning

confidence: 99%

Analysis of high-order sub-harmonically injection-locked oscillators

Hernandez

Pontón

Sancho

et al. 2020

Int. J. Microw. Wireless Technol.

Self Cite

View full text Add to dashboard Cite

show abstract

“…1). The objective is to reduce the phase noise of the higher frequency oscillator [22][23], operating at 5.7 GHz, through the synchronization to a pulsed signal of a much lower frequency, in the order of 100 MHz (Fig. 2).…”

Section: T E T I V T T T H T T V T T G Tmentioning

confidence: 99%

“…. Time domain integration can be combined with a Poincaré map technique [13,23] to analyze the qualitative variations of the steady-state solution versus the pulse frequency f p . At each f p , the solution is examined in a time interval (T start , T end ), such that the circuit behaves in steady-state regime in this interval.…”

Section: T E T I V T T T H T T V T T G Tmentioning

confidence: 99%

“…This method can be combined with the use of auxiliary generators (AGs) to simulate the possible circuit self-oscillation and predict qualitative changes in the solution under the continuous variation of a parameter [18][19]. This contribution presents several examples of timely circuits which are demanding from a simulation point of view, including pulse injection-locked oscillators [22][23], rotary travelling wave oscillators (RTWO) [24][25] and unstable power amplifiers.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Nonlinear microwave simulation techniques

Suárez

2015

2015 Integrated Nonlinear Microwave and Millimetre-Wave Circuits Workshop (INMMiC)

Self Cite

View full text Add to dashboard Cite

-The design of high performance circuits with short manufacturing cycles and low cost demands reliable analysis tools, capable to accurately predict the circuit behaviour prior to manufacturing. In the case of nonlinear circuits, the user must be aware of the possible coexistence of different steady-state solutions for the same element values and the fact that steadystate methods, such as harmonic balance, may converge to unstable solutions that will not be observed experimentally. In this contribution, the main numerical iterative methods for nonlinear analysis, including time-domain integrations, shooting, harmonic balance and envelope transient, are briefly presented and compared. The steady-state methods must be complemented with a stability steady-state analysis to verify the physical existence of the solution. This stability analysis can also be combined with the use of auxiliary generators to simulate the circuit self-oscillation and predict qualitative changes in the solution under the continuous variation of a parameter. The methods will be applied to timely circuit examples that are demanding from the nonlinear analysis point of view.

show abstract

“…Due to the difficulties in the analysis of the high-order subharmonic injection-locked regime, approximate oscillator models are used in [5]- [6], [12]- [14], whereas the simulations in [7], [15] rely on the Poincaré-map technique [16]- [18]. This map is applied to the sequence of steady-state solutions obtained through time-domain integration of the differential algebraic equation system when varying a particular analysis parameter, such as the input power or frequency.…”

Section: Introductionmentioning

confidence: 99%