Injection locking

About: Injection locking is a research topic. Over the lifetime, 4567 publications have been published within this topic receiving 60942 citations.

An mm-Wave Synthesizer With Robust Locking Reference-Sampling PLL and Wide-Range Injection-Locked VCO

Abstract: In this article, a two-stage millimeter (mm)-wave frequency synthesizer with low in-band noise and robust locking reference-sampling techniques is presented. Using a two-stage scheme allows separately dealing with the low phase noise (PN) frequency synthesis in the first stage and the mm-wave frequency multiplication in the second stage, achieving the best overall power efficiency. In the first stage, a voltage domain reference-sampling phase detector (RSPD)-locked loop (RSPLL) is adopted to achieve both low PN and robust locking without additional frequency locking loop. A reference reshaping buffer is implemented to improve the phase detector gain and in-band PN. The reference rising/falling time is programmable to achieve optimal RSPLL performance even under external disturbances. The second stage employs an injection-locked voltage-controlled oscillator (ILVCO) for 4 $\times $ frequency multiplication. A low-power digital frequency tracking loop (FTL) detecting actual frequency errors is implemented in order to achieve wide operation range for the ILVCO while using a high ${Q}$ tank with low power. The prototype synthesizer was fabricated in a 45-nm partially depleted silicon on insulator (PDSOI) CMOS technology. The first stage 9-GHz RSPLL achieves 144-fs integrated jitter with 7.2-mW power consumption, achieving a figure of merit (FoM) of −248 dB and the overall mm-wave synthesizer achieves 251-fs integrated jitter with 20.6-mW power consumption at 35.84 GHz, achieving an FoM of −238.9 dB.

Frequency modulation on single sideband using controlled dynamics of an optically injected semiconductor laser

Abstract: Nonlinear dynamics of an optically injected semiconductor laser is applied to photonic microwave generation By properly adjusting the injection conditions, the optical frequency of the slave laser is first locked to the master laser The slave laser is then driven into a periodic dynamical state, resulting in a single-sideband (SSB) microwave modulation on the optical carrier The frequency of the SSB can be controlled by the optical injection strength and detuning Frequency-modulated SSB can, thus, be obtained from a modulated injection In this work, we experimentally investigate the generated SSB in terms of its broad tunability and fast modulation response The results suggest application of this system in radio-over-fiber and optical subcarrier multiplexing technologies when microwave frequency modulation or frequency-shift keying is employed

Dual-wavelength injection-locked pulsed laser.

Abstract: An injection-locked pulsed Ti:sapphire laser oscillating at dual wavelengths is demonstrated for the first time to our knowledge. By use of two feedback loops, seeds of two independent master lasers are locked on specific longitudinal modes of a power oscillator, leading to a stable dual-wavelength oscillation over a long time scale. The two injection-locked pulsed outputs completely overlap in time, with spectral purities reaching a Fourier-transform limit. The dual-wavelength oscillation is controlled by the master lasers only, allowing for flexible selectivity of the two wavelengths and full controllability of the relative two-wavelength pulsed energies.

An all-digital clock generator using a fractionally injection-locked oscillator in 65nm CMOS

Abstract: Injection locking is an effective method to reduce the jitter of clock generators especially for a ring oscillator-based PLL that has poor phase noise [1–3]. While the use of injection locking reduces the output jitter, one disadvantage is that the output frequency can be changed only by integer multiples of the reference frequency, if it can be changed at all. In this work, an ADPLL-based clock generator is presented that employs a fractional-injection-locking method that exploits the multiphase output of a ring oscillator. The clock generator achieves an average of 4.23ps rms jitter and a frequency resolution of 1MHz while using a reference clock of 32MHz.