Topic
Injection locking
About: Injection locking is a research topic. Over the lifetime, 4567 publications have been published within this topic receiving 60942 citations.
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TL;DR: In this paper, an integrated direct-injection locked quadrature voltage controlled oscillator (VCO) consisted of a 5 GHz VCO integrated with injection locked LC frequency dividers for low-power quadratures generation.
Abstract: This letter presents an integrated direct-injection locked quadrature voltage controlled oscillator (VCO), consisted of a 5-GHz VCO integrated with injection locked LC frequency dividers for low-power quadrature generation. The circuit is implemented using a standard 0.18-mum CMOS process. The differential VCO is a full PMOS Colpitts oscillator, and the frequency divider is performed by adding an injection nMOS between the differential outputs of complementary cross-coupled np-core LC VCO. The measurement results show that at the supply voltage of 1.8-V, the master 5-GHz VCO is tunable from 4.73 to 5.74GHz, and the slave 2.5-GHz VCO is tunable from 2.36 to 2.87GHz. The measured phase noise of master VCO is -118.2dBc/Hz while the locked quadrature output phase noise is -124.4dBc/Hz at 1-MHz offset frequency, which is 6.2dB lower than the master VCO. The core power consumptions are 7.8 and 8.7mW at master and slave VCOs, respectively
27 citations
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TL;DR: In this paper, the nonlinear dynamics of a semiconductor laser with optical injection from a frequency comb were analyzed and several dynamics, including injection locking with selective amplification of the comb line that shows the smallest detuning from the injected laser, and unlocked time-periodic dynamics that correspond to a new frequency comb with a broadened optical spectrum, thereby sharpening the pulse generated at the injection laser output.
Abstract: We analyze the nonlinear dynamics of a semiconductor laser with optical injection from a frequency comb. When varying both the injection parameters (detuning and injection ratio) and the comb properties (number of comb lines and comb spacing), we identify and select several dynamics, including (1) injection locking with selective amplification of the comb line that shows the smallest detuning from the injected laser, (2) unlocked time-periodic dynamics that correspond to a new frequency comb with a broadened optical spectrum, thereby sharpening the pulse generated at the injected laser output, and (3) unlocked chaotic dynamics.
27 citations
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TL;DR: In this article, a multiband phase-locked loop (PLL) is presented for the first time, which covers 40-, 60-, and 80 GHz bands. But the PLL is clocked by a reference frequency of 78 MHz and its output power is higher than -9.5 dBm.
Abstract: A millimeter-wave multiband phase-locked loop (PLL) is presented for the first time, which covers 40-, 60-, and 80-GHz bands. Three voltage-controlled oscillators corresponding to different frequencies are input to a multiband injection-locked frequency divider and switched on one at a time by a multiplexer as a band selector. The feedback loop embraces the following components: a chain of dividers with a fixed division-modulus of 256, a phase-frequency detector, a charge-pump, and a second-order loop filter. The PLL is clocked by a reference frequency of 78 MHz and its output power is higher than -9.5 dBm. The phase noise is -103 dBc/Hz at an offset frequency of 10 MHz. With a supply voltage of 1.5 V, the entire PLL consumes 114 mW. The chip is implemented in a 90-nm CMOS technology and measures 1.12 mm2.
27 citations
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TL;DR: It is found that the bifurcation diagram exhibits both bistable and unstable locked regions and the stable locked regime widens as the linewidth enhancement factor increases.
Abstract: A rate equation analysis on the modulation response of an optical injection-locked quantum cascade laser is outlined. It is found that the bifurcation diagram exhibits both bistable and unstable locked regions. In addition, the stable locked regime widens as the linewidth enhancement factor increases. It is also shown that both positive and negative optical detunings as well as strong injection strength enhance the 3 dB modulation bandwidth by as much as 30 GHz. Finally, the peak in the modulation response is significantly influenced by the optical frequency detuning.
27 citations
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TL;DR: Injection locking characteristics of oscillators are studied both qualitatively and analytically and the closed-form expressions of frequency-pulling and spectrum of the unlocked driven oscillator is estimated with negligible amplitude perturbation.
Abstract: Injection locking characteristics of oscillators are studied both qualitatively and analytically and the closed-form expressions of frequency-pulling and spectrum of the unlocked driven oscillator is estimated with negligible amplitude perturbation. Modifications in spectrum, lock range, and pulling of the oscillator are shown under significant amplitude perturbation. Also an approximate expression of amplitude perturbation is presented. Numerical simulations and experimental results describing the oscillator's pulling process under significant amplitude perturbation are given.
27 citations