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Optoelectronic oscillators with their demonstrated low phase noise are popular due to the increasing demand of very clean local oscillator and clock signal sources. Forced techniques are applied on an OEO system reducing the phase noise and suppresses side mode observed in standard OEO with long delays. A frequency synthesizer working at X-band is demonstrated using dispersive optical transversal...
A very clean and low phase noise microwave oscillator is required for communication and high resolution imaging. A frequency stabilized and tunable opto-electronic oscillator (OEO) is realized as synthesizer using a long fiber optic delay line combined with a tunable narrowband microwave filter. Forced oscillation using both self-injection locking and self-phase lock loop, as SILPLL provides an ultra-low...
A cost effective realization of optically Self-ILPLL of a state of the art phase locked DRO system at 10GHz in a 19″ rack mountable box is realized with phase noise of −132dBc/Hz at 10 kHz offset carrier. Long optical delay lines of 3km and 5km are respectively used for achieving self-dual phase locking (SPLL) and self-injection locking (SIL) at 10GHz. Phase noise of this DRO is reduced from −83.0dBc/Hz...
High stability oscillators are required for many RF applications. Phase noise reduction of voltage controlled oscillator (VCO) using different forced oscillation, such as self-injection locked, self-phase locked loop, and their combination as a self-Injection locked phase locked loop, has been reported, where optical delay lines are employed with low relative intensity noise (RIN) laser sources to...
This paper presents an automatic amplitude control (AAC) loop voltage controlled oscillator (VCO) with a constant VCO gain (Kvco) for fractional-N frequency synthesizers in WLAN application in 65nm CMOS process. A novel AAC scheme based on a mixed-signal feedback loop has been proposed to minimize the amplitude variation. In order to achieve a low Kvco variation, an extra switched varactor array is...
In this paper, a fully integrated 24GHz integer-N PLL for a 60GHz wireless transceiver is presented. A VCO with tail-feedback technique is used to improve the phase noise by modulating the tail current, and a switched varactor array is also adopted together with a switched capacitor array to compensate the variation of KVCO over different bands. Moreover, benefiting from the careful optimization of...
Phase noise performance of oscillators using various forced oscillation using self-injection locked phase locked loop (SILPLL) configurations has been reported. Comparisons are made to identify the key parameters that have the most impact on phase noise.
Self-injection locked and phase locked loop (SILPLL) using long optical delay has been proposed for phase noise reduction in microwave oscillators. Experiments for both single loop and dual loop SILPLL are performed to demonstrate the phase noise reduction in an electrical VCO. Dual loop configuration provided a phase noise reduction of 71 dB at 300 Hz offset while achieving a lower spurious signal...
A fully integrated phase-locked loop (PLL) frequency synthesizer for WLAN applications is designed in a 0.13-µm CMOS process. In order to make the loop bandwidth constant across the whole operating frequency range, a switched varactor array based LC-VCO is used to achieve a low KVCO variation, the charge pump current is programmed proportional to division ratio, and the variation on LPF resistance...
A dual-mode ultra-wideband VCO designed in a current-reused configuration is presented. By changing the coupling mode of the transformer tank, an ultra-wide frequency tuning range is achieved, while the current-reused topology is also incorporated to further lower the dc power consumption. Optimized in 90-nm CMOS technology, the proposed VCO attains a tuning range of 96.8% from 2.15 to 6.18 GHz, while...
Experimental result of phase noise reduction are presented for microwave oscillators. Both self-injection locking (IL) and self-phase locking (PLL) are combined to provide forced stable oscillation using self-ILPLL (SILPLL) for the first time. Analytical prediction for optimum performance of self-ILPLL is provided reaching unprecedented levels of −148dBc/Hz at 10kHz offset carrier for X-band oscillator.
Dual loop self-injection locking has been proposed for phase noise reduction and side-mode suppression in microwave oscillators. Experiments for both electrical and opto-electronic oscillator at 10 GHz that incorporate dual loop self-injection locking are performed to demonstrate the concept of self-injection locking (SIL) and provide insights into the behavior of microwave oscillators employing such...
A novel optoelectronic oscillator (OED) circuit using self-injection locked phase-locked loop (SILPLL) technique is reported for high frequency stable ultra-low phase noise signal source applications.
A wide tuning range 24GHz VCO (voltage-controlled oscillator) using IBM 90nm CMOS process is presented. Switched inductor and two bits capacitance array offer a widely tuning range. In addition, optimized switches are adopted to improve both tuning range and phase noise performance. Simulation shows that -101dBc/Hz phase noise is achieved at 1MHz offset. The tuning range of the VCO spans from 21.9GHz...
A low phase-noise 24GHz VCO (voltage-controlled oscillator) for mm-wave WLANs (wireless LANs) using IBM 90nm CMOS process is presented. A current source is used to minimize the impact due to the process variation. Biasing filter technique is adopted to improve the phase noise performance. In addition, optimized switches are proposed to prevent phase noise degradation. Simulation shows that -101dBc/Hz...
A 2 GHz differentially tuned CMOS monolithic LC-VCO was designed and fabricated in 0.18-mum CMOS process. The VCO has a 16.15% tuning range (from 1.8998 GHz to 2.2335 GHz) due to a combination of analog and digital tuning technique (4-bit binary switch-capacitor array). The measured phase noise is -118.17 dBc/Hz at 1 MHz offset from 2.158 GHz carrier. With the presented smart switch, the phase noise...
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