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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.
This paper focuses on key phase noise measurement techniques for oscillators and reviews their advantages and disadvantages. Several test methods and test instruments are investigated. There's no “one size fits all” solution, for e.g., measuring a phase noise value of ‐130dBc/Hz at 1Hz offset from the carrier, and achieving a measurement noise floor better than ‐200dBm is challenge, using existing...
A novel evanescent-mode Möbius-coupled resonator oscillator is developed for the applications of synthesized X-band signal sources in RADAR and modern communication systems.
A novel Mobius-coupled printed resonator oscillators is developed in response to replacing expensive DRO (Dielectric Resonator Oscillator) for the application of synthesized signal sources in RADAR and modern microwave communication systems. One of the problems related to the Dielectric Resonator (DR) is miniaturization at lower microwave frequencies and also fabrication in integrated circuit (IC)...
In this paper, we show that two back to back coplanar waveguide (CPW) in the form of Mobius strip has resulted in an infinite transmission line capable of retaining a large bandwidth of frequencies that can be useful for real time signal retention device (RTRD). By providing Mobius twist to CPW, a continuous phase change reported instead of abrupt phase change by using shorting pins between two parallel...
Noise is associated with all the components of the oscillator circuit; however, the major contribution of the noise in an oscillator is from the active device, which introduces amplitude modulation (AM) and phase modulation (PM) noise [1]-[103]. The conventional wisdom is to ignore AM component of the noise because the gain limiting effects of the active device operating under saturation, allowing...
Accurate measurement of phase noise is one of the most difficult measurements in all of electrical engineering. The biggest challenge is the huge dynamic range required in most phase noise measurements. There are several methods to measure phase noise, and the right one must be chosen to make the necessary measurements. To make a proper selection from the various methods, it is necessary to know and...
A metamaterial based solution for parallel-plate noise reduction in power planes of digital and mixed-signal fast circuits is presented. The solution consists of embedding a periodic patterned surface between two dielectric layers and two metal planes. The novelty stems from the shape of the metal motif of the patterned surface of the unit cell. In each unit cell nine vias connect the metal patch...
RF signals in VCOs, PLLs and synthesizers are characterized by signal power, harmonic content and phase noise. These parameters have to be accurately measured in order to guarantee the system performance. This paper focuses on the relationship between the signal's harmonic content and the precision of the phase noise measurement in test equipment. The phase noise measurement's accuracy is degraded...
This paper reports a methodology of combining differential-phase-shift-injection-locking (DPSIL) with mode-coupled-delay-feedback (MCDF) techniques to shave the size, cost, and phase noise from Crystal oscillator circuits. An example of 100 MHz, 125 MHz and 155 MHz ovenized crystal oscillator (OCXO) is demonstrated for the validation of the novel approach, which holds good for both fundamental and...
A novel Slow-Wave Evanescent-Mode (SWEM) coupling technique is incorporated in voltage controlled oscillator circuits (VCOs) with the intent of lowering size, cost, power-consumption, phase noise, and vibration sensitivity for current and later generation communication systems. The trick is to dynamically restore the SWEM energy and suppress the random fluctuation of the tuned-resonator network for...
The reported oscillator circuits use active inductor topology for the cost-effective alternative of currently available varactor-tuned oscillator (VTO) circuits for the application in third and later generation communication systems. The state-of-the-art technology is analytically validated with the CAD simulated and measured data. It was observed that classical Leeson phase noise model unable to...
Injection mode-coupled voltage-controlled SAW oscillators (VCSOs) are versatile performers in low-noise frequency synthesizers, both as high-frequency sources and as reference oscillators. A novel high frequency digital synthesizer is reported with the intent of lowering following: size, cost, power-consumption, phase noise, jitter, and vibration sensitivity. The measured phase noise is typically...
A novel multi-band active inductor (AI) voltage controlled oscillator (VCO) is discussed and implemented using SiGe heterojunction bipolar transistors (HBTs). A design strategy centered on improving the locking range and broadband tunability of the transistorized tuned-inductor is being discussed and validated through an example of triple-band (0.9–1.8 GHz, 1.8–3.6 GHz, and 3.6–6.9 GHz) VCOs. Detailed...
This article reports a digital frequency synthesizer using adaptive mode-coupled resonator VCSO (voltage controlled SAW oscillator) circuit for low cost, low phase noise, and low jitter applications. The typical measured phase noise @ 10 kHz offset from the 1 GHz carrier is −152dBc/ Hz, with RMS jitter less than 6 femto-seconds.
Adaptive mode-coupled harmonically tuned voltage-controlled SAW oscillators (VCSOs) are versatile performers in phase-locked reference sources, can be supplied in standard and custom frequencies through 5 GHz at a fraction of the size and power consumption of multiplied references. The typical measured phase noise @ 10 kHz offset from the 5 GHz carrier is −140 dBc/ Hz with 500 kHz tuning and RMS jitter...
Demands for high-speed multimedia data communications increasing telescopically, pushing wireless transmission data rate with 2Gbps or higher. In these highspeed data communication systems, the bit error rate (BER) characteristic is dependent on a phase noise performance of the VCO. To meet the above challenges, it is necessary for these systems to have high performance VCO with low phase noise, low...
A novel adaptive slow-wave mode-coupling technique is incorporated in synthesizer with the intent of lowering size, cost, power-consumption, phase noise, and vibration sensitivity for current and later generation communication systems.
In this paper tunable active inductor (TAI) based oscillator topologies are presented. The reported TAI oscillator circuit uses dynamic phase-injection and feed-forward mechanism for improving the phase noise performance and dynamic ranges. The measured phase noise for carrier frequency 11.8 GHz is better than -110dBc/Hz at 1 MHz offset with 200 MHz tuning and DC bias of 3 V, 30 mA.
The high frequency (HF) crystal oscillator is susceptive to electromagnetic interference (EMI), which affects the stability or accuracy of reference frequency standards. The effect of radiated EMI can be both deterministic and random in nature that shows up as jitter in the time domain and phase noise in the frequency domain. In this paper, we studied the impact of radiated EMI in 155.6 MHz crystal...
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