Thinner and Faster Photodetectors Producing Lower Phase Noise

Several state-of-the-art wireless receiver architectures are presented including the traditional super-heterodyne, the image-reject heterodyne, the direct-conversion, and the very-low intermediate frequency (VLIF). The case studies are followed by a detailed view of receiver building blocks: low-noise amplifiers (LNA), mixers, and voltage-controlled oscillators (VCO). Two popular topologies currently exist for LNAs: the common-gate configuration, which offers low power consumption with superior stability, robustness and linearity performance, and its common-source counterpart, which provides comparatively higher gain and lower noise figure. Aside from the traditional passive and active Gilbert mixers, the even-harmonic and masking-quadrature mixers are developed to combat second-order non-linearity and improve image-rejection, respectively. For quadrature carrier generation, the degeneration-injected QVCO is superior to the cascode-injected QVCO both in terms of phase noise and tuning range. The Colpitts QVCO is attractive as a low-noise alternative as it does not disturb the output voltage as much as its traditional LC counterpart and thus offers lower phase noise.

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A Wideband Gain Linearized Microwave Voltage Controlled Oscillator with Low Phase Noise Variation in Nanometer CMOS Technology

Journal of Circuits System and Computers ◽

10.1142/s0218126615500243 ◽

2015 ◽

Vol 24 (03) ◽

pp. 1550024 ◽

Cited By ~ 3

Author(s):

Mohammed Aqeeli ◽

Abdullah Alburaikan ◽

Cahyo Muvianto ◽

Xianjun Huang ◽

Zhirun Hu

Keyword(s):

Phase Noise ◽

Frequency Tuning ◽

Supply Voltage ◽

Cmos Technology ◽

Voltage Controlled Oscillator ◽

Lower Phase ◽

Nanometer Cmos ◽

Digitally Controlled ◽

Binary Weighted ◽

Low Phase Noise

A wideband CMOS LC tank voltage-controlled oscillator (VCO) with low phase noise variations and a linearized gain has been designed using a new binary-weighted switched-capacitor and digitally-controlled varactor bank. The novel design has the advantages of more linear VCO frequency tuning, lower phase noise and reduced gain to variations in supply voltage. The proposed VCO has been designed using UMC 90-nm, 6-metal CMOS technology and features phase noise variation of less than 4.9 dBc/Hz. The VCO operates from 3.45 to 6.55 GHz, with phase noise of -133.4 dBc/Hz at a 1 MHz offset, a figure of merit (FoM) of -203.3 dBc/Hz, less than 41 dBm spurious harmonics, and a total VCO core current consumption of 1.18 mA from a 3.3 V voltage supply. To the authors' knowledge, this is the lowest phase noise variation ever reported.

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Low Phase Noise Feedback Oscillators Utilizing High-Q SIW Filter with Dielectric Loading

Frequenz ◽

10.1515/freq-2018-0070 ◽

2019 ◽

Vol 73 (1-2) ◽

pp. 1-6

Author(s):

Hao Zhang ◽

Wei Kang ◽

Wen Wu

Keyword(s):

Phase Noise ◽

Feedback Loop ◽

Peak Frequency ◽

Harmonic Suppression ◽

Noise Performance ◽

Lower Phase ◽

High Q ◽

Dielectric Loading ◽

Phase Noise Performance ◽

Low Phase Noise

Abstract High-Q substrate integrated waveguide (SIW) resonator and its application to low phase noise oscillators are focused in this paper. By drilling air holes in the substrate, SIW bandpass filters (BPFs) with high Q factor could be achieved. This SIW filter is embedded into the feedback loop to be treated as a frequency stabilization element in designing the oscillator. The complex quality factor (Qsc)-peak frequency of the filter is chosen as the final oscillation frequency to obtain low phase noise performance. Moreover, air boxes are utilized instead of the air holes in the substrate to design another oscillator with lower phase noise performance and good harmonic suppression. Two low phase noise oscillators based on fourth-order SIW BPFs with dielectric loading have been studied, demonstrated and fabricated to verify the design concept.

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Impact of Fiber Nonlinearity on the Performance of Mode Division Multiplexing Systems

Iraqi Journal of Computer Communication Control and System Engineering ◽

10.33103/uot.ijccce.19.2.5 ◽

2019 ◽

pp. 41-49

Keyword(s):

Phase Noise ◽

Analytical Model ◽

Error Vector Magnitude ◽

Lower Phase ◽

Channel Power ◽

Fiber Nonlinearity ◽

Nonlinear Phase ◽

Transmission Distance ◽

Mode Division Multiplexing ◽

Symbol Rate

In this paper, an analytical model is developed to estimate a nonlinear phase noise (NPN) due to Kerr fiber nonlinearity and its interaction with amplifier noise in mode division multiplexing (MDM) systems. Our analysis uses generalized coupled multimode nonlinear Schrödinger equations (MM- NLSE) that describe the propagation of the mode superimposing in the optical fiber. The nonlinear phase noise versus channel power and transmission distance is evaluated by implementing our analytical model for LP01, LP11a, and LP11b spatial modes. Each mode carries a 4-QAM signal at a symbol rate of 20 Gsymbol/s. The results reveal that LP11 mode has a lower phase noise variance than LP01 mode over entire transmission distances. Finally, the error vector magnitude (EVM) versus channel power is quantified using an analytical model.

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Filtering technique to lower phase noise for 2.4GHz CMOS VCO

2008 9th International Conference on Solid-State and Integrated-Circuit Technology ◽

10.1109/icsict.2008.4734867 ◽

2008 ◽

Author(s):

Wenhao Yan ◽

Chan Hyeong Park

Keyword(s):

Phase Noise ◽

Lower Phase ◽

Filtering Technique

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A current shaping technique to lower phase noise in LC oscillators

2008 15th IEEE International Conference on Electronics, Circuits and Systems ◽

10.1109/icecs.2008.4674873 ◽

2008 ◽

Cited By ~ 4

Author(s):

Jian Chen ◽

Fredrik Jonsson ◽

Hakan Olsson ◽

Li-Rong Zheng ◽

Dian Zhou

Keyword(s):

Phase Noise ◽

Lower Phase ◽

Shaping Technique ◽

Lc Oscillators ◽

A Current

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A New Technique for the Design of Multi-Phase Voltage Controlled Oscillators

Journal of Circuits System and Computers ◽

10.1142/s0218126617501134 ◽

2017 ◽

Vol 26 (07) ◽

pp. 1750113 ◽

Cited By ~ 4

Author(s):

Jingru Sun ◽

Pan Huang ◽

Yichuang Sun

Keyword(s):

Power Consumption ◽

Phase Noise ◽

Total Power ◽

Control Voltage ◽

Integer Number ◽

Cmos Process ◽

Phase Voltage ◽

Lower Phase ◽

Total Power Consumption ◽

Multi Phase

In this work, a novel circuit structure for second-harmonic multi-phase voltage controlled oscillator (MVCO) is presented. The proposed MVCO is composed of [Formula: see text] ([Formula: see text] being an integer number and [Formula: see text]2) identical inductor–capacitor ([Formula: see text]) tank VCOs. In theory, this MVCO can provide 2[Formula: see text] different phase sinusoidal signals. A six-phase VCO based on the proposed structure is designed in a TSMC 0.18[Formula: see text]um CMOS process. Simulation results show that at the supply voltage of 0.8[Formula: see text]V, the total power consumption of the six-phase VCO circuit is about 1[Formula: see text]mW, the oscillation frequency is tunable from 2.3[Formula: see text]GHz to 2.5[Formula: see text]GHz when the control voltage varies from 0[Formula: see text]V to 0.8[Formula: see text]V, and the phase noise is lower than [Formula: see text]128[Formula: see text]dBc/Hz at 1[Formula: see text]MHz offset frequency. The proposed MVCO has lower phase noise, lower power consumption and more outputs than other related works in the literature.

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