Device mismatch seriously degrades accuracy in noise figure characterization. The suitability of corrections to the gain definitions for a more precise noise figure evaluation for mismatched devices is investigated and compared to classical techniques. The effects of device mismatch on the noise figure of the noise-meter receiver and its impact on the final accuracy are analyzed.

The nonzero response time of the Kerr [chi(3)] nonlinearity determines the quantum-limited noise figure of chi(3) parametric amplifiers. This nonzero response time of the nonlinearity requires coupling of the parametric amplification process to a molecular-vibration phonon bath, causing the addition of excess noise through Raman gain or loss at temperatures above 0 K. The effect of this excess ...

Fibre Raman amplifiers are being deployed in many new long-haul and ultra long-haul fibre-optic transmission systems, making them the first and most widely commercialized nonlinear optical devices in telecommunications. One of the main reasons for this is their improved noise figure and reduced nonlinear penalty of fibre systems hence allowing for longer amplifier spans. In this paper, we have ...

The low noise amplifier (LNA) serves as the first component of the radio frequency receiver system. The performance of LNA determines the sensitivity and selectivity of the receiver. In order to maximize performance the gain, noise figure and input matching of LNA needs to be optmized. This paper presents a 60GHz low noise amplifier on 0.13-μm standard CMOS technology designed using classical n...

Introduction In order to maximize the signal-to-noise-ratio (SNR) performance of an MR receiver coil the preamplifier used should add as little noise as possible. The amount of added noise is characterized by its noise figure (NF). Standard NF measurement of a preamplifier requires a tuner to present reference noise at varying complex impedance to the input of the device. Such tuners are not co...

LNA, the author stated that there were other sources of noise outside of the amplifier that added to the noise figure, such as board parasitics as well as noisy bias components. The author further stated that the prediction of the model presented here is similar to the noise figures presented in similar CMOS LNA's.[4] IV. Conclusion A complete model for the drain current noise for MOSFET device...

The sensitivity of communications systems is limited by noise. Noise figure for low noise amplifier (LNA) design is highly relevant for LNA’s prima-facie function for adding as low as noise to be added to the desired signal amplification when simulated for system level configuration for varied frequencies ranges. In this paper the noise figure was analyzed as performance parameter for C-band fo...

There is a growing trend to integrate noise figure measurement capabilities in microwave instruments originally devoted to other general purpose measurements as Vector Network Analyzers or Spectrum Analyzers. This opens up new possibilities to take into account vector corrections (at least in the case of VNA), or even to consider other techniques (such as cold-source) for computing the noise fi...

Introduction High-field arrays with large numbers of coils require preamplifiers located close to the coils to minimize SNR losses incurred in cables. The design of low-noise preamplifiers for high-field MRI must thus ensure there is no performance degradation due to the presence or orientation of high magnetic fields. Preamplifier scattering (S) parameters have been known to vary with B0 field...

Introduction Noise figure (NF) and the third-order intercept point (IP3) are used in radio receiver link budget analysis as a means to quantify the effects of device noise and nonlinearity on the sensitivity of the radio. Analog-to-digital converters (ADCs) are used in radio receivers to convert the signal from the analog domain to the digital domain. NF and IP3 typically are not specified for ...