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Noise Figure Measurement Method Using Narrowband Compensation

A noise figure, noise technology, applied in the field of noise figure measurement using narrowband compensation, can solve problems such as distortion

Active Publication Date: 2019-11-29
KEYSIGHT TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, many other devices contain integrating bandpass filters that produce large changes in gain and NF in the transition region between the filter's in-band and out-of-band responses, and the cold source method can introduce a pass Y factor into the noise figure measurement distortion that does not occur
If the bandwidth of the DUT is not significantly greater than the bandwidth of the receiver used to measure the output noise, the distortion may be significant

Method used

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  • Noise Figure Measurement Method Using Narrowband Compensation
  • Noise Figure Measurement Method Using Narrowband Compensation
  • Noise Figure Measurement Method Using Narrowband Compensation

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[0026] In the following detailed description, for purposes of explanation and not limitation, representative examples disclosing specific details are set forth in order to provide a thorough understanding of the present teachings. However, it will be apparent to one of ordinary skill having the benefit of this disclosure that other embodiments in accordance with the present teachings that depart from the specific details disclosed herein remain within the scope of the appended claims. Moreover, descriptions of well-known apparatuses and methods may be omitted so as not to obscure the description of the example embodiments. Such methods and apparatus are clearly within the scope of the present teachings.

[0027] The terminology used herein is for the purpose of describing individual embodiments only and is not intended to be limiting. Except for the technical and scientific meanings of the defined terms, the defined terms are as commonly understood and accepted in the technic...

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Abstract

A method of determining a noise figure (NF) response of a device under test (DUT) comprises determining a frequency response of a noise receiver over a first frequency range, measuring a gain of the DUT over a second frequency range encompassing the first frequency range, measuring output-noise power of the DUT over the second frequency range, determining an estimated gain of the DUT based on the frequency response of the noise receiver and the gain of the DUT over the first frequency range, and determining the NF response of the DUT over the second frequency range based on the estimated gain and the output-noise power.

Description

Background technique [0001] Noise figure (NF) is a widely used measure to describe the signal-to-noise ratio (SNR) degradation that occurs in signals passing through an electrical network. The noise factor (F) of the network is generally defined as the input SNR divided by the output SNR: F=(S i / N i ) / (S 0 / N 0 ), where, S i = Input signal power, S 0 = output signal power, N i = Input noise power, N 0 = output noise power. NF is the noise factor expressed in decibels: NF=10*log(F). [0002] For electronic assemblies that are not passive, a significant source of degradation is noise generated from internal active devices such as transistors. Thus, NF measurements are generally an essential part of device characterization in research and development and process validation in manufacturing. [0003] Two techniques are commonly used to measure NF: the Y-factor method and the cold source method. The Y-factor method (also known as the hot / cold source method) is the mains...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00G01R29/26
CPCG01R23/20G01R27/28G01R29/26
Inventor D·J·巴洛J·B·克尔R·E·舒尔德斯
Owner KEYSIGHT TECH