噪声系数/噪声参数测量

介绍

噪声在任何主动设备或电路中自然发生,并限制有用信号的最小水平。例如,通过手机,它可以干扰弱信号,并中断呼叫。因此,重要的是设计电路以最小化噪声的影响。为此,必须以噪声参数的形式量化和测量噪声,包括FMIN,伽马,选择(MAG和相位)和RN。

阻抗调谐器通常与噪声系数分析仪(或备用噪声测量仪器)结合使用,以测量噪声系数或噪声功率,因为​​源阻抗呈现给DUT的源阻抗,从中提取噪声参数。

Note, the term Noise Figure is a commonly referenced parameter when discussing LNAs, and most often refers to the 50ohm noise contribution of a device. The 50ohm Noise Figure of a device can be directly measured using the Noise Parameter system, or extrapolated from the Noise Figure contours. Direct measurement is achieved by using an impedance tuner to present exactly 50ohm to the DUT and measuring the associated noise figure (note, the tuner can correct for the non-50ohm system impedance normally presented without a tuner). Noise Figure extrapolation is a standard function within a noise parameter measurement system and uses mathematically determined contours to calculate the expected Noise Figure contribution at 50ohm.


噪声系数/噪声参数测量

Ultra-Fast Noise Parameters

A new ultra-fast noise parameter measurement method is able to improve overall calibration and measurement time by a factor of 100X-400X, bringing measurements that could once take tens or hundreds of hours to tens of minutes. The new method has two key features that contribute to the breakthrough speed improvement: 1) The tuner is characterized with one set of states (physical tuner positions) that are selected to give a reasonable impedance spread over the frequency band of interest; and 2) the noise power measurement is swept over the frequency range at each state, so that the tuner only moves to each position once. This takes advantage of the fast sweep capability of modern instruments, as well as saving time by minimizing tuner movement.

新的噪声参数测量方法提供了两个数量级速度改善。它还产生更平滑的数据,并且散射少于传统方法。快速测量速度消除了温度漂移,并使用内部噪声接收器的VNA简化了设置,使其更加稳定且一致。速度更高的速度使得始终完全校准校准,以最小化错误,并测量更多频率以获得更好的散射和周期误差的频率,并能够更自信地使用平滑。较高的频率密度也通过减少由于锯齿引起的换档来提高精度。


纽摩

Ultra-Fast Noise Parameters

Measurement Hardware

The Keysight N524x-series PNA-X is the only instrument of its kind to include an embedded electronic tuner capable of presenting impedances up to Γ=0.3 (VSWR~2:1). When measuring a near-50Ω transistor, the electronic tuner may be sufficient in presenting impedances to solve the unknown equations and determine noise parameters. For non-50Ω transistors, the embedded electronic tuner is bypassed and an external automated impedance tuner is used to present impedances closer to Γopt. Tuner model MT982BL01 is recommended for measurements between 0.8-18 GHz; tuner model MT983BL01 for measurements between 2-26 GHz; tuner model MT984AL01 for measurements between 8-50 GHz.

The PNA-X is also the only instrument to combine a vector receiver with a dedicated and optimized noise receiver. The sensitivity of the noise receiver is critical in determining the noise figure F by accurately measuring the noise power contribution of the transistor. The accuracy of the noise measurement is directly related to the second-stage noise figure of the noise receiver, the lower the better. While it is possible to directly use the noise receiver of the PNA-X, the second-stage noise figure can be reduced by5-6 dBwith the addition of an external noise receiver module (NRM) MT7553B03.


Keysight N524X系列PNA-X

MT7553 Noise Receiver Modules

有关更多信息Noise Receiver Modules (NRM) and Noise Switch Modules (NSM) can be found here.

了解有关我们如何帮助您实现目标的更多信息


[ 关闭 ]

Need information regarding Noise Figure / Noise Parameter Measurements?

填写下面的表格,专家将与您联系。







*表示“必填”的字段。

应用笔记和数据表

5A-042

A New Noise Parameter Measurement Method Results in More than 100x Speed Improvement and Enhanced Measurement Accuracy 5A-042

5C-085.

使用阻抗调谐器和噪声接收器模块将Agilent PNA-X扩展到50 GHz噪声参数 5C-085.

5C-088

50 GHz Noise Parameter Measurements Using Agilent N5245A-series PNA-X with Noise Option 029 5C-088

Maury Application Notes Library

Maury软件和系统应用笔记。 Maury Application Notes Library