Editing Low-noise amplifier (section)

=== Biasing ===
{{Expand section|date=August 2019}}
Another design issue is the noise introduced by [[Bipolar transistor biasing|biasing networks]]. In communication circuits, biasing networks play a critical role in establishing stable operating points for active components, but they also introduce noise. The primary types of noise introduced by these networks are thermal noise and flicker noise. Thermal noise arises from resistive elements in the network, which is inevitable as any resistive component generates noise due to the random motion of charge carriers. This type of noise is especially problematic at high frequencies. Flicker noise, also known as 1/f noise, is related to the current flow through devices like transistors and becomes more significant at lower frequencies.<ref>{{Citation |last1=Honnaiah |first1=Puneeth Jubba |title=Design of a Low Noise Amplifier |date=2019-12-30 |url=https://arxiv.org/abs/1912.13029 |access-date=2024-09-16 |arxiv=1912.13029 |last2=Reddy |first2=Shridhar}}</ref>

For instance, in low-noise amplifiers (LNA), the biasing network must be carefully designed to minimize the impact of noise on the overall performance. Improper biasing can lead to increased noise figures, compromising the signal-to-noise ratio and degrading communication system performance. The design and selection of components within the bias network are therefore crucial to ensuring low-noise operation, particularly in systems that rely on amplifying weak signals.<ref>{{Cite journal |last1=Zhao |first1=Jinxiang |last2=Wang |first2=Feng |last3=Yu |first3=Hanchao |last4=Zhang |first4=Shengli |last5=Wang |first5=Kuisong |last6=Liu |first6=Chang |last7=Wan |first7=Jing |last8=Liang |first8=Xiaoxin |last9=Yan |first9=Yuepeng |date=2022-02-18 |title=Analysis and Design of a Wideband Low-Noise Amplifier with Bias and Parasitic Parameters Derived Wide Bandpass Matching Networks |journal=Electronics |language=en |volume=11 |issue=4 |pages=633 |doi=10.3390/electronics11040633 |doi-access=free |issn=2079-9292}}</ref>

In addition, matching networks and careful biasing techniques, such as using low-noise transistors and optimizing impedance matching, help mitigate the noise effects introduced by bias circuits<!-- Motchenbacher -->