No Noise Is Good Noise: Noise Matching, Noise Canceling, and Maybe a Bit of Both for Wide-Band LNAs

Belostotski, Leonid

doi:10.1109/mmm.2016.2561438

Cited by 20 publications

(9 citation statements)

References 58 publications

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“…a i and b i are the incident and reflective waves, respectively. c i is the intrinsic noise wave [14]- [16]. incident noise waves [29] to the network in Fig.…”

Section: A Multiport Noise Figure and Parametersmentioning

confidence: 99%

“…We extract the noise parameters of an "effective" two-port device at a time, with the unused port terminated with a resistive load. These noise parameters are convertible to noise waves [14], [16] and vice versa. Figure 5: Three-port to two-port conversion through reflectionless termination of an unused port 1) Terminating Port 2: Consider terminating port 2 with a reflectionless load at ambient temperature as shown in Fig.…”

Section: B Three-port To Two-port Noise Wave Conversionmentioning

confidence: 99%

“…A related approach is use room temperature load as hot source and cooled load as cold source [13]. The other is to use knowledge of LNA noise parameters and the antenna reflection coefficient (Γ AUT ) to calculate the noise temperature, T LNA (Γ s ) [14]- [16]. However, these standard approaches are not easily applicable to low-frequency radio astronomy (tens to hundreds of MHz).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Cold-Source Noise Measurement of a Differential Input Single-Ended Output Low-Noise Amplifier Connected to a Low-Frequency Radio Astronomy Antenna

Sutinjo

Ung

Juswardy

2018

IEEE Trans. Antennas Propagat.

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We present two methods for measuring the noise temperature of a differential input single-ended output (DISO) Low-Noise Amplifier (LNA) connected to an antenna. The first method is direct measurement of the DISO LNA and antenna in an anechoic chamber at ambient temperature. The second is a simple and low-cost noise parameter extraction of the DISO device using a coaxial long cable. The reconstruction of the DISO noise parameter from the noise wave measurements of the DISO LNA with one terminated input port is discussed in detail. We successfully applied these methods to the Murchison Widefield Array LNA and antenna.

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“…a i and b i are the incident and reflective waves, respectively. c i is the intrinsic noise wave [14]- [16]. incident noise waves [29] to the network in Fig.…”

Section: A Multiport Noise Figure and Parametersmentioning

confidence: 99%

Section: B Three-port To Two-port Noise Wave Conversionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Cold-Source Noise Measurement of a Differential Input Single-Ended Output Low-Noise Amplifier Connected to a Low-Frequency Radio Astronomy Antenna

Sutinjo

Ung

Juswardy

2018

IEEE Trans. Antennas Propagat.

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“…On the other hand, the corresponding terms of the two noise wave vectors

{bolda}_{normaln} = false[a_{n,1} \dots a_{n,m} false]

and

{boldb}_{normaln} = false[b_{n,1} \dots b_{n,m} false]

that are emanating from each LNA are correlated. This correlation is advantageous and is used for minimizing the receiver noise by appropriately scaling and phasing

b_{n}

so that when combined with

a_{n}

in the receiver their correlated portion destructively interfered [20]. This minimization is accomplished by reflecting

b_{n}

either off an antenna with a reflection coefficient

{normalΓ}_{normals} = {normalΓ}_{opt}

in a single‐antenna system or off an effective reflection coefficient, known as

Γ_{act}

, when

{normalΓ}_{act} = {normalΓ}_{opt}

in a multi‐element array.…”

Section: Trec and γAct Dependence On Bandwidthmentioning

confidence: 99%

Impact of bandwidth on antenna‐array noise matching

Ali

Belostotski

Messier

et al. 2021

Electronics Letters

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This letter expands the treatments of wideband noise analysis of antenna arrays by including bandwidth effects on beam-equivalent receiver noise temperature, T rec , and the active reflection coefficient, act. The particular focus of the letter is on receiver noise decorrelation in wideband systems having noise bandwidth f B 1 Hz. The new analysis and simulations show increase in T rec and the departure of act from that obtained using contemporary analyses for f B =1 Hz. Although the paper also shows that for many applications over moderate bandwidths and close connection between the receiver and array the influence of f B on T rec is not significant, the simulations of a 71-element array demonstrate that the noise decorrelation due to wide f B can result in tens of percent (as much as 45.5% in simulations described in this letter) increase in T rec above the low-noise amplifier minimum noise temperature, which should be taken into account at the design stage of ultrawide band systems, such as those under investigation by, for example, the Defense Advanced Research Project Agency (DARPA) in its wideband adaptive RF protection (WARP) program and ultra-sensitive active electronically scanned array (AESA) radars for tracking stealth objects.

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“…Although the circuit diagram in Fig. 2(b) is a helpful generality of NC LNAs, the structure of new NC LNAs requires some extra knowledge [7] [10]. The solution to the NC principle is the recognition of the two nodes in a circuit where the signal appears with the same polarity but the instantaneous noise appears with opposite polarity [7].…”

Section: Mahesh Mudavath K Hari Kishore Sanjay Madupu Prashanth Chmentioning

confidence: 99%

Low Noise Amplifier Design of CMOS Inductorless with Noise Cancellation Technique

Mudavath,

Kishore,

Madupu

et al. 2019

IJEAT

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This article presents the Low Noise Amplifier (LNA) design of CMOS Inductorless with noise cancellation (NC) technique for portable wireless receivers. An Inductorless CMOS LNA for multi-standard wireless applications with lessarea, single-chip is presented. This NC technique is used to cancel out the noise involvement in LNAs at the output of matching device. The proposed Inductorless CMOS LNA designed in a CMOS 45nm GPDK technology process. The simulated results within the frequency range of 1.04GHz-1.8GHz are considered here. The maximum gain has achieved 20dB @ 1.04GHz, 23dB @ 1.8GHz and a low NF of 1.2dB @ 1.04GHz, 0.6dB @ 1.8GHz. The input and output reflection coefficients are obtained as less than -10dB it is desirable value to fit in this LNA.

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No Noise Is Good Noise: Noise Matching, Noise Canceling, and Maybe a Bit of Both for Wide-Band LNAs

Cited by 20 publications

References 58 publications

Cold-Source Noise Measurement of a Differential Input Single-Ended Output Low-Noise Amplifier Connected to a Low-Frequency Radio Astronomy Antenna

Cold-Source Noise Measurement of a Differential Input Single-Ended Output Low-Noise Amplifier Connected to a Low-Frequency Radio Astronomy Antenna

Impact of bandwidth on antenna‐array noise matching

Low Noise Amplifier Design of CMOS Inductorless with Noise Cancellation Technique

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