scholarly journals Аdaptive broadband low-noise RF amplifier

Doklady BGUIR ◽  
2020 ◽  
Vol 18 (6) ◽  
pp. 66-74
Author(s):  
I. Yu. Malevich ◽  
P. V. Zayats
Keyword(s):  
Dynamic Range ◽  
Noise Figure ◽  
Low Noise ◽  
Technical Solution ◽  
Radio Communication ◽  
Switched Networks ◽  
Rf Amplifier ◽  
The Creation ◽  
Transformer Feedback ◽  
Overload Capacity

Adaptive broadband low-noise radio frequency amplifiers (ABLNRFA) are widely used in the construction of systems for protecting radio receiving paths from nonlinear damage in a non-stationary electromagnetic environment (EME). One of the promising focus areas on the creation of ABLNRFA is the development of devices in the class of circuits with switched networks. The creation of such devices has certain features, since, along with the need to ensure a low noise figure and digital control of the regulation characteristic, it is required to provide high linearity and a large dynamic range (DR) of the device. This paper presents the results of the logical-heuristic synthesis of ABLNRFA with an adaptively adjustable transducer gain, which changes due to switching of transformer feedback circuits. In order to check the functional and technical characteristics of the synthesized ABLNRFA and optimize its parameters, a model was developed and studied in the ADS environment. The proposed ABLNRFA technical solution provides a discrete (23, 14, 10 and 5 dB) wideband change in the transmission coefficient, while the DR for third-order intermodulation in terms of a 1 MHz band is 83, 92, 98 and 104 dB, respectively. A step change in the transducer gain in the circuit of the lossless feedback circuit developed by ABLNRFA avoids the accumulation of additional noise in the structure and provides a low-noise figure that does not exceed 1 dB. The technical characteristics of ABLNRFA allow one to adaptively increase the overload capacity of the radio receiving path with a proportional expansion of its DR in the conditions of non-stationary EME, and thus increase the efficiency of the level protection system against nonlinear damage to the receiving paths of radio communication, radar and radio navigation.

Design of a Front-End for Satellite Receiver

2016 ◽  
Vol 6 (5) ◽  
pp. 2282 ◽  
Author(s):  
Tran Van Hoi ◽  
Ngo Thi Lanh ◽  
Nguyen Xuan Truong ◽  
Nguyen Huu Duc ◽  
Bach Gia Duong
Keyword(s):  
Dynamic Range ◽  
Noise Figure ◽  
High Sensitivity ◽  
Wide Band ◽  
Local Oscillator ◽  
Low Noise ◽  
Voltage Controlled Oscillator ◽  
Front End ◽  
L Band ◽  
Satellite Receiver

<p>This paper focuses on the design and implementation of a front-end for a Vinasat satellite receiver with auto-searching mechanism and auto-tracking satellite. The front-end consists of a C-band low-noise block down-converter and a L-band receiver. The receiver is designed to meet the requirements about wide-band, high sensitivity, large dynamic range, low noise figure. To reduce noise figure and increase bandwidth, the C-band low-noise amplifier is designed using T-type of matching network with negative feedback and the L-band LNA is designed using cascoded techniques. The local oscillator uses a voltage controlled oscillator combine phase locked loop to reduce the phase noise and select channels. The front-end has successfully been designed and fabricated with parameters: Input frequency is C-band; sensitivity is greater than -130 dBm for C-band receiver and is greater than -110dBm for L-band receiver; output signals are AM/FM demodulation, I/Q demodulation, baseband signals.</p>

scholarly journals Design of a Front-End for Satellite Receiver

2016 ◽  
Vol 6 (5) ◽  
pp. 2282
Author(s):  
Tran Van Hoi ◽  
Ngo Thi Lanh ◽  
Nguyen Xuan Truong ◽  
Nguyen Huu Duc ◽  
Bach Gia Duong
Keyword(s):  
Dynamic Range ◽  
Noise Figure ◽  
High Sensitivity ◽  
Wide Band ◽  
Local Oscillator ◽  
Low Noise ◽  
Voltage Controlled Oscillator ◽  
Front End ◽  
L Band ◽  
Satellite Receiver

<p>This paper focuses on the design and implementation of a front-end for a Vinasat satellite receiver with auto-searching mechanism and auto-tracking satellite. The front-end consists of a C-band low-noise block down-converter and a L-band receiver. The receiver is designed to meet the requirements about wide-band, high sensitivity, large dynamic range, low noise figure. To reduce noise figure and increase bandwidth, the C-band low-noise amplifier is designed using T-type of matching network with negative feedback and the L-band LNA is designed using cascoded techniques. The local oscillator uses a voltage controlled oscillator combine phase locked loop to reduce the phase noise and select channels. The front-end has successfully been designed and fabricated with parameters: Input frequency is C-band; sensitivity is greater than -130 dBm for C-band receiver and is greater than -110dBm for L-band receiver; output signals are AM/FM demodulation, I/Q demodulation, baseband signals.</p>

DESIGN AND OPTIMIZATION OF A FULLY DIFFERENTIAL CMOS VARIABLE-GAIN LNA WITH DIFFERENTIAL EVOLUTION ALGORITHM FOR WLAN APPLICATIONS

2014 ◽  
Vol 23 (09) ◽  
pp. 1450124 ◽  
Author(s):  
SOHEYL ZIABAKHSH ◽  
HOSEIN ALAVI-RAD ◽  
MORTEZA ALINIA AHANDANI ◽  
MUSTAPHA C. E. YAGOUB
Keyword(s):  
Differential Evolution ◽  
Dynamic Range ◽  
Noise Figure ◽  
Differential Evolution Algorithm ◽  
High Dynamic Range ◽  
Low Noise ◽  
Design And Optimization ◽  
Variable Gain ◽  
Fully Differential ◽  
Evolution Algorithm

In this paper, we optimized the performance of a 2.4 GHz variable gain low-noise amplifier for WLAN applications which provides high dynamic range with relatively low power consumption. First, the differential evolution algorithm was used to optimize the width of input transistors, then the tunable on-chip switching stage method was applied to control the amplifier gain when the input signal increases. The optimization was performed in terms of gain, noise figure (NF), IIP3 and power dissipation. The LNA has achieved a variable gain from 16.55 to 20.45 dB with excellent NF between 1.63 and 1.74 dB. Furthermore, the proposed circuit achieves a third order input intercept point of 6.6 dBm. It consumes only 10 mW from a 1.5 V supply.

A 2.9 mm2 Highly Integrated Low Noise GPS Receiver in 0.18-μm CMOS Technology

2015 ◽  
Vol 24 (03) ◽  
pp. 1550036 ◽  
Author(s):  
Zhengfei Hu ◽  
Li Zhang ◽  
Mindi Huang
Keyword(s):  
Frequency Synthesizer ◽  
Dynamic Range ◽  
Noise Figure ◽  
Gain Control ◽  
Cmos Technology ◽  
Low Noise ◽  
Band Pass Filter ◽  
Gps Receiver ◽  
Voltage Reference ◽  
Pass Filter

An L1 band highly integrated low noise GPS receiver in 0.18-μm CMOS is presented in this paper. The receiver adopts double conversion structure and two dynamic range control modes of variable gain amplifier (VGA) and programmable gain amplifier (PGA). The receiver includes the blocks of LNA, down-conversion mixers, band pass filter, received signal strength indicator (RSSI), VGA, PGA, 2-bit ADC, two frequency synthesizers and so on. The LNA adopts source inductive degeneration technique to achieve good noise performance, and a novel positive feedback capacitor is introduced to enhance gain. The novel gain-boosting charge pump (CP) structure acquires accurate current matching of 0.1% error which improves the output phase noise of frequency synthesizer. The measured radio performances of noise figure (NF) is only 4 dB and the maximum gain is 110 dB. The gain control range achieves 50 dB provided by PGA and VGA. The receiver occupies an area of 1.875 mm × 1.575 mm including all needed voltage reference and the 1.8 V low dropout regulator.

scholarly journals Extending OTDR Distance Span by External Front-End Optical Preamplifier

Electronics ◽  
2021 ◽  
Vol 10 (18) ◽  
pp. 2275
Author(s):  
Adriana Lipovac ◽  
Vlatko Lipovac ◽  
Mirza Hamza ◽  
Vedran Batoš
Keyword(s):  
Dynamic Range ◽  
Noise Figure ◽  
Cost Effective ◽  
Optical Amplifier ◽  
High Gain ◽  
Low Noise ◽  
Long Distance ◽  
Optical Time Domain Reflectometer ◽  
Front End ◽  
Extension Model

Optical time-domain reflectometer (OTDR) is used to characterize fiber optic links by identifying and localizing various refractive and reflective events such as breaks, splices, and connectors, and measuring insertion/return loss and fiber length. Essentially, OTDR inserts a pulsed signal into the fiber, from which a small portion that is commonly referred to as Rayleigh backscatter, is continuously reflected back with appropriate delays of the reflections expressed as the power loss versus distance, by conveniently scaling the time axis. Specifically, for long-distance events visibility and measurement accuracy, the crucial OTDR attribute is dynamic range, which determines how far downstream the fiber can the strongest transmitted optical pulse reach. As many older-generation but still operable OTDR units have insufficient dynamic range to test the far-end of longer fibers, we propose a simple and cost-effective solution to reactivate such an OTDR by inserting a low-noise high-gain optical preamplifier in front of it to lower the noise figure and thereby the noise floor. Accordingly, we developed an appropriate dynamic range and distance span extension model which provided the exemplar prediction values of 30 dB and 75 km, respectively, for the fiber under test at 1550 nm. These values were found to closely match the dynamic range and distance span extensions obtained for the same values of the relevant parameters of interest by the preliminary practical OTDR measurements conducted with the front-end EDFA optical amplifier, relative to the measurements with the OTDR alone. This preliminary verifies that the proposed concept enables a significantly longer distance span than the OTDR alone. We believe that the preliminary results reported here could serve as a hint and a framework for a more comprehensive test strategy in terms of both test diversification and repeating rate, which can be implemented in a network operator environment or professional lab.

scholarly journals Methods of structural and functional implementation of ultra-wide range receiving paths

Doklady BGUIR ◽  
2020 ◽  
Vol 18 (7) ◽  
pp. 23-30
Author(s):  
D. V. Arkhipenkov ◽  
I. I. Zabenkov ◽  
S. S. Salanovich
Keyword(s):  
Dynamic Range ◽  
Noise Figure ◽  
Low Noise ◽  
Radio Receiver ◽  
Monitoring Systems ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Radio Monitoring ◽  
Wide Range ◽  
Element Base

Currently, radio monitoring systems are being actively improved in the direction of expanding the range of operating frequencies and the width of the spectrum of processed signals, which in some cases requires changing approaches to the design of their receiving devices. The purpose of the article is to substantiate the methods and circuit design options for implementing a receiver of an ultra-wide-range radio monitoring system and to justify the sequence of selecting the element base and calculating the parameters of the receiving path. The research proves expedient to choose the infradine structure of the radio receiving path as a basis, in which the frequency of the mirror channel is located far from the frequency of the main channel, so the mirror channel is easily suppressed by a simple low-pass filter. One of the main problems that arise when designing ultra-wideband radio receivers is the simultaneous provision of a large dynamic range and a low noise figure. To reduce the noise figure, a variant of constructing a path was proposed, starting with a low-noise amplifier with increased parameters of nonlinear selectivity, which is acceptable if there is a low probability of intermodulation combinations. The article suggests a receiver with an operating frequency range of 0.5–18 GHz and an analogto-digital converter with a speed of up to 10.4 GSPS. The element base was selected for the receiving devices and the main parameters of the path were calculated. A number of examples are used to analyze the ways to increase the dynamic range of a radio receiver and the influence of element base parameters on the device performance. The main technical characteristics of the radio receiver for effective operation of modern radio monitoring systems and the ways to increase the dynamic range thereof are described.

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