• Journal of Advanced Navigation Technology
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• v.13 no.1
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• pp.48-53
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• 2009

The CMOS RF front-end for Global Positioning System(GPS)are implemented in 1P8M CMOS $0.13{\mu}m$ process. The LNAs consist of LNA1 with high gain and low NF, and LNA2 with low gain and high IIP3 for supporting operation with active and passive antenna. the measured performances of both LNAs are 16.4/13.8 dB gain, 1.4/1.68 dB NF, and -8/-4.4 dBm IIP3 with 3.2/2 mA form 1.2 V supply, respectively. The quadrature downconversion mixer is followed by transimpedance amplifier with gain controllability from 27.5 to 41 dB. The front-end performances in LNA1 mode are 39.8 dB conversion gain, 2.2 dB NF, and -33.4 dBm IIP3 with 6.6 mW power consumption.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.23 no.3
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• pp.361-366
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• 2012

This paper proposes a low power capacitor cross-coupled 5.2 GHz band low noise amplifier(LNA) using the current-reused topology with the TSMC 0.18 ${\mu}m$ CMOS process. The proposed 5.2 GHz band LNA uses a capacitor cross-coupled $g_m$-boosting method for reducing current flow of circuit and a current-reused topology to decrease total power dissipation. The parallel LC networks are used to reduce size of spiral inductors. The simulation results show high gain of 17.4 dB and noise figure(NF) of 2.7 dB for 5.2 GHz.

• Smart Media Journal
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• v.4 no.2
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• pp.55-61
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• 2015

A bandwidth-enhanced ultra-wide band (UWB) CMOS balun-LNA is implemented as a part of a software defined radio (SDR) receiver which supports multi-band and multi-standard. The proposed balun-LNA is composed of a single-to-differential converter, a differential-to-single voltage summer with inductive shunt peaking, a negative feedback network, and a differential output buffer with composite common-drain (CD) and common-source (CS) amplifiers. By feeding the single-ended output of the voltage summer to the input of the LNA through a feedback network, a wideband balun-LNA exploiting negative feedback is implemented. By adopting a source follower-based inductive shunt peaking, the proposed balun-LNA achieves a wider gain bandwidth. Two LNA design examples are presented to demonstrate the usefulness of the proposed approach. The LNA I adopts the CS amplifier with a common gate common source (CGCS) balun load as the S-to-D converter for high gain and low noise figure (NF) and the LNA II uses the differential amplifier with the ac-grounded second input terminal as the S-to-D converter for high second-order input-referred intercept point (IIP2). The 3 dB gain bandwidth of the proposed balun-LNA (LNA I) is above 5 GHz and the NF is below 4 dB from 100 MHz to 5 GHz. An average power gain of 18 dB and an IIP3 of -8 ~ -2 dBm are obtained. In simulation, IIP2 of the LNA II is at least 5 dB higher than that of the LNA I with same power consumption.

• Journal of the Institute of Convergence Signal Processing
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• v.15 no.2
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• pp.64-69
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• 2014

Ultrasound system is one of the complex wireless signal processing systems that are widely used in the fields of modern industry such as medical diagnostics, underwater communications, and sensor-networks. Miniaturization of ultrasound system has been raging recently. In this paper, a hybrid LNA that is suitable for miniaturization and mobile diagnostic ultrasound system has been developed. The proposed LNA has low noise figure of less than 5dB, and the feedback resistor is designed to be electrically adjusted in order to attain the impedance-matching for various ultrasound transducers. It supports the whole ultrasound frequencies from 10KHz to 150MHz frequency band and also provides sleep modes. A gain from -18.8 to -29.5 dB is achieved by adjusting each transducer to fit the system character. Power consumption can be reduced up to 90% in similar performance as compared to the existing LNA.

• The Journal of the Korea institute of electronic communication sciences
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• v.9 no.9
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• pp.1027-1034
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• 2014

We present the Low Power Broadband Low noise amplifier(LNA) that can be applied a whole bandwidth from 3G to 4G LTE. This multi input LNA was designed to steadily amplify through a multi input method regardless the size of the input signal and operate on a wide range of frequency band from a standard 3G CDMA band 1.2GHz to LTE band 2.5GHz. The designed LNA consumes an average of 6mA on a 1.2V power supply and this was affirmed using computer simulation tests. The amplification which was corresponded to the lowest input signal is at a maximum of 20dB and was able to obtain the minimum value of the gain of -10dB. The Noise figure is less than 3dB at a High-gain mode and is less than 15dB at a Low-gain mode.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.1597_1598
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• 2009

In this paper, the techniques and design focus of flexible gain coltrol of LAN(Low Noise Amplifier) using the TSMC 0.18um CMOS process. The design frequency set up a standard on 2.4GHz that is used in Zigbee system. The design concepts a basic Cascode LNA techniques and a swiching circuit consisted of 4 NMOS of load resistance, which convert the output impedenceby tuning on or off. The result show the gain change by NMOS operated swich. The simulation result is that Gain is 10.23~12.96dB and NF(Noise Figure) is 1.41~1.47dB.

• Proceedings of the IEEK Conference
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• 2002.06a
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• pp.451-454
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• 2002

In this paper, a low-noise amplifier is designed and fabricated using the HJFET for the reception of the Ku-band satellite broadcast signals. The optimum input and output reflection coefficients of each amplifier stage are obtained by the trade-off between the stable gain and the noise figure circle. The amplifier performance is simulated and optimized using a microwave CAD software. The designed amplifier is fabricated and tested. Results of the test show a gain of 17.0 dB, a gain flatness of less than $\pm$2.BdB, the noise figure of less than 1.0 dB, and the input and output reflection coefficient of less than -10 dB.

• Proceedings of the IEEK Conference
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• 1998.10a
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• pp.671-674
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• 1998

본 논문에서는 최근 급격히 수요가 증대하고 있는 휴대용 단말기의 수신기 선단에 사용되는 저잡음 증폭기(LNA)를 0.6㎛ CMOS공정 파라미터를 사용하여 설계하였다. 설계된 LNA는 전원 전압 ±1.2v, 900㎒대에서 동작하는 전류 재사용방식의 적층 CMOS구조로서 시뮬레이션 결과 전력소모가 9.45㎽, 전력이득은 23.7dB, 선형지수 OIP3는 7.6dBm을 나타내어 저전력 저잡음 특성을 얻었다. 사용된 인덕터의 Q는 3.5이다.

• Journal of Positioning, Navigation, and Timing
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• v.7 no.2
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• pp.105-112
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• 2018

This paper manufactured an active GPS antenna for ground vehicles and presented a method to verify the performances of the antenna and component technology of the low noise amplifier (LNA) board manufacturing. The manufactured GPS antenna is an active antenna where microstrip patch and LNA board were combined. The main performances were standing wave ratio, antenna gain, and axial ratio, and all satisfied the target specifications. The proposed component technology can be utilized as a basis data in which the performance of LNA board can be compensated in the mass production process inspection, and employed as a method to verify whether antennas are properly working in environmental tests.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 2003.11a
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• pp.481-486
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• 2003

RF 전파는 신호레벨이 비교적 작고 간섭 현상에 매우 민감한 특성을 가지고 있다. 따라서 이러한 미소한 입력전파의 수신시 수신기 전체의 감도를 높이고 잡음을 줄일 목적으로 사용되는 고주파 증폭기가 저잡음 증폭기이다. 본 논문에서는 FET 증폭기를 이용한 LNA설계시 직렬 궤환에 의한 최소잡음과 최소입력정재파비의 최적 설계 파라미터를 검증한다. LNA의 기본적 특성 분석과 IMT-2000 구역의 1. 9GHZ대의 휴대단말기용 LNA와 블루투스용 2.4GHz대의 LNA 그리고, 지능형교통시스템에 응용되는 5.8GHz대의 단거리전용통신 LNA를 구현하고 각 주파수별로 특성이 다른 BJT, FET 증폭기를 적용하여 설계하고 성능 분석 및 최적의 파라미터를 도출하였다.