• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2005년도 추계종합학술대회
• /
• pp.575-578
• /
• 2005

We report on a low-cost V-band wireless transceiver with no use of any local oscillator in the receiver block using a self-heterodyne architecture. V-band Microwave monolithic IC (MMIC) modules were developed to demonstrate the wireless transceiver using coplanar waveguide (CPW) and GaAs PHEMT technologies. The MMIC modules such as the MMIC low noise amplifier (LNA), medium power amplifier (MPA) and the up/down-mixer were installed in the transceiver system. To interface the MMIC chips with the component modules for the transceiver system, CPW-to-waveguide fin-line transition modules of WR-15 type were designed and fabricated. The fabricated LNA modules showed a $S_{21}$ gain of 8.4 dB and a noise figure of 5.6 dB at 58 GHz. The MPA modules exhibited a gain of 6.9 dB and a $P_1$ $_{dB}$ of 5.4 dBm at 58 GHz. The conversion losses of the up-mixer and the down-mixer module were 14.3 dB at a LO power of 15 dBm, and 19.7 dB at a LO power of 0 dBm, respectively. From the measurement of V-band wireless transceiver, a conversion gain of 0.2 dB and a P $_{1dB}$ of 5.2 dBm were obtained in the transmitter block. The receiver block showed a conversion gain of 2.1 dB and a P $_{1dB}$ of -18.6 dBm. The wireless transceiver system demonstrated a successful data transfer within a distance of 5 meters.

• JSTS:Journal of Semiconductor Technology and Science
• /
• 제5권3호
• /
• pp.210-219
• /
• 2005

We report on a low-cost V-band wireless transceiver with no use of any local oscillator in the receiver block using a self-heterodyne architecture. V-band millimeter-wave monolithic IC (MMIC) modules were developed to demonstrate the wireless transceiver using coplanar waveguide (CPW) and GaAs PHEMT technologies. The MMIC modules such as the MMIC low noise amplifier (LNA), medium power amplifier (MPA) and the up/down-mixer were installed in the transceiver system. To interface the MMIC chips with the component modules for the transceiver system, CPW-to-waveguide fin-line transition modules of WR-15 type were designed and fabricated. The fabricated LNA modules showed a $S_{21}$ gain of 8.4 dB and a noise figure of 5.6 dB at 58 GHz. The MPA modules exhibited a gain of 6.9 dB and a $P_{1dB}$ of 5.4 dBm at 58 GHz. The conversion losses of the up-mixer and the down-mixer module were 14.3 dB at a LO power of 15 dBm, and 19.7 dB at a LO power of 0 dBm, respectively. From the measurement of V-band wireless transceiver, a conversion gain of 0.2 dB and a $P_{1dB}$ of 5.2 dBm were obtained in the transmitter block. The receiver block showed a conversion gain of 2.1 dB and a $P_{1dB}$ of -18.6 dBm. The wireless transceiver system demonstrated a successful data transfer within a distance of 5 meters.

• 한국통신학회논문지
• /
• 제27권5C호
• /
• pp.522-529
• /
• 2002

GaAs pHEMT 기술로 V-band 수신단 각 MMIC 회로들을 설계 제작하였다. 또한 이를 집적하여 V-band downconverter module을 제작하였다. 제작된 downconverter는 24 dBm의 출력을 내는 LO 구동 전력 증폭기, 20dB의 소신호 이득을 가지는 저잡음증폭기, -1.6dBm의 출력을 내는 active parallel type의 발진기, 6 dB 이상의 변환이득 특성을 나타내는 cascode type의 혼합기로 구성되어 있다. 이처럼 혼합기의 우수한 변환이득 특성은 밀리미터파 대역에서 변환 이득 특성을 키우기 위해 반드시 필요한 거대한 IF buffer amplifier의 필요를 없애 주었다. 완성된 downconverter module의 측정결과 별도의 IF buffer amplifier없이 57.5 GHz와 61.7 GHz 사이에서 20 dB 이상의 높은 변환이득을 얻을 수 있었다.

• 마이크로전자및패키징학회지
• /
• 제6권3호
• /
• pp.1-7
• /
• 1999

본 연구에서는 900MHz대역 수신기용으로 선행 개발되어진 RF 칩세트를 장착한 RF 특성평가 보드를 개발하였으며, 환경평가시험을 수행하였다. 선행 개발되어진 RF-IC 칩에는 저잡음증폭기, 하향변조 주파수혼합기, AGC Amp, SW-CAP 필터 등을 포함하고 있으며, 이에 따른 정합회로와 RF/IF SAW 필터, 듀플렉서 필터 및 전원공급회로를 RF 특성평가보드에 첨가하여 제작하였다. 공급전원은 2.7에서 3.6V이며, RF 보드의 소모전류는 42mA로 나타났으며, 동작 주파수는 RF 입력이 925~960MHz으로 제작, 측정되었다. 측정결과 일반적인 900MHz용 디지털 이동통신단말기의 RF 수신특성과 유사하게 양호한 결과를 보였다.

• ETRI Journal
• /
• 제29권4호
• /
• pp.421-429
• /
• 2007

This paper presents a direct-conversion CMOS transceiver for fully digital DS-UWB systems. The transceiver includes all of the radio building blocks, such as a T/R switch, a low noise amplifier, an I/Q demodulator, a low pass filter, a variable gain amplifier as a receiver, the same receiver blocks as a transmitter including a phase-locked loop (PLL), and a voltage controlled oscillator (VCO). A single-ended-to-differential converter is implemented in the down-conversion mixer and a differential-to-single-ended converter is implemented in the driver amplifier stage. The chip is fabricated on a 9.0 $mm^2$ die using standard 0.18 ${\mu}m$ CMOS technology and a 64-pin MicroLead Frame package. Experimental results show the total current consumption is 143 mA including the PLL and VCO. The chip has a 3.5 dB receiver gain flatness at the 660 MHz bandwidth. These results indicate that the architecture and circuits are adaptable to the implementation of a wideband, low-power, and high-speed wireless personal area network.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2006년도 하계종합학술대회
• /
• pp.615-616
• /
• 2006

Nowadays, the need of multi-mode/multi-band transceiver is rapidly increasing, so we design a direct conversion RF front-end for multi-mode/multi-band receiver that support WCDMA/CDMA2000/WIBRO standard. It consists of variable gain reconfigurable LNA and single input double balanced Mixer and complementary differential LC Oscillator. The circuit is implemented in 0.18 um RF CMOS technology and is suitable for low-cost mode/multi-band.

• 한국전자파학회:학술대회논문집
• /
• 한국전자파학회 2002년도 종합학술발표회 논문집 Vol.12 No.1
• /
• pp.69-73
• /
• 2002

We have designed and fabricated a low-cost, V-band CPW receiver chip set using GaAs PHEMT technology for the application of millimeter-wave wireless communication systems. Low noise amplifiers and down-converters were developed for this chip set. The fabricated low noise amplifier showed an S$\sub$21/ gain of 14.9 ㏈ at 60 ㎓ and a noise figure of 4.1 ㏈ at 52 ㎓. The down-converter exhibited a high conversion gain of 2 ㏈ at the low LO Power of 0 ㏈m. This work demonstrates that the GaAs PHEMT technology is a viable low-cost solution for V-band applications.

• 한국항행학회논문지
• /
• 제1권1호
• /
• pp.23-34
• /
• 1997

다채널 디지털 GPS 수신기를 구현하기 위하여 RF-to-IF엔진 (엔진 1), 신호처리 엔진 (엔진 2), 항법 소프트웨어를 개발하였다. 고속 SiGe HBT률 이용한 LNA, 믹서, VCO 등의 하이브리드 IC를 COB형태로 구현하여 엔진 1 보드에 부착하였다. 6채널 디지털 상관기를 클락 및 마이크로프로세서 인터페이스와 함께 Altera Flex 10K FPGA 및 ASIC 기술로 구현하였다. 항법 소프트웨어는 GPS 신호의 트래킹 및 획득을 위한 상관기 제어, 메시지 저장, 위치 계산 등을 수행한다. 개발된 GPS수신기는 단일 채널 신호를 발생하는 STR2770 시뮬레이터를 이용하여 테스트하였는데, 성공적인 항법 신호획득 및 위치 계산 결과를 확인하였다.

• JSTS:Journal of Semiconductor Technology and Science
• /
• 제16권1호
• /
• pp.126-142
• /
• 2016

This paper presents a wide-frequency-range, low-power transceiver with an automatic impedance-matching calibration for TV-white-space (TVWS) application. The wide-range automatic impedance matching calibration (AIMC) is proposed for the Drive Amplifier (DA) and LNA. The optimal $S_{22}$ and $S_{11}$ matching capacitances are selected in the DA and LNA, respectively. Also, the Single Pole Double Throw (SPDT) switch is integrated to share the antenna and matching network between the transmitter and receiver, thereby minimizing the systemic cost. An N-path filter is proposed to reject the large interferers in the TVWS frequency band. The current-driven mixer with a 25% duty LO generator is designed to achieve the high-gain and low-noise figures; also, the frequency synthesizer is designed to generate the wide-range LO signals, and it is used to implement the FSK modulation with a programmable loop bandwidth for multi-rate communication. The TVWS transceiver is implemented in $0.13{\mu}m$, 1-poly, 6-metal CMOS technology. The die area of the transceiver is $4mm{\times}3mm$. The power consumption levels of the transmitter and receiver are 64.35 mW and 39.8 mW, respectively, when the output-power level of the transmitter is +10 dBm at a supply voltage of 3.3 V. The phase noise of the PLL output at Band 2 is -128.3 dBc/Hz with a 1 MHz offset.

• 디지털융복합연구
• /
• 제10권10호
• /
• pp.313-318
• /
• 2012

본 논문에서는 X-band 대역용 인체감지센서에 적용될 저 잡음 송수신기 설계 방법을 제안 하였다. 제안된 송수신기에는 기존 송수신기의 출력 신호가 수신 단으로 유입되는 것을 줄이기 위한 회로가 추가되었다. 잡음 제거회로는 분배기와 $90^{\circ}$위상 천이기를 포함하는 Hittite HMC908LC5(I/Q down converter)가 사용되었다. 송수신기 회로와 안테나는 CST MWS를 사용하여 시뮬레이션 하였고 FR-4 기판(h=1.0mm, ${\varepsilon}_r$=4.4)을 사용하여 제작하였다. 설계된 안테나의 특성이 인체감지용 센서에 사용되기에 적합하며 제안된 송수신기와 기존에 사용되고 있는 송수신기의 출력 특성을 비교 한 결과 동등한 특성을 얻었다.