• Proceedings of the IEEK Conference
• /
• 2001.06b
• /
• pp.137-140
• /
• 2001

This paper shows an asynchronous comparator circuit for 1.2Gbps signal receiver that converts 1.2Gbps data rate input signals with less than 100㎷ swing to on-chip CMOS compatible voltage levels in a 0.35${\mu}{\textrm}{m}$ CMOS process. Folded-cascode nMOS input stage with source-coupled pMOS input stage cover rail-to-rail input common-mode range. Drastic gain-bandwidth increment due to gain-boosting stage with positive-feedback latch as well as wide input common-mode range make designed circuit be suitable for a fully differential signal receiver. HSPICE simulation results show that worst-case sensitivity is less than 20㎷ and maximum propagation delay is 640-psec. And also we verified 3.97㎽ power consumption with 150㎷ differential swing amplitude at 1.2Gbps.

• Proceedings of the Optical Society of Korea Conference
• /
• 2004.02a
• /
• pp.284-285
• /
• 2004

We have developed a 10 Gbps receiver consist of an InGaAs PIN PD and an embedded TIA(transimpedance preamplifier). The receiver is assembled in a small form factor (SFF) Package. It shows f-3dB of 10 GHz and the sensitivity more than -20 dBm at 10$^{-10}$ BER (bit-error-rate) for 10 Gbps optical input signal of 2$^{31}$-1 PRBS (pseudo-random-bit-sequence).

• Journal of Positioning, Navigation, and Timing
• /
• v.5 no.1
• /
• pp.29-36
• /
• 2016

In this paper, performance on receivers of multilateration (MLAT) system that uses ADS-B signal, which is recently becoming popular, was analyzed to overcome shortcomings of existing aircraft flight control systems or reinforce the capabilities. A link budget was analyzed using a channel model in the airport environment with regard to Local Area Multilateration (LAM) for ground-controlled landing around the airport. In order to detect signals that arrived at the receiver successfully, sensitivity of receiver was analyzed using a signal-to-noise ratio (SNR) worksheet, and a method that improves accuracy of the distance measurement was proposed by adopting a peak estimation using sampling signals. Through simulations, optimum specifications of receivers were analyzed to have high precision positioning of LAM, and accuracy of LAM distance measurements was presented.

• Journal of the Institute of Electronics Engineers of Korea TC
• /
• v.48 no.3
• /
• pp.60-67
• /
• 2011

Visible light communication system transmits data by controlling light emission of LED and receives data through photo detecter, which is considered as one of strong candidates of next generation wireless communication systems. The transmission capacity of visible light communication system depends on light intensity emitted from LED, sensitivity of PD, distance between transmitter and receiver, angle of incidence at the receiver. In particular, the receiver's vertical and horizontal movement changes distance between transmitter and receiver and angle of incidence, which may degrades transmission capacity of system. In this paper, we propose an estimation algorithm of receiver's position and angle based on tracking of received light intensity for indoor visible light communication systems. The performance evaluation of proposed algorithm confirms that the estimation algorithm of receiver's position and angle is quite important for visible light communication system to improve its transmission capacity.

• The Journal of the Acoustical Society of Korea
• /
• v.36 no.4
• /
• pp.238-246
• /
• 2017

High frequency ultrasound imaging typically suffers from low sensitivity due to the small aperture of high frequency transducers and shallow imaging depth due to the frequency-dependent attenuation of ultrasound. These limitations should be overcome to obtain high-frequency, high- resolution ultrasound images. One practical solution to the problems is a high-performance signal receiver capable of detecting a very small signal and amplifying the signal with minimal electronic noise addition. This paper reports a recently developed low-noise, wideband ultrasound receiver for high-frequency, high-resolution ultrasound imaging. The developed receiver has an amplification gain of up to 73 dB and a variable amplification gain range of 48 dB over an operating frequency of 80 MHz. Also, it has an amplification gain flatness of ${\pm}1dB$. Due to these high performances, the developed receiver has a signal-to-noise ratio of at least 8.4 dB and a contrast-to-noise ratio of at least 3.7 dB higher than commercial receivers.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.21 no.3
• /
• pp.321-330
• /
• 2010

In this paper, the theoretical background and the specific implementation method of a compressive receiver for RFID signal detection as well as the design method of DDL(Dispersive Delay Line) and chirp LO are described. DDL, which is one of the main components of the compressive receiver, is designed to have $13{\mu}s$ dispersive delay time and 6 MHz bandwidth using the SAW technique based on $LiNbO_3$ material. The chirp LO is designed using DDS(Direct Digital Synthesizer). Also the compressive receiver is fabricated to be installed into the RFID reader. Test results show the maximum frequency error of 25 kHz for single signal input, the receiver sensitivity of -44 dBm, and the maximum frequency error is 75 kHz for 6 multi-tone input signals. These results indicate that the fabricated compressive receiver is working well even in dense RFID operating environments.

• Journal of the Institute of Electronics and Information Engineers
• /
• v.52 no.12
• /
• pp.67-73
• /
• 2015

This paper presents a fully integrated 3 - 5 GHz IR-UWB(impulse radio ultra-wide band) RFIC for Location based system. The receiver architecture adopts the energy detection method and for high speed sampling, the equivalent time sampling technique using the integrated DLL(delay locked loop) and 4 bit ADC. The digitally synthesized UWB impulse generator with low power consumption is also designed. The designed IR-UWB RFIC is implemented on $0.18{\mu}m$ CMOS technology. The receiver's sensitivity is -85.7 dBm and the current consumption of receiver and transmitter is 32 mA and 25.5 mA respectively at 1.8 V supply.

• Journal of the Microelectronics and Packaging Society
• /
• v.7 no.3
• /
• pp.19-25
• /
• 2000

In this paper, we describe RF receiver module for IMT-2000 handset with 5 MHz channel bandwidth. The fabricated RF receiver module consists of Low Noise Amplifier, RF SAW filter, Down-converter, If SAW filter, AGC and PLL Synthesizer. The NF and IIP3 of LNA is 0.8 dB, 3 dBm at 2.14 GHz, conversion gain of down-converter is 10 dB, dynamic range of AGC is 80 dB, and phase noise of PLL is -100 dBc at 100 kHz. The receiver sensitivity is -110 dBm, adjacent channel selectivity is 48 dBm.

• Proceedings of the Optical Society of Korea Conference
• /
• 2004.07a
• /
• pp.16-17
• /
• 2004

• Proceedings of the KSMRM Conference
• /
• 2003.10a
• /
• pp.16-16
• /
• 2003

Purpose： Recently, a major interesting method of fast MR imaging is sensitivity encoding (SENSE) using arrays of multiple receiver coils. In this study, we have designed and implemented a 4-channel head array coil and optimized the structure and arrangement of the coil to improve the performance.