Browsing by Author "Lin, Chun-Yi"

Now showing 1 - 7 of 7

A 24 GHz Low-power and High-gain Low-noise Amplifier Using 0.18 mu m CMOS Technology for FMCW Radar Applications
(2012)
Lin, Chun-Yi
;
Lin, Ming-Wei
;
Liang, Ching-Piao
;
Chung, Shyh-Jong
;
傳播研究所
In this paper, a low power and high gain low-noise amplifier (LNA) is presented for 24 GHz FMCW radar applications fabricated in a 0.18 mu m RF CMOS process. The proposed LNA is with the characteristics of the source inductive degeneration type, the current reuse technique, and the invariance of current density in CMOS process. The proposed LNA with a compact size has a gain of 18.95 dB and a noise figure of 5.8 dB, while consuming 11.3 mW. The measured input 1-dB compression point (IP1 dB) and an input third-order intercept point (IIP3) are -26 dBm and -16.5 dBm, respectively.
A Low-power Low-voltage Current-reused Voltage-controlled Oscillator with Amplitude-balanced Technique
(2017-01-01)
Lin, Chun-Yi
;
Lin, Yu-Kei
;
Rao, Pei-Zong
;
Tarng, Jenn-Hwen
;
Chung, Shyh-Jong
A current-reused voltage-controlled oscillator (CRVCO) with amplitude-balanced technique is presented. A cascode cross-coupled pair is adopted, which is used to improve the difference between the differential output amplitudes of CRVCO at a 1.3V supply voltage. The measured amplitude imbalance ratio is less than 0.15%. The measured phase noise is -114 dBc/Hz at 1 MHz offset when oscillation frequency is at 7.8 GHz, resulting in an FOM of -187 dBc/Hz.
An Active Triple Band-notched Filter With Improved Q-Factor For UWB System
(2011)
Lin, Chun-Yi
;
Li, Wei-Tsung
;
Liang, Ching-Piao
;
Chung, Shyh-Jong
;
電信工程研究所
In this paper, an active triple band-notched filter with improved quality factor (Q-factor) in 0.18-mu m CMOS technology are presented. Due to the FCC\'s stringent power-emission limitation at the transmitter, the received signal power in the UWB system is smaller than those in IEEE 802.11 a/b/g wireless local area network (WLAN), and the worldwide interoperability for microwave access (WiMAX). To avoid the interferences such as the WLAN and WiMAX signals in the UWB passband simultaneously, the proposed band-notched filter can be adopted to eliminate these interferences. Two techniques are introduced to enhance the ability of outband rejection. A cascode-grounded active inductor circuit topology is employed, which is composed of a feedback resistor to improve the quality factor (Q-factor) of the active band-notched filter. With an extra parallel capacitor, the rejection of notch band also is improved obviously. The measured 23/24/31 dB maximum rejections at 2.4/3.5/4.9 GHz while consuming a dc power of 13.5 mW at 1.8-V power supply.
An Ultra-low-voltage CMOS VCO Using Parallel Capacitor for Phase Noise Reduction
(2012)
Lin, Chun-Yi
;
Rao, Pei-Zong
;
Chiu, Hsen-Hung
;
Chung, Shyh-Jong
;
傳播研究所
In this work, a 7.92 GHz ultra-low-voltage LC-tank voltage controlled oscillator (VCO) is introduced. The proposed LC-tank VCO adopts a NMOS cross-coupled topology and additional parallel capacitors for low voltage operation and phase noise reduction. The measured phase noise at 600 KHz frequency offset is -98 dBc/Hz and at 1 MHz offset is -108 dBc/Hz, respectively. The proposed VCO achieves a figure-of-merit (FOM) value of -187 dBc/Hz, drawing 0.87 mW from a 0.62V supply. The proposed circuit topology is designed for ultra wide-band (UWB) applications and implemented in TSMC 0.18 mu M CMOS technology.
Analysis and Design of Triple-band Input Matching for CMOS Low-noise Amplifier
(2012)
Lin, Chun-Yi
;
Liang, Ching-Piao
;
Rao, Pei-Zong
;
Chung, Shyh-Jong
;
傳播研究所
This paper presents the analysis and design of a triple-band low-noise amplifier (LNA) fabricated in a 0.18 mu m CMOS process. The triple-band operation is achieved by adding a switch component in a dual-band input network of an LNA, so that it can function at 2.5, 3.5, and 5.2 GHz. The proposed method can effectively decrease the chip area as compared to conventional designs. In addition, based on the design procedures provided in this paper, the component values of the triple-band input network can be accurately calculated to reduce the complication of the circuit design.
Compact composite noise-reduction LNA for UWB WPAN and WBAN applications
(2018-05-23)
Lin, Chun-Yi
;
Liang, Ching-Piao
;
Tarng, Jenn-Hwan
;
Chung, Shyh-Jong
;
電信工程研究所
An ultra-wideband (UWB) low-noise amplifier (LNA) implemented using 180nm complementary metal-oxide-semiconductor technology is presented for wireless personal area network (WPAN) and wireless body area network (WBAN). Increasing the resistance of the substrate resistor R-B reduces the noise factor. When additional substrate resistors and a composite feedback topology are employed, the proposed LNA can achieve both a 1.4dB reduction of the noise figure (NF) and a 4dB enhancement in power gain (PG). Over the operating frequency range from 3.1 to 4.8GHz, the LNA achieves a maximum PG of 14.5dB, a minimum NF of 1.5dB, and an input return loss of <10dB. The measured current consumption is 3mA with a 1.5V supply voltage. The active chip area is 0.008mm(2). The proposed 3.1-4.8GHz LNA has a superior NF, smaller active area, and the lowest dc power consumption compared with devices reported in the literature.
Temperature-Insensitive Gyrator-based Active Inductor with the Complementary Technique and Its Applications
(2014)
Lin, Chun-Yi
;
Li, Wei-Tsung
;
Rao, Pei-Zong
;
Chung, Shyh-Jong
;
電信工程研究所
In this paper, a novel temperature-insensitive gyrator is proposed with a temperature-compensated technique. The proposed gyrator-based active inductor composed of two back-to-back transconductors with a complementary technique are realized in triple-well 0.18-mu m CMOS technology. The complementary circuit topology is adopted to decrease the variation caused by temperature effect on the tranceconductance of the gyrator. Based on the temperature-compensated gyrator, the measured resonate frequency variation of the proposed gyrator-based active LC-tank circuit topology is less than 1% from 8.72% when the temperature varies from -20 to +60 degree centigrade (C-0). The value of frequency variation percentage over per degree centigrade is simply 0.012 which presents a lowest frequency variation than the traditional gyrator topology.