전류 재사용 기술을 사용한 저전력 초광대역 저잡음 증폭기

Abstract

In this thesis, two low-power ultra-wideband (UWB) low-noise amplifiers (LNAs) utilizing current-reused are presented. Two UWB LNAs have a high gain and wide bandwidth during the low-power condition. The first proposed UWB LNA is a low-power UWB LNA utilizing 3-stage current-reused with two common-gate (CG) amplifiers and a common-source (CS) amplifier. The first and second stage is designed the CG amplifier to obtain wide bandwidth input matching and low noise-figure (NF) at high frequency, respectively. And the CS amplifier with shunt and series inductive peaking technique was proposed at the third stage for a high power gain and wide bandwidth. In addition, the current-reused technique was offered to avoid extra power consumption. The proposed low-power UWB LNA obtained 3-dB bandwidth from 2.7 to 11.2 GHz, an average power gain of 18.58 dB, a minimum NF of 3.6 dB, and a total power dissipation of 4 mW from 1.4 V. A 0.18-um CMOS process is utilized for the fabrication. The second low-power UWB LNA is designed by using a CG amplifier and inverter CS amplifier with current-reused technique. The CG amplifier is employed at the first stage for a wide band input matching. At the second stage, an inverter CS amplifier with current-reused technique is utilized to obtain high power gain during the low-power condition. Besides, the splitting-load inductive peaking and series inductive peaking technique is employed as the second stage for a wide bandwidth. The proposed low-power UWB LNA have a maximum power gain of 13.57 dB, a minimum noise figure (NF) of 4.2 dB and a full band UWB bandwidth while consuming 3 mW from 1.5 V. The proposed is based on 0.18-um CMOS process.