A capacitor cross-coupled common-gate low-noise amplifier

Abstract

Abstract-The conventional common-gate low-noise amplifier (CGLNA) exhibits a relatively high noise figure (NF) at low operating frequencies relative to the MOSFET , which has limited its adoption notwithstanding its superior linearity, input matching, and stability compared to the inductively degenerated common-source LNA (CSLNA). A capacitor cross-coupled -boosting scheme is described that improves the NF and retains the advantages of the CGLNA topology. The technique also enables a significant reduction in current consumption. A fully integrated capacitor cross-coupled CGLNA implemented in 180-nm CMOS validates the -boosting technique. It achieves a measured NF of 3.0 dB at 6.0 GHz and consumes only 3.6 mA from 1.8 V; the measured input-referred third-order intercept (IIP3) value is 11.4 dBm. The capacitor cross-coupled -boosted CGLNA is attractive for low-power fully integrated applications in fine-line CMOS technologies.Index Terms-Common-gate amplifier, low-noise amplifier (LNA), noise figure (NF), RF integrated circuits.

Design of a Low Power Capacitor Cross-Coupled Common-Gate Low Noise Amplifier

“…전류 재사용단의 공진을 위한 인 덕터의 크기를 줄이기 위하여 병렬 LC 회로를 사용 하였다 [4] . 있다 [1], [5] . 다음 절에 증폭기의 트랜스 컨덕턴스를 증 가시키는 방법에 대하여 설명되어 있다.…”

“…트랜스 컨덕턴스를 증가시키기 위한 한 방법으로 차동쌍 구조를 이용하는 캐패시터 크로스 커플링 방 법이 그림 3에 소개되었다 [1] . 반전 증폭값, A는 캐패 시터 전압 분배 법칙에 따라 …”

“…본 논문에서는 저전력 저잡음 증폭기 구현을 위 해, 캐패시터 크로스 커플링 방법을 이용하여 입력 정합을 함으로써 전류 소비를 줄였다 [1] . 또한 전류 재사용 방법을 사용하여 하나의 전류원으로 두 개의 증폭기를 작동시켜 회로 전체의 전력 소모를 최소화 하였다 [2], [3] .…”

A 2mW CMOS MICS-band BFSK transceiver with reconfigurable antenna interface

“…2b), the M 1 -M 2 devices are fixed current sources, while a capacitive cross-coupling path provides extra gain in the commongate (CG) devices M 3 -M 4 [6]. The half-circuit approximation of the LNA to analyze the gain and noise figure is shown in Fig.…”

RF building block modeling

“…Due to the strict demands on input matching, the transconductance ( ) for a common-gate (CG) LNA is fixed, resulting in difficulties in simultaneously providing NF<3dB and high gain [34][35][36][37][38][39]. The cross-coupled capacitors shown in Fig.…”