Title :
A wide-band low-noise amplifier with double loop feedback
Author :
Martins, Miguel A. ; Van Hartingsveldt, Koen ; Verhoeven, Chris J M ; Fernandes, Jorge R.
Author_Institution :
I.S. Tecnico, INESC-ID Lisboa, Portugal
Abstract :
There is increasing interest in wireless receivers that can work with different standards at different frequencies. The usual way of implementing a low noise amplifier (LNA) block in such a receiver is to use separate narrowband LNAs. In this paper, a wideband LNA is presented, with negative feedback by means of a double loop feedback network to achieve simultaneously a low noise figure and input matched impedance for a wide range of frequencies. The designed LNA has a noise figure lower than 3 dB, input impedance matched to 50 Ω and a gain above 12 dB for a frequency range between 700 MHz; and 5 GHz. The LNA has been designed in 0.18 μm CMOS technology from National Semiconductor. It consumes 18.9 mW for a supply voltage of 1.8 V.
Keywords :
CMOS analogue integrated circuits; MMIC amplifiers; feedback amplifiers; impedance matching; wideband amplifiers; 0.18 micron; 1.8 V; 12 dB; 18.9 mW; 3 dB; 50 ohm; 700 MHz to 5 GHz; CMOS; LNA noise figure; double loop feedback; input matched impedance; low-noise amplifier; negative feedback; wide-band amplifier; wireless receivers; Broadband amplifiers; CMOS technology; Feedback loop; Frequency; Impedance matching; Low-noise amplifiers; Narrowband; Negative feedback; Noise figure; Semiconductor device noise;
Conference_Titel :
Circuits and Systems, 2005. ISCAS 2005. IEEE International Symposium on
Print_ISBN :
0-7803-8834-8
DOI :
10.1109/ISCAS.2005.1465845