Title :
A Digitally Controlled Variable-gain Low-noise Amplifier with Strong Immunity to Interferers
Author :
Koutani, Masato ; Kawamura, Hiroshi ; Toyoyama, Shinji ; Iizuka, Kunihiko
Author_Institution :
Sharp Corp., Osaka
Abstract :
A variable-gain low-noise amplifier with capacitive step attenuators is presented. The gain is digitally controlled by current splitting technique of cascode transistors for linearity requirements. The fabricated LNA showed IIP3 increase of -1.1 to 3.5 dBm at gain of 25.8 to 21.2 dB, respectively, wide gain range of over 42.7 dB by capacitive attenuators, NF of 1.5 dB at 650 MHz, and power consumption of 15.4 mW with 2.9 V supply voltage using a 0.5-mum BiCMOS process.
Keywords :
BiCMOS digital integrated circuits; UHF amplifiers; UHF integrated circuits; attenuators; digital control; integrated circuit design; low noise amplifiers; BiCMOS process; capacitive step attenuators; cascode transistors; digitally controlled current splitting technique; digitally controlled variable-gain low-noise amplifier; fabricated VGLNA design; frequency 650 MHz; gain 25.8 dB to 21.2 dB; power 15.4 mW; power consumption; size 0.5 mum; voltage 2.9 V; Attenuators; Bandwidth; Circuit noise; Detectors; Digital control; Digital video broadcasting; Energy consumption; Linearity; Low-noise amplifiers; Noise measurement;
Conference_Titel :
Solid-State Circuits Conference, 2006. ASSCC 2006. IEEE Asian
Conference_Location :
Hangzhou
Print_ISBN :
0-7803-9734-7
Electronic_ISBN :
0-7803-97375-5
DOI :
10.1109/ASSCC.2006.357854
