Title :
A low-noise amplifier with automatic gain control and anticlipping control in CMOS technology
Author :
Hauptmann, Jörg ; Dielacher, Franz ; Steiner, Reinhard ; Enz, Christian C. ; Krummenacher, Francois
Author_Institution :
Siemens-Entwick-lungszentrum fuer Mikroelektronik, Villach, Austria
fDate :
7/1/1992 12:00:00 AM
Abstract :
A CMOS low-noise amplifier (LNA) with two variable gain ranges of 6 and 9 dB is presented. Variable gain is realized by using linearized MOS resistive circuits (MRCs) as voltage-controlled resistors. One of these resistors is located in the feedback loop of a transresistance output stage and the other is in the bias current generator of the transconductance input stage. Using compatible lateral bipolar transistors (CLBTs) in the fully differential transconductance input stage, the circuit takes advantage of the linear dependence of transconductance on bias current. The equivalent noise is 14 nV/ square root Hz and free from 1/f noise in the voice band. The circuit was integrated in a 2- mu m CMOS process and has an active area of 0.8 mm2.
Keywords :
CMOS integrated circuits; audio-frequency amplifiers; automatic gain control; voice equipment; 2 micron; 6 to 9 dB; CMOS technology; active area; anticlipping control; automatic gain control; bias current; bias current generator; compatible lateral bipolar transistors; equivalent noise; feedback loop; linear dependence; linearized MOS resistive circuits; low-noise amplifier; transresistance output stage; variable gain ranges; voice band; voltage-controlled resistors; Automatic control; Bipolar transistors; CMOS technology; Circuits; Feedback loop; Gain control; Low-noise amplifiers; Resistors; Transconductance; Voltage;
Journal_Title :
Solid-State Circuits, IEEE Journal of
