Title :
A CMOS logarithmic IF amplifier with unbalanced source-coupled pairs
Author_Institution :
NEC Corp., Yokohama, Japan
fDate :
1/1/1993 12:00:00 AM
Abstract :
A CMOS logarithmic intermediate-frequency (IF) amplifier that is applied to mobile telecommunications equipment is presented. The CMOS logarithmic IF amplifier has pseudologarithmic rectifiers made from parallel-connecting full-wave rectifiers, consisting of unbalanced source-coupled pairs with the cross-coupled input stage and parallel-connected output stage. A ±3-dB logarithmic accuracy, a 90-dB input dynamic range, and a -30 to 80°C operating temperature range were achieved with the 1.3-μm double-polysilicon n-well CMOS process. Typical power consumption by the logarithmic IF amplifier in the fabricated CMOS LSI was 5.5 mW. The block area for the logarithmic IF amplifier was 0.8 mm2
Keywords :
CMOS integrated circuits; intermediate-frequency amplifiers; large scale integration; linear integrated circuits; mobile radio systems; radiofrequency amplifiers; -30 to 80 degC; 1.3 micron; 5.5 mW; CMOS LSI; Si; cross-coupled input stage; double-polysilicon; full-wave rectifiers; intermediate-frequency; logarithmic IF amplifier; mobile telecommunications equipment; n-well CMOS process; parallel-connected output stage; parallel-connecting; pseudologarithmic rectifiers; unbalanced source-coupled pairs; CMOS process; CMOS technology; Dynamic range; Energy consumption; Large scale integration; MOSFETs; Power amplifiers; Rectifiers; Signal processing; Telephony; Temperature distribution; Voltage;
Journal_Title :
Solid-State Circuits, IEEE Journal of
