Title :
A low distortion bipolar mixer for low voltage direct up-conversion and high IF systems
Author :
Behbahani, Farbod ; Fotowat, Ali ; Navid, Saeed ; Gaethke, Rainer ; Delurio, Micheal
Author_Institution :
Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA
fDate :
9/1/1997 12:00:00 AM
Abstract :
This paper describes the implementation of a low distortion mixer for direct up-conversion and high IF systems. A Gilbert cell with a low distortion transconductance constitutes the mixer core. A current feedback loop is used to linearize the transconductance stage, achieving an alternate channel leakage of -71 dBc with a power penalty of 15%. The mixer operates from 2.7 to 7.5 V of supply voltage and over a temperature range of -40 to 85°C. It provides -3 dBm output power while drawing 7.5 mW from a 3-V supply. The mixer is implemented in 1-μm BiCMOS for a global system for mobile communications (GSM) chip set
Keywords :
BiCMOS analogue integrated circuits; UHF integrated circuits; UHF mixers; cellular radio; circuit feedback; electric distortion; -40 to 85 degC; 1 micron; 2.7 to 7.5 V; 7.5 mW; BiCMOS; GSM; Gilbert cell; bipolar mixer; cellular phones; channel leakage; current feedback loop; distortion; high IF systems; low voltage direct up-conversion; output power; transconductance; Acoustic distortion; BiCMOS integrated circuits; Filters; Frequency; GSM; Linearity; Low voltage; Telephony; Transconductance; Transmitters;
Journal_Title :
Solid-State Circuits, IEEE Journal of
