Title :
Linearly Tunable CMOS OTA With Constant Dynamic Range Using Source-Degenerated Current Mirrors
Author :
Barúqui, Fernando A P ; Petraglia, Antonio
Author_Institution :
Electron. Dept., Univ. Fed. do Rio de Janeiro
Abstract :
This brief introduces a new operational transconductance amplifier (OTA) that maintains the input voltage-swing constant during gm adjustments, enabled by employing current mirrors with source degeneration. The OTA presents a wide gm tuning range, which is linearly accomplished through a variable current source. The key design steps are illustrated through an example, and simulation results are included to validate the theory
Keywords :
CMOS analogue integrated circuits; current mirrors; operational amplifiers; CMOS integrated circuit; linearly tunable amplifier; operational transconductance amplifier; source-degenerated current mirror; Circuit optimization; Dynamic range; Filters; MOSFETs; Mirrors; Operational amplifiers; Resistors; Transconductance; Tuning; Voltage; Analog integrated circuits; CMOS integrated circuits; operational amplifier; transconductors; tunable amplifiers;
Journal_Title :
Circuits and Systems II: Express Briefs, IEEE Transactions on
DOI :
10.1109/TCSII.2006.881162
