Title :
Tunable differential-input gallium arsenide transconductors
Author :
Haigh, D.G. ; Toumazou, Christofer
Author_Institution :
Univ. Coll., London, UK
Abstract :
Three architectures are proposed for differential input transconductors which make use of a recently proposed current mirror and which provide simple transconductance tuning by control of a differential-pair tail current. Measured results confirm the linearity of the current mirror and simulation is used to evaluate the transconductors. One architecture having a high degree of symmetry is advantageous from the points of view of low feedthrough of the control signal, good linearity, wide differential-mode bandwidth and high common-mode rejection ratio.
Keywords :
III-V semiconductors; active networks; differential amplifiers; field effect integrated circuits; gallium arsenide; linear integrated circuits; nonlinear network synthesis; tuning; GaAs; control signal; current mirror; differential input transconductors; differential-pair tail current; good linearity; high common-mode rejection ratio; low feedthrough; simulation; transconductance tuning; transconductor current control; voltage controlled current source; wide differential-mode bandwidth;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19910098
