Title :
A CMOS wideband linear current attenuator with electronically variable gain
Author :
Wiegerink, Remco J.
Author_Institution :
MESA Res. Inst., Twente Univ., Enschede, Netherlands
Abstract :
A CMOS highly linear current attenuator is described. The circuit is suited for both differential and single input currents. The current gain is electronically variable between -1 and +1 by means of two controlling currents. A simple additional circuit is described to obtain a gain that is linearly dependent on a single control current. The circuit can be used as a four-quadrant current multiplier. The current attenuator is realized in a standard 2.5 μm CMOS process using channel lengths of 5 μm. The measured nonlinearity is less than 1% over the entire input current range. Simulations indicate a feasible -3dB bandwidth of over 100 MHz
Keywords :
CMOS analogue integrated circuits; analogue multipliers; attenuators; integrated circuit measurement; -3dB bandwidth; 2.5 micron; 5 micron; CMOS; channel lengths; current gain; differential input currents; electronically variable gain; four-quadrant current multiplier; nonlinearity; single input currents; wideband linear current attenuator; Attenuators; Bandwidth; CMOS process; Circuits; Electric variables control; Gain; Immune system; Mirrors; Voltage; Wideband;
Conference_Titel :
Circuits and Systems, 1993., ISCAS '93, 1993 IEEE International Symposium on
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-1281-3
DOI :
10.1109/ISCAS.1993.393883
