Title :
Current-mode approach for wide gain bandwidth product architecture
Author :
Lee, Chang-Hyeon ; Cornish, Jack ; Clellan, K. ; Chama, J.
Author_Institution :
Dept. of Electr. Eng.-Electrophys., Univ. of Southern California, Los Angeles, CA, USA
Abstract :
This paper describes the architectures of a fully differential input/single ended output, wide band, high gain current-mode comparator and amplifier. Both architectures employ a current conveyor (CCII) as the primary means of current-mode operation. The proposed comparator circuit has extremely high gain and wide bandwidth by employing cascode complementary gain stages and feedforward compensation techniques, respectively. The closed loop voltage amplifier, using the proposed current-mode techniques, can improve upon the gain-bandwidth-product when compared to conventional voltage-mode techniques. Computer simulation results show 135 dB of gain and 100 MHz bandwidth for such an amplifier
Keywords :
CMOS analogue integrated circuits; comparators (circuits); compensation; current conveyors; differential amplifiers; feedback amplifiers; feedforward; frequency response; wideband amplifiers; 0.8 micron; 100 MHz; 135 dB; CCII; CMOS process; cascode complementary gain stages; closed loop voltage amplifier; current conveyor; current-mode operation; feedforward compensation techniques; fully differential input; high gain current-mode amplifier; high gain current-mode comparator; single ended output; wide gain bandwidth product architecture; Bandwidth; CMOS technology; Circuits; Feedback loop; Frequency; Impedance; Lifting equipment; Signal processing; Voltage control; Wideband;
Conference_Titel :
Circuits and Systems, 1997. ISCAS '97., Proceedings of 1997 IEEE International Symposium on
Print_ISBN :
0-7803-3583-X
DOI :
10.1109/ISCAS.1997.608679
