Title :
Bipolar differential cell with improved bandwidth performance
Author :
Balsi, Marco ; Centurelli, Francesco ; Pennisi, Salvatore ; Trifiletti, Alessandro
Author_Institution :
Dipt. di Ingegneria Elettronica, Universita "La Sapienza", Roma, Italy
Abstract :
In this paper we present a novel technique to implement a differential cell with extended bandwidth. The solution exploits an auxiliary differential amplifier used in unity closed-loop gain, which regenerates the input signal, thereby allowing the reduction of the input capacitance of the main differential cell. Compared to a conventional topology with the same DC gain, the proposed one allows a maximum bandwidth improvement of a factor of two. Simulations using a SiGe bipolar technology in excellent agreement with expected results are also given.
Keywords :
Ge-Si alloys; bipolar analogue integrated circuits; capacitance; circuit simulation; differential amplifiers; integrated circuit design; integrated circuit modelling; network topology; semiconductor materials; DC gain; SiGe; SiGe bipolar technology; auxiliary differential amplifier; bandwidth performance; bipolar differential cell; cell topology; differential cell input capacitance; input signal regeneration; simulations; unity closed-loop gain; Bandwidth; Capacitance; Differential amplifiers; Feedback loop; Frequency; Negative feedback; Negative feedback loops; Optical amplifiers; Pulse amplifiers; Topology;
Conference_Titel :
Electronics, Circuits and Systems, 2002. 9th International Conference on
Print_ISBN :
0-7803-7596-3
DOI :
10.1109/ICECS.2002.1046432
