Title :
Programmable-gain amplifiers based on AC couplings for continuous reception
Author :
Jussila, Jarkko ; Halonen, Kari
Author_Institution :
Electron. Circuit Design Lab., Helsinki Univ. of Technol., Finland
Abstract :
A change in the programmable baseband gain during reception can abruptly alter the output DC level, which degrades signal quality. Programmable-gain amplifiers (PGA), which do not produce such transients, can be designed by utilizing AC couplings. Two such PGA topologies based on switched parallel transconductors and switched resistive voltage dividers are analyzed. The parasitic capacitances associated to the switched devices may produce small transients. The magnitude of the transients in the first PGA topology is analyzed.
Keywords :
amplifiers; coupled circuits; programmable circuits; switched networks; voltage dividers; AC couplings; continuous signal reception; output DC level; parasitic capacitances; programmable baseband gain; programmable-gain amplifiers; signal quality; switched devices; switched parallel transconductors; switched resistive voltage dividers; Baseband; Circuit topology; Coupling circuits; Degradation; Electronic circuits; Electronics packaging; Filters; Frequency; Multiaccess communication; Signal design;
Conference_Titel :
Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on
Print_ISBN :
0-7803-8251-X
DOI :
10.1109/ISCAS.2004.1328316
