Title :
Analysis of IC op-amp power-supply current sensing
Author :
Su, W.J. ; Lidgey, F.J. ; Porta, S. ; Zhu, Q.S.
Author_Institution :
Sch. of Eng., Oxford Brookes Univ., UK
fDate :
30 May-2 Jun 1994
Abstract :
The current characteristics in IC op-amp power-supply current sensing circuits are thoroughly investigated. It is shown that there exists non-ideal currents in op-amp power-supply leads which were formerly considered to be zero. These currents become very large at high frequencies and introduce the main source of errors in these circuits. The equations of the non-ideal currents are given in the paper and based on these, an improved op-amp power-supply current sensing circuit can be obtained
Keywords :
bipolar analogue integrated circuits; errors; linear network analysis; operational amplifiers; power electronics; IC op-amp; current characteristics; errors; high frequencies; nonideal currents; power-supply current sensing; Bandwidth; Current supplies; Equations; Frequency; Integrated circuit synthesis; Operational amplifiers; Power engineering and energy; Power supplies; VHF circuits; Voltage;
Conference_Titel :
Circuits and Systems, 1994. ISCAS '94., 1994 IEEE International Symposium on
Conference_Location :
London
Print_ISBN :
0-7803-1915-X
DOI :
10.1109/ISCAS.1994.409432
