Title :
The sense amplifier common mode effect on a switching current-mode power staged based on sigma-delta modulation
Author :
Dallago, Enrico ; Quaglia, Fabio ; Venchi, Giuseppe
Author_Institution :
Power Electron. Lab., Pavia Univ., Italy
Abstract :
In this paper the behaviour of a sigma-delta current loop in a switching power stage is examined by focusing on its current sensing characteristics. In particular the influence of the current sensing common mode gain on system behaviour has been analyzed. The system was tested by applying it to a hard disk voice coil motor. The system works well in this application as the current sensing specifications it has to comply with are less stringent than alternative solutions.
Keywords :
CMOS memory circuits; driver circuits; hard discs; motor drives; sigma-delta modulation; Sigma-Delta current loop; Sigma-Delta modulation; common mode effect; common mode gain; current sensing characteristics; hard disk voice coil motor; sense amplifier; switching current-mode power; switching power stage; system behaviour; Bridge circuits; Clocks; Delta-sigma modulation; Frequency; Hard disks; Power amplifiers; Power electronics; System testing; Topology; Voltage;
Conference_Titel :
Solid-State Circuits Conference, 2003. ESSCIRC '03. Proceedings of the 29th European
Conference_Location :
Estoril, Portugal
Print_ISBN :
0-7803-7995-0
DOI :
10.1109/ESSCIRC.2003.1257212
