Title :
Buck-boost switched-capacitor DC-DC voltage regulator using delta-sigma control loop
Author :
Rao, A. ; McIntyre, William ; Parry, J. ; Moon, U. ; Temes, G.
Author_Institution :
Oregon State Univ., Corvallis, OR, USA
Abstract :
This paper presents a delta-sigma control loop for a buck-boost DC-DC converter with fractional gains. The charge pump used to convert the input voltage acts as a D/A converter in the loop, and its output ripple is frequency shaped by the loop, which also provides the pulse frequency modulation needed for the conversion. Simulation results show that the delta-sigma loop results in spreading the tones in the frequency domain. A suppression of up to 50 dB is observed in the 0-20 kHz range.
Keywords :
DC-DC power convertors; circuit simulation; delta-sigma modulation; pulse frequency modulation; switched capacitor networks; voltage control; voltage regulators; 0 Hz to 20 kHz; buck-boost switched-capacitor DC-DC voltage regulator; charge pump D/A converter action; delta-sigma control loop; frequency domain tone spreading; frequency shaped output ripple; input voltage conversion; pulse frequency modulation; simulation; Charge pumps; DC-DC power converters; Frequency conversion; Frequency domain analysis; Frequency modulation; Pulse modulation; Pulse shaping methods; Pulse width modulation converters; Regulators; Voltage control;
Conference_Titel :
Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on
Print_ISBN :
0-7803-7448-7
DOI :
10.1109/ISCAS.2002.1010564
