Considerations for Replacing Conventional LVRs With Output Capacitor Free LVRs

Conference: PRIME 2012 - 8th Conference on Ph.D. Research in Microelectronics & Electronics
06/12/2012 - 06/15/2012 at Aachen, Germany

Proceedings: PRIME 2012

Pages: 4Language: englishTyp: PDF

Personal VDE Members are entitled to a 10% discount on this title

Jackum, Thomas; Pribyl, Wolfgang (Institute of Electronics, Graz University of Technology, 8010 Graz, Austria)
Maderbacher, Gerhard (Power Management Systems, Infineon Technologies Austria AG, 9500 Villach, Austria)

This paper discusses design considerations for replacing conventional linear voltage regulators (LVRs) for onchip loads with output capacitor free LVRs in CMOS. The key parameters for comparing the performance are chosen to be the output impedance and the power supply rejection ratio (PSRR). Based on the output impedance frequency response and PSRR frequency response the influence of external and internal components and parasitics will be shown. This allows an intuitive insight into the performance limitations of output capacitor free LVRs and gives a starting point for new designs. Keywords - LVR; LDO; capacitor less; output capacitor free