Minimizing Switching Regulator Residue in Linear Regulator Outputs (Linear Technology) - 8
| Authors | Jim Williams |
| Manufacturer | Linear Technology |
| Description | Application Note 101. Linear regulators are commonly employed to post-regulate switching regulator outputs. Benefits include improved stability, accuracy, transient response and lowered output impedance. Ideally, these performance gains would be accompanied by markedly reduced switching regulator generated ripple and spikes. In practice, all linear regulators encounter some difficulty with ripple and spikes, particularly as frequency rises. This publication explains the causes of linear regulators' dynamic limitations and presents board level techniques for improving ripple and spike rejection. A hardware based ripple/spike simulator is presented, enabling rapid breadboard testing under various conditions. Three appendices review ferrite beads, inductor based filters and probing practice for wideband, sub-millivolt signals. |
| Pages / Page | 12 / 8 — REFERENCES |
| File Format / Size | PDF / 358 Kb |
| Document Language | English |
REFERENCES
Text Version of Document
Application Note 101
REFERENCES
4. LT1763 Low Dropout Regulator Datasheet, Linear 1. Williams, Jim, “A Monolithic Switching Regulator with Technology Corporation 100µV Output Noise,” Linear Technology Corporation, Ap- 5. Hurlock, Les, “ABCs of Probes,” Tektronix Inc., 1990 plication Note 70, October 1997 (See Appendices B,C,D,H,I 6. McAbel, W.E., “Probe Measurements,” Tektronix Inc., and J) Concept Series, 1971 2. Williams, Jim, “Low Noise Varactor Biasing with Switch- 7. Morrison, Ralph, “Noise and Other Interfering Signals,” ing Regulators,” Linear Technology Corporation, Applica- John Wiley and Sons, 1992 tion Note 85, August 2000 (See pp 4-6 and Appendix C) 8. Morrison, Ralph, “Grounding and Shielding Techniques 3. Williams, Jim, “Component and Measurement Advances in Instrumentation,” Wiley-Interscience, 1986 Ensure 16-Bit Settling Time,” Linear Technology Corpora- tion, Application Note 74, July 1998 (See Appendix G) 9. Fair-Rite Corporation, “ Fair-Rite Soft Ferrites,” Fair-Rite Corporation, 1998 an101f AN101-8
REFERENCES
4. LT1763 Low Dropout Regulator Datasheet, Linear 1. Williams, Jim, “A Monolithic Switching Regulator with Technology Corporation 100µV Output Noise,” Linear Technology Corporation, Ap- 5. Hurlock, Les, “ABCs of Probes,” Tektronix Inc., 1990 plication Note 70, October 1997 (See Appendices B,C,D,H,I 6. McAbel, W.E., “Probe Measurements,” Tektronix Inc., and J) Concept Series, 1971 2. Williams, Jim, “Low Noise Varactor Biasing with Switch- 7. Morrison, Ralph, “Noise and Other Interfering Signals,” ing Regulators,” Linear Technology Corporation, Applica- John Wiley and Sons, 1992 tion Note 85, August 2000 (See pp 4-6 and Appendix C) 8. Morrison, Ralph, “Grounding and Shielding Techniques 3. Williams, Jim, “Component and Measurement Advances in Instrumentation,” Wiley-Interscience, 1986 Ensure 16-Bit Settling Time,” Linear Technology Corpora- tion, Application Note 74, July 1998 (See Appendix G) 9. Fair-Rite Corporation, “ Fair-Rite Soft Ferrites,” Fair-Rite Corporation, 1998 an101f AN101-8
