ACTIVE FILTERING FOR LOWER LOAD CAPACITANCE IN NOISE-SENSITIVE APPLICATIONS

摘要

Power architects engaged in designing systems requiring low output noise and fast transient response, such as RF transmitters, power amplifiers, test systems, displays and designs supporting low voltage ASICs and laser diode transmitters, understand that when attempting to tailor power systems to meet both requirements using passive components, the two objectives become diametrically opposed. Minimising periodic and random deviations (PARD) requires filtering, whereas fast transient response is impeded by filtering.rnThe characteristics of the DC-DC converter, the load, the electrical characteristics of the passive components and the available PCB area all present additional design constraints that further limit the designer's options.