Well, this come down to the fundamental method which a linear or switch mode power supply works. Linear is always bulkier but quieter (in term of EMI), switching mode usually smaller with comparable power but always noisier (even with a lot of EMI solution build in) That's why 99%(0.1% reserve for something I haven't seen) home audio amplifier use linear power supply. Or maybe someone have experience implementing SMPS in audio amp can share some insight. Regards, Cheng-Wee
From: [email protected] [mailto:[email protected]]On Behalf Of Brian O'Connell Sent: Tuesday, June 17, 2003 6:45 AM To: [email protected]; '[email protected]' Subject: RE: Transverse Balance Limitations 68.310_On Hook I suppose a telecomm expert should answer this, but here is my (somewhat) educated guess. The loop response of some SMPS to line and/or load variations can result short-term variations in output Z. Also, some SMPS have wide-band converter noise during start-up, and during response to load changes. Linear sources have, for practical purposes, no line or load variations when operated within ratings; and very hi CMR. There are (3) loops, that probably operate at different frequencies, that would cause a poorly-designed SMPS to adversly affect network ports: primary-side control, power-factor control, and output control. my opinions only. luck, Brian -----Original Message----- From: Alex McNeil [ mailto:[email protected]] Sent: Tuesday, June 17, 2003 2:09 AM To: '[email protected]' Subject: Transverse Balance Limitations 68.310_On Hook Hi Group, Can you help here. I pass the above FCC Part 68 specification when my product uses a Linear Power Supply but fail when I use my alternate Switch Mode Power Supply. Why should this be? Kind Regards Alex
