New Class-d design from Bruno,
https://www.monoandstereo.com/2019/02/new-lyngdorf-class-d-amplifier.html#more
Keith
https://www.monoandstereo.com/2019/02/new-lyngdorf-class-d-amplifier.html#more
Keith
OP was asking about PWM throughout not Class D. The input to Class D amplifier is analog, isn't it? In fully digital converters, it is
PCM -> PWM -> low pass filter -> analog output. The only such DAC+amp combo in existence that I am aware of is Sony's S-Master. Apparently, TI and Philips have/had such devices in the past?
New Class-d design from Bruno,
https://www.monoandstereo.com/2019/02/new-lyngdorf-class-d-amplifier.html#more
Keith
One problem which concerns me about D-amps, is that the damping factor is quite low at highest frequencies, but for bass frequencies no problem. When connected to speakers with varying loading impedance vs frequency (as with most speakers), the lower damping factor makes the frequency response not so flat any longer. Anyone seen a class D-amp with damping factor in the level of 100 (or output impedance of about 0,1 Ohms or less) at treble frequencies?
Cheers, /Per
One problem which concerns me about D-amps, is that the damping factor is quite low at highest frequencies, but for bass frequencies no problem. When connected to speakers with varying loading impedance vs frequency (as with most speakers), the lower damping factor makes the frequency response not so flat any longer. Anyone seen a class D-amp with damping factor in the level of 100 (or output impedance of about 0,1 Ohms or less) at treble frequencies?
Cheers, /Per
Yes it was in fact the ICEpower modules I was referring to. Thank you for the good news about those other brands. Also you HammerSandwich. Very nice figures! Thanks!The class D with rather high 20 khz output impedance are some of the ICEpower modules. I'm not sure if the latest versions fix that issue or not.
Yes I agree fully, about the output filters, but it appears have been solved now by the latest better amplifier makes. Very interesting and good news and if we get our hands on these modules, I think its hard to get any better. Maybe I will replace my Technics SE-M100 amplifier some day . Spec of it attached, and it appears that those latest Class D amps having as good specifications. Great!The bigger problem for class D amplifiers is usually the phase shift from the output filter rather than any impact of higher HF output impedance IME/IMO.
Yes I agree fully, about the output filters, but it appears have been solved now by the latest better amplifier makes. Very interesting and good news and if we get our hands on these modules, I think its hard to get any better. Maybe I will replace my Technics SE-M100 amplifier some day
Cheers!
Thanks Don for this comprehensive explanation.I'll take a stab at it but more learned engineers may correct my discussion.
OP was asking about PWM throughout not Class D. The input to Class D amplifier is analog, isn't it? In fully digital converters, it is
PCM -> PWM -> low pass filter -> analog output. The only such DAC+amp combo in existence that I am aware of is Sony's S-Master. Apparently, TI and Philips have/had such devices in the past?