I think that's a problem of IR, not yours.
Normally, the license costs are included in the price of the IC.
I know it from MP3-Decoder-DSPs, the license for use of mp3 is included.
Not, of course. UCD: phaseshift self-oscillating, with single feedback after filter.
But IRS2092 is an IC, not an amplifier. You can configure it to be the part of an UCD.
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"so practicaly, every class d amp that has a feedback after the filter and its selfoscilating is a UCD amp"
-> I dont really think so, coz the UCD patent exactly describes the RC feedback circuitry on comparator input to obtain controlled selfoscillation.
quote:
"the control circuit comprises a first element in the form of a resistor, for controlling said gain and a second element, in the form of a capacitance in series with a resistor, for controlling said alternately switching"
I have invented a different self-oszillation post filter feedback topology. The "second element" is not part of it, at least not in this form. So thats why I claim that my circuit is not UCD covered.
http://www.diyaudio.com/forums/clas...scillating-post-filter-feedback-topology.html
Also, the feedback transfer function H(s) described in the patent is different in my case as a consequence.
This topology is not "rocket-science", and it has the drawback of the additional air coil, but it can be optimized to work well over a wide load impedance / phase range. I m currently working to realize this as a full bridge with 175V bus....
-> I dont really think so, coz the UCD patent exactly describes the RC feedback circuitry on comparator input to obtain controlled selfoscillation.
quote:
"the control circuit comprises a first element in the form of a resistor, for controlling said gain and a second element, in the form of a capacitance in series with a resistor, for controlling said alternately switching"
I have invented a different self-oszillation post filter feedback topology. The "second element" is not part of it, at least not in this form. So thats why I claim that my circuit is not UCD covered.
http://www.diyaudio.com/forums/clas...scillating-post-filter-feedback-topology.html
Also, the feedback transfer function H(s) described in the patent is different in my case as a consequence.
This topology is not "rocket-science", and it has the drawback of the additional air coil, but it can be optimized to work well over a wide load impedance / phase range. I m currently working to realize this as a full bridge with 175V bus....
This is just the 3rd claim (wich is only the subclaim of the 2nd), but if a circuit meets any of the claims, then it is covered by the patent.
It's useless to alternate the feedback network, the 1st claim still covers it.
Sorry!
espacenet — Claims
@Pafi:
I see your point, think I need to check this into more detail but for today i m too tired....
Just assume, u re right, then why is there so much talking of the specific RC-circuit and its transfer function within US 7113038 B2 ? Is this patent valid for Europe also (hope not)? and how come one guy can get such a general patent? Doesn't it look like, for example, Bill Gates or another guy suddenly claiming patent for ALL operating systems..
I see your point, think I need to check this into more detail but for today i m too tired....
Just assume, u re right, then why is there so much talking of the specific RC-circuit and its transfer function within US 7113038 B2 ? Is this patent valid for Europe also (hope not)? and how come one guy can get such a general patent? Doesn't it look like, for example, Bill Gates or another guy suddenly claiming patent for ALL operating systems..
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