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Old 11th April 2006, 07:50 PM   #1
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Default Texas Instruments licenses Pass patent

Press Release from Pass Laboratories, April 10, 2006:

Pass Labs is pleased to announce that Texas Instruments
has purchased a non-exclusive license to U.S. patent
# 5,376,899. The amplifier topology, marketed by Pass
under the tradename "SuperSymmetry" provides a means of
achieving high performance with balanced symmetric feedback
and minimal gain stages.

SuperSymmetry has been the basis for amplifiers marketed
by Pass since the 1998 introduction of the X-1000, a 1000
watt power amplifier using only two gain stages - differential
input transistors driving complementary power output transistors.

"The beauty of the design lies in the combination of power
and simplicity. We believe that the highest quality sound
is achieved with a simple gain path, and SuperSymmetry gives
us high performance with minimal complexity and negative
feedback", says inventor Nelson Pass.
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Old 11th April 2006, 07:52 PM   #2
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Any idea when real products will emerge?
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Old 11th April 2006, 08:04 PM   #3
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Old 11th April 2006, 08:07 PM   #4
Blues is offline Blues  United States
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Congratulations Nelson! Thinking about the numbers (as in $$$), is it mind numbing or simply .

You deserve it Mr. Pass, be the credit in monetary form or in words of praise.
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Old 11th April 2006, 08:33 PM   #5
Netlist is offline Netlist  Belgium
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Truly a milestone for a new generation of chip amps.
Congrats Nelson.

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Old 11th April 2006, 08:38 PM   #6
dimitri is offline dimitri  United States
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Very good, but you know, Nelson, this patent always looks suspicious to me...
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Old 11th April 2006, 08:40 PM   #7
dggs is offline dggs  United States
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Congratulations Mr. Pass!
Under the licensing agreement, can you still talk freely to the DIY world like before?
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Old 11th April 2006, 08:46 PM   #8
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Originally posted by dggs
Congratulations Mr. Pass!
Under the licensing agreement, can you still talk freely to the DIY world like before?
"non-exclusive license"

meaning nelson still owns the rights and is free to use it as he likes. of course, the legal meaning of "non-exclusive" and "license" may have recently been changed.

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Old 11th April 2006, 08:51 PM   #9
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Default Well deserved, NP!

Since I started the reverse engineering process (X100 thread), I believe I was probably the first to alert NP that SuperSymmetry was used in THS series balanced op-amps, at least according to the simplified datasheets. This must have been way back around the year 2001 or so.

So I got to brag a little there, but my point is that NP has been exceedingly gracious, helpful and motivational in his acceptance of our hobby efforts.

I am sure that he has gotten PR/Marketing benefits out of it. Now, he has gotten Intellectual Property revenue out of this, all the more power to him! My point is that NP would be unlikely to look at state of the art op-amps and thus less likely to find this patent breach unless he had been so open about his technology on this very forum.

Well done and well deserved. I hope you got a lot of money for it. It would also be nice to find out what plans TI had for this technology beyond op-amps like the THS4131 etc.

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Old 11th April 2006, 08:59 PM   #10
Bricolo is offline Bricolo  France
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Great news, congratulations!

I hope we'll be informed of the peoducts that uses SuSy
Just remember: in theory there's no difference between theory and practice. But in practice it usually is quite a bit difference... Bob Pease
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