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LT 1166 bias ic? john curl or?

205.160.208.165
Posted on March 31, 1999 at 04:01:57
abc


 
Has anyone used this part?

 

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Re: LT 1166 bias ic? john curl or?, posted on March 31, 1999 at 13:00:07
john curl


 
We tried the LT1166 a few years ago. We had trouble with high frequency distortion. We could NOT meet THX specs. Interesting design though.

 

Re: LT 1166 bias ic? john curl or?, posted on March 31, 1999 at 17:52:19
Jon Risch


 
John,

It was expensive and had the HF problem. I believe I know how they could get the HF dist. down, if they would bring out a set of pins for a bypass cap.

Jon Risch

 

Re: LT 1166 bias ic? john curl or?, posted on March 31, 1999 at 18:40:50
john curl


 
You should give LT a call and give them some free advice. ;-) I spent a fair amount of time with that chip. It would make multichannel adjustment of bias very easy. By-the-way, I'm trying the OPA2604 in this future Parasound preamp. Looks good to me.

 

Re: LT 1166 bias ic? john curl or?, posted on March 31, 1999 at 18:51:01
john curl


 
Abc, was it you who found my patent on the net? I would like to get a copy of it, as I lost the paperwork in the Oakland firestorm in 1991.

 

US04035737, posted on April 1, 1999 at 02:33:42
abc


 
Here it is.

 

Re: US04035737, posted on April 1, 1999 at 03:03:54
abc


 
error in url,try this.

 

Re: LT 1166 bias ic? john curl or?, posted on April 1, 1999 at 03:41:20
abc


 
Was the problem with the constant product generator or the input stage? I can see problems with the input stage.But if you don't use the input stage at all and bypass the constant product generator with a large film cap shouldn't that work? It would seem to me that if you used cross coupled diff ins driving complementary second voltage amps with the LT 1166 spreading the bias that the distortion from the unused input stage would not do anything.The second voltage amps running class "A" would provide the matched constant current sources the LT 1166 needs to see for best high frequency response.Or am I missing something here?

 

Re: LT 1166 bias ic? john curl or?, posted on April 1, 1999 at 12:21:28
john curl


 
Thanks abc, I really appreciate it. I found the related patents interesting as well. One patent used my preamp to amplify the individual strings of the musical instrument.

 

Re: OPA2604, posted on April 4, 1999 at 20:50:20
Jon Risch


 
John,

The OPA2604 likes to be run class A via a pulldown resistor/current source (I find a resistor off of a voltage reference actually works better than a FET or current diode), although the diffence is subtle.

Also, the OPA2604 makes an excellent DC servo chip, very low feedthrough compared to most. For budget applications, the AD712 is also an excellent servo IC.

Jon Risch

 

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