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|18th August 2004, 05:18 AM||#1|
My buffer amp modular! Execllent prefomance!
It's a wonderful day that I have success in my first ever unity-gain buffer amplifier modular design and testing. I spend more then half a year to do research, circuit design, simulation, pcb design, etc. After a quick testing using AudioPrecision system two cascade (2322), I found it's preformance is very good. The modular has unmatch preformance in IMD,THD+N,niose, testing You know, in the CCIF standard IMD vs amplitude testing, when input signal over -43dBV, IMD products can not be measure by AP SYSTEM TWO(2322)!!! And got just around 0.0002% as CCIF IMD testing result when input signal level down to -50dBV!
For spectrum of THD residual testing @ 1KHz 0dBV input, all of the distortion products were lower then -120dB!!!
And output noise testing, when the input of buffer amp modular was connect to ground through a 50ohm resistor, the output noise just around 1.5uV!
DC offset, lower lower then 1mV! When input short to ground by a 50ohm resistor. And lower then 5mV,when input port connect to ground through a 100k resistor!
Haha~~~~~~~~~~~ I wanna show it to you guys, because I think I really done a good job! All of these were not simulation on pc, they are true! They are real testing result!!!!!!!!!
I think There are NONE commercial open-loop unity-gain buffer amp can reach this preformance! The following pictures will show you the testing result, the modular, and the evaluation board......
Result of spectrum of THD residual testing @ 1KHz 0dBV input
CCIF IMD vs amplitude testing
SMPTE IMD vs amplitude
THD+N vs frequency
The buffer amp modular
Close view and size of modular
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