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Old 30th January 2010, 10:29 PM   #1
diyAudio Member
Join Date: Apr 2007
Default No Feedback MC Amp

Here is a design for a no feedback MC amp with a gain of 15. It utilizes paralleled low noise JFETs in a diffamp configuration. I purposely avoided feedback, primarily because the feedback chain introduces resistor-based thermal noise. Also, for the small signal swings of tens of mV it's possible to get good linearity w/o feedback. Sim results look good, with distortion <-100 dB and a 0.4 nV/sqrt(Hz) noise floor. The circuit has been simulated over 0-75 Centrigrade and appears well behaved. I have not started running a parametric sensitivity test. Perhaps some one who has designed similar circuits could indicate which transistor parameters need to be swept.
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File Type: jpg noise_pdf.JPG (57.6 KB, 70 views)
File Type: jpg schematic.JPG (60.4 KB, 84 views)
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