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https://designers-guide.org/forum/YaBB.pl Design >> Analog Design >> confused about TIA's noise https://designers-guide.org/forum/YaBB.pl?num=1162521783 Message started by Robert on Nov 2nd, 2006, 6:42pm |
Title: confused about TIA's noise Post by Robert on Nov 2nd, 2006, 6:42pm in a simple shunt-shunt feedback structure Transimpedance Amplifier, like a single stage push-pull amplifier with a passive feedback resistor, shown as following: according the thermal noise analyse, to obtain low input rms noise current , i think it shoule maximize the resistor, and maximize L and minimize the W/L of the MOSFET to decrease gm and 1/f noise , but practically in my simulation and test, i found that it shoud maximize the resistor and W/L, and use minimum L. why the theory conflict with the fact? hope someone help me solve this problem, thanks! |
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