How to improve OP linearity ?

kevin

我覺得上述unit gain buffer的測試,把OPAMP的gain error 及non-linearity混在一起
測試了.所測到的值為gain error 不是non-linearity.要把Vout-vs-Vin的兩個左右端連成
, ~2 p# F4 F( q一直線後,再去記算Vout與此直線的誤差,才是non-linearity.
$ `; s; u' j! C" r通常feed back opamp都有gain error ,而non-linearity比gain error 小,
所以在選OPAMP的 open-loop gain 都選open-loop gain 較大,以降低gain error 及non-linearity.真正OPAMP 的non-linearity要從frequency domain 去測它的3rd harmonic distortion(指differential 架構).