Everybody is good, in a project involving two ADA4817 1 of two-stage amplifier circuit, the first level magnified 100 times, 30 times the second-level amplification, signal under test for + 1 mv, 1 KHZ - 2 MHZ is XuanBo signal, the following is a circuit:


Now encountered a problem: when I'm debugging R4=NC, from T1 input signal, C10 as NC, c 33 0.5 pF, c 33 is 1 k resistor, R29 for NC, C40 1 pF capacitor, C39 direct short circuit, C41 short circuit, R34 for NC,
Results in the output waveform of the signal quality is very good, no peaks, but the magnification has been changed, and the early stage of the set of two level 3000 times magnification does not conform to, everybody, please help have a look at the reasons, discuss to learn,