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ADXRS620 Questions

Hi, I just get another three question about the ADXRS620:

1. Based on the figure1  in the data sheet, may I conclude the drive axis utilize the trans-impedence circuit while the sense axis employ the charge amplifier circuit to sense the variation of the weak capacitive signal ?

2. How to understand the unexpected frequency signal around 4kHz in the figure21 (page 8, the noise spectral density) ?

3. If I want to set the circuit gain and bandwidth of the last stage by placing a resistant between the SUMJ and Rateout, what's the type of the circuit, it is inverting amplifier or noninverting amplifier, I guess it should be inverting amplifier, but the functional block diagram confuse me.


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