Other Parts Discussed in Thread: TMDXIDDK379D
Hello,
I'm using the IDDK board to control a brushless motor (TMDXIDDK379D)
This board include the hardware to manage a Feedback Resolver.
So, with the DAC of the µC, a Sinus signal of 10KHz is generated (with 16 steps so at 160KHz).
Before goes to Resolver Excitation, the DAC signal is filtered on the board on macro M11.
The second part is a low filter of type "Sallen & Key" with a cut-off frequency of 20,3KHz.
But for the first part, I can't identify the structure. (with U1, C5, R4, C6, R9, R5, R6, R7, R8, C7, C8)
Is somebody Can help me to identify it and may be say me the Transfert function?
The aim for me is to adapt the static gain without change the Cut-off frequency. The current static gain is I think like a simple subtractor structure : 68K/(10K+5.1K) = 4.5
Thank.
