Hardware details.

Hello everybody!

Hello everybody!
During my absent here, I worked on power management system, LP filter and all schematics.
First of all I show You parameters of filter. As I wrote in previous post, my generator will be able to generate sine in following range: 0 - 10 000 Hz. So, filter has passband at 10kHz. More details connected with filter you can see below:

Name: Lowpass,
Multiple Feedback
Chebyshev 0,5 dB
Part: LMH6642MF OA
Order: 6   
Number Of Stages: 3
Gain: 1 V/V ( 0 dB)   
Allowable PassBand Ripple: 1 dB    
Passband Frequency: 10 kHz   
Corner Frequency Attenuation: 0 dB    
Stopband Attenuation: -45 dB    
Stopband Frequency: 18 kHz

The next important issue was checking how this filter works. In this order I used simulation program. Below you can see schematic of this filter and on the oscilloscope you can compare input and output signal.

As you can see filter works correctly - of course in simulation, but I expect that it will be worked correctly on my PCB.
This all about filter. Now I will show you schematics of following parts:
Power management system:

You can see that I obtained two different levels of voltage: 3.3V and 1.65V. This is caused by  operational amplifier which works in single supply mode.

Next picture contains schematic with processor STM32. This issue is  skipped  because this is standard solution for this processor.

 And last picture contains schemat of filter. I think that in this moment all about this topic is enough clear.

So, thank for your attention and you wait for next post.
In next post I will describe communication between generator and PC, I will show you human interface, which I have coded in C#.