I
icegray
- Jan 1, 1970
- 0
Hi,
I need to design sinewave generator or wave generator (3V to 50V
amplitute and 50Hz to 2KHz).
This is my design idea;
I create a wave by FPGA as PWM signal (10bit PWM resolution and 500KHz
PWM freq.) and adjust frequency. Then I can adjust voltage by changing
output voltage of Step-Up Regulators or Gain of Class D amp. And Class
D amplifier increase or decrease wave amplitude. All of system can
control with FPGA.
PWM Controlled Step-Up Reg (+3V to
+50V)
-----------------------------------------------------------------
|
--------------------------------------
Digital Wave (as PWM) ----- Class D Amp (Half Bridge) ------- LPF
----- Amplified Wave
--------------------------------------
|
---------------------------------------------------------------
PWM Controlled Step-Up Reg (-3V to
-50V)
I use LC low pass filter. I don't understand when calculating L and C
value Which frequency should i use for clear output signal?
What is your idea?
Thanks in Advance
I need to design sinewave generator or wave generator (3V to 50V
amplitute and 50Hz to 2KHz).
This is my design idea;
I create a wave by FPGA as PWM signal (10bit PWM resolution and 500KHz
PWM freq.) and adjust frequency. Then I can adjust voltage by changing
output voltage of Step-Up Regulators or Gain of Class D amp. And Class
D amplifier increase or decrease wave amplitude. All of system can
control with FPGA.
PWM Controlled Step-Up Reg (+3V to
+50V)
-----------------------------------------------------------------
|
--------------------------------------
Digital Wave (as PWM) ----- Class D Amp (Half Bridge) ------- LPF
----- Amplified Wave
--------------------------------------
|
---------------------------------------------------------------
PWM Controlled Step-Up Reg (-3V to
-50V)
I use LC low pass filter. I don't understand when calculating L and C
value Which frequency should i use for clear output signal?
What is your idea?
Thanks in Advance