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Generating Biphasic Signal with OpAamp

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StillTrying:
The bottom op amp needs a DC path from its +ve input to 0V.

A.Ersoz:
Can you describe a little more your comment
--- Quote ---The bottom op amp needs a DC path from its +ve input to 0V.
--- End quote ---
?

A.Ersoz:
I have one more question. How can I make biphasic signal as sharp rising and falling edge? In my signal which is attached, there is a little ramp 0 to positive and positive to negative changing?

Here is my code:


--- Code: ---
// DAC Conversion
                // Output A of the DAC
                HAL_GPIO_WritePin(DAC_SYNC_GPIO_Port, DAC_SYNC_Pin, GPIO_PIN_RESET);
DACA_Buf = DAC_A_Write<<12 | testdata_out<<4;
HAL_SPI_Transmit(&hspi2,(uint8_t*)&DACA_Buf,16,100);
HAL_GPIO_WritePin(DAC_SYNC_GPIO_Port, DAC_SYNC_Pin, GPIO_PIN_SET);

                // Output B of the DAC
HAL_GPIO_WritePin(DAC_SYNC_GPIO_Port, DAC_SYNC_Pin, GPIO_PIN_RESET);
DACB_Buf =  DAC_B_Write<<12 | testdata_out<<4;
HAL_SPI_Transmit(&hspi2,(uint8_t*)&DACB_Buf,16,100);
HAL_GPIO_WritePin(DAC_SYNC_GPIO_Port, DAC_SYNC_Pin, GPIO_PIN_SET);

// Switch 1st for supplying square signals to the inverting input of the Opamp
HAL_GPIO_WritePin(SW_1st_GPIO_Port, SW_1st_Pin, GPIO_PIN_SET);
DWT_Delay_us(100);
HAL_GPIO_WritePin(SW_1st_GPIO_Port, SW_1st_Pin, GPIO_PIN_RESET);

// Switch 2nd for supplying square signals to the noninverting input of the Opamp
DWT_Delay_us(40);
HAL_GPIO_WritePin(SW_2nd_GPIO_Port, SW_2nd_Pin, GPIO_PIN_SET);
DWT_Delay_us(100);
HAL_GPIO_WritePin(SW_2nd_GPIO_Port, SW_2nd_Pin, GPIO_PIN_RESET);


--- End code ---

patrick1:
loading it, sir, would be my suggestion

A.Ersoz:
Actually, I didn't understand with 'loading it'? What do you mean that?

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