frequency range of ADA HSMC daughter board for Cyclone III FPGA

[Altera_Forum]

Dear everyone, 

 I am Peipei, I am using HSMC ADA daughter board with Cyclone III FPGA. I have generated a range of frequencies from 1KHz to 2MHz from the HSMC board via Cyclone III FPGA board (using VHDL). But I cannot receive good results of low frequencies at all. When I double check the schematic diagram of this daughterboard, I surprisedly found there are transformers connected to ADCs and DACs. So may I assert that the AD/DA board used as a high-pass filter? If it is, it will be a horrible news for me due to I need generate a range of low frequencies. But IS THERE ALTERNATIVE WAY that I can deal with it? Say, is there similar daughterboard I can use and without work as high-pass filter? Or how can I manually change the board?    According to the example .exe program the company offered in the example folder, it does shows the feature is bad performance of low frequencies.   I am really looking forward to hear from you.   Thank you very much.   Best wishes,   peipei

[Altera_Forum]

If it's the Terasic board, It's a a pretty high performance adc/dac on board. They are using the transformers to go from differential to single ended. 

 There are several ADC/DAC boards out there. The DAC has a transformer bypass stuff option, you may want to try that.  Pete