Hi Andrews, We have tried all your suggestions, nothing seems to work. These are the observations: Input applied : 50mVpp, 70Hz Sinewave Case 1 for PGA gain: 1 In scope output : 100mVpp, 70Hz sinewave(shown below) In FFT tool (data was logged into excel) : for 70Hz magnitude obtained : -33.5dB(shown below) similarly.......... Case 2 for PGA gain: 2 In scope output : 200mVpp, 70Hz sinewave In FFT tool (data was logged into excel) : for 70Hz magnitude obtained : -21.5dB Case 3 for PGA gain: 4 In scope output : 400mVpp, 70Hz sinewave In FFT tool (data was logged into excel) : for 70Hz magnitude obtained : -9.4dB Please clarify the following query: The input to EVM at channel 2 is 50mVpp, 70Hz sine signal, with a PGA = 1 we get an ampification of 2(x2) i.e seen in the scope as 100mVpp, 70Hz sine signal but when it comes to FFT tab we see an attenuation of -33.5dB !!!!!!!!!!!!!!!!!! how is that possible. We are not understanding, how the magnitude for the FFT tool is being calculated, please give the method of calculation of magnitude for FFT, as soon as possible, is the FFT tool working?? we are having a deadline and for that, we need FFT analysis. We have provided all the required inputs as suggested by you(screenshots attached). please provide a solution, as early as possible
↧