gigle said:You can construc the square wave from sine wave. In this case you need infinite number of frequency components of sine wave, therefore the bandwidth of ideal square wave is infinity.
Many digital communication books are dealing with the concept of data rate and band width.
And also you can find the "Fourier series" in many mathmatic books or communication books.
see section 1.1 pg 3 of High-Speed Digital Designya i mean how to calculate it,got any formula or.....