Patent ID: 7555280
Filing Date: 2009-06-30
Classification: H03D,H04B

Abstract:
1. A method of frequency direct conversion in a mobile communication terminal, the method comprising: a radio frequency distributing step of distributing a radio frequency input signal into two signals having 180° phase differences from each other by coupling; a local signal distributing step of distributing a local signal provided from a local oscillator into two signals having the same phase, the local signal distributing step further comprising a step of suppressing amplitude noise of the local signal; a signal mixing step of mixing the distributed radio frequency signals with the distributed local signals; an amplifying step of amplifying each of the mixed signals; a frequency band filtering step of allowing a low frequency band signal from each of the amplified signals to pass through in order to produce filtered signals; and a cancelling and adding step of canceling out DC offsets included in the filtered signals and adding a wanted signal.