Patent ID: 6340883
Filing Date: 2002-01-22
Classification: G01R,H03D

Abstract:
A wide band IQ splitting apparatus comprising:a quadrature oscillator for generating a pair of quadrature signals, an analog IQ splitter including a mixer for mixing an analog input signal with the pair of quadrature signals for splitting the analog input signal into analog I and Q signals of which bandwidths are reduced to approximately half relative to that of the analog input signal before analog to digital conversion, an amplitude and phase adjuster for adjusting relative amplitude and relative phase of the pair of quadrature signals in order to adjust imbalance of the amplitude and the phase of the analog I and Q signals from the analog IQ splitter, a first analog to digital converter for converting the analog I signal of which the bandwidth is approximately the half bandwidth of the analog input signal into a digital I signal, a second analog to digital converter for converting the analog Q signal of which the bandwidth is approximately the half bandwidth of the analog input signal into a digital Q signal, and a processor for receiving the digital I and Q signals and for compensating imbalance of amplitude and phase between the digital I and Q signals by using compensation data.