Patent ID: 7203466

Claim:
A transmitting and receiving unit, comprising: first and second frequency generators each having a separate phase-locked loop with a local oscillator frequency set independently by a divider ratio, said phase-locked loop of said first frequency generator outputting a first local oscillator frequency and said phase-locked loop of said second frequency generator outputting a second local oscillator frequency; a switch having switch positions including a first switch position and a second switch position; a receiving branch with an in-phase component and a quadrature component, said receiving branch having a first frequency converter coupled to said first frequency generator; a transmitting branch with an in-phase component and a quadrature component, said transmitting branch having a second frequency converter switchably coupled to one of said first and second frequency generators through said switch; a control device coupled to said switch for selecting a transmitting mode of operation and a receiving mode of operation; and a reference frequency source commonly connected to said first and second frequency generators; in the first switch position, said first frequency converter receiving the first local oscillator frequency and said second frequency converter receiving the second local oscillator frequency; in the second switch position, said first and second frequency converters receiving the first local oscillator frequency from said first frequency generator.