Patent ID: 6115584
Filing Date: 2000-09-05
Classification: H03D,H04B

Abstract:
A transmitter-receiver comprising:a transmitting circuit for providing an output by converting frequency of a transmission signal input thereto;a local oscillator for generating an oscillation signal having local oscillating frequency based on a reference signal;a local oscillator signal splitter connected to said local oscillator and splitting the oscillation signal into substantially similar transmit and receive oscillation signals each at the local oscillating frequency, the local oscillator signal splitter supplying the transmit oscillation signal to said transmitting circuit;a receiving circuit for providing an output by converting a frequency of a received signal input thereto, the local oscillator signal splitter supplying the receive oscillation signal to said receiving circuit, said receiving circuit comprising:a receiving input port for supplying the received signal to said receiving circuit;an image reject mixer in electrical communication with said input port, said image reject mixer combining said received signal and said receive oscillation signal to produce first and second intermediate frequency receive signals;a hybrid in electrical communication with said image reject mixer and receiving said first and second intermediate frequency receive signals, said hybrid combining said first and second intermediate frequency receive signals to produce an output received signal devoid of undesired image frequency components; anda reception output port connected to said hybrid for delivering said output received signal externally of said transmitting circuit;said transmitting circuit converting the frequency of the transmission signal in accordance with said transmit oscillation signal, and said receiving circuit converting the frequency of the received signal in accordance with said receive oscillation signal.