Patent ID: 11894867
Assignee: FUJITSU LIMITED
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 12:
13. A transmission device comprising:
a signal source configured to output a local signal with a first frequency;
a differential output circuit coupled to an output side of the signal source, and configured to generate, from the local signal, a differential signal that includes a first local signal and a second local signal obtained by inverting a phase of the first local signal and to output the differential signal;
a first amplifier provided with an output side of the differential output circuit, and configured to amplify the first local signal;
a second amplifier provided with an output side of the differential output circuit, and configured to amplify the second local signal;
a first mixer configured to mix a first input signal with an intermediate frequency and the first local signal amplified by the first amplifier and to output a first output signal;
a second mixer configured to mix a second input signal obtained by inverting a phase of the first input signal and the second local signal and to output a second output signal;
a third mixer configured to mix the first output signal output from the first mixer and the local signal and to output a third output signal;
a fourth mixer configured to mix the second output signal output from the second mixer and the local signal and to output a fourth output signal; and
an adder configured to add the third output signal output from the third mixer and the fourth output signal output from the fourth mixer.