Patent ID: 11923878
Assignee: FUJITSU LIMITED
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 2:
3. The wireless signal processing circuit according to claim 1, wherein the plurality of mixers include:
a mixer that uses a normal phase signal of a first local signal to up-convert the frequency of the in-phase signal processed by the corresponding phase switcher and variable amplifier, the first local signal being a differential signal, and a mixer that uses an antiphase signal of the first local signal to up-convert the frequency of the in-phase signal processed by the corresponding phase switcher and variable amplifier;
a mixer that uses the normal phase signal of the first local signal to up-convert the frequency of the quadrature signal processed by the corresponding phase switcher and variable amplifier, and a mixer that uses the antiphase signal of the first local signal to up-convert the frequency of the quadrature signal processed by the corresponding phase switcher and variable amplifier;
a mixer that uses a normal phase signal of a second local signal to up-convert the frequency of the in-phase signal processed by the corresponding phase switcher and variable amplifier, the second local signal being a differential signal that is rotated 90° in phase relative to the first local signal, and a mixer that uses an antiphase signal of the second local signal to up-convert the frequency of the in-phase signal processed by the corresponding phase switcher and variable amplifier; and
a mixer that uses the normal phase signal of the second local signal to up-convert the frequency of the quadrature signal processed by the corresponding phase switcher and variable amplifier, and a mixer that uses the antiphase signal of the second local signal to up-convert the frequency of the quadrature signal processed by the corresponding phase switcher and variable amplifier.