Patent ID: 8483643
Filing Date: 2013-07-09
Classification: H03D

Abstract:
1. A harmonic rejection mixer that adjusts a waveform of an output signal by combining outputs of a plurality of mixers connected in parallel to a rear stage of a plurality of gm elements, the harmonic rejection mixer comprising, as the plurality of gm elements that convert a voltage signal to a current signal, an I-phase gm element, a Q-phase gm element, and a shared gm element shared by an I phase and Q phase, wherein: each output of the plurality of gm elements branches into a plurality; each of the plurality of mixers has a configuration in which a switching element is connected to a branch of one output among the plurality of gm elements; a switching element connected to a branch of an output of the I-phase gm element and the Q-phase gm element is controlled by a driving signal with a ratio of an on-period to one cycle of 50%; a switching element connected to a branch of an output of the shared gm element is controlled by a driving signal with a ratio of an on-period to one cycle of less than 50%; and a Q-phase output switching element is on in at least part of an off-period of an I-phase output switching element among a plurality of the switching elements connected to the shared gm element.