Harmonic rejection mixer arrangement

摘要

It is disclosed a mixer arrangement for complex signal mixing comprising a first harmonic rejection mixer, and a second harmonic rejection mixer. Each of the harmonic rejection mixers comprises mixer unit cells wherein each mixer unit cell comprises a differential input, transconductance elements corresponding to the differential input, and a switching network arranged to switch signals from the transconductance elements to a differential output, and the first and the second harmonic rejection mixers have mutual quadrature phase relationship. The first and the second rejection mixer share a plurality of mixer unit cell, each comprising an input for receiving a signal to be mixed, an input for receiving control signals derived from a local oscillator signal, and one output for each of the first and second harmonic rejection mixers. A radio circuit comprising such a mixer arrangement and a communication apparatus comprising such a radio circuit are also disclosed.

主权项

1. A mixer arrangement for complex signal mixing comprising:
a first harmonic rejection mixer; and a second harmonic rejection mixer, wherein each of the harmonic rejection mixers comprises a plurality of mixer unit cells wherein each mixer unit cell comprises a differential input, transconductance elements connected to the corresponding differential inputs, and a switching network arranged to switch signals from the transconductance elements to a differential output, the first and the second harmonic rejection mixers have mutual quadrature phase relationship, and the plurality of mixer unit cells includes a plurality of shared mixer unit cells that are shared by the first harmonic rejection mixer and the second harmonic rejection mixer, wherein each shared mixer unit cell comprises:
an input for receiving a signal to be mixed by the first and the second harmonic rejection mixers;an input for receiving control signals for controlling a respective shared mixer unit cell and derived from a local oscillator signal; andone output for each of the first and second harmonic rejection mixers, and wherein each of the plurality of shared mixer unit cells is arranged to also be operable in a high impedance state.