公开(公告)号：EP1855378A1

公开(公告)日：2007-11-14

申请号：EP07107570.9

申请日：2007-05-04

Applicant: M/A-COM, INC.

Inventor： Carrez, Frederic

IPC: H03D7/16

CPC classification number: H03D7/161

Abstract: An apparatus for frequency down-converting a radio frequency (RF) signal to baseband and an apparatus for frequency up-converting a baseband signal to radio frequency (RF) in two steps using the two quadrature components of a single local oscillator. For the down converter (200), the RF signal is mixed with both components of the local oscillator signal (LO) in a sub-harmonic mixer (204) to produce an intermediate frequency (IF) output signal having a frequency component at twice the local oscillator frequency minus the RF frequency, i.e., (2xLO)-RF = IF. The IF signal is next split into two and supplied to a quadrature mixer (206) that mixes the IF signal with the I component of the same local oscillator signal and separately mixes the IF signal with the Q component of the same local oscillator signal to produce an output signal comprising an I component and a separate Q component at baseband. In the up-converter (600), the baseband signal is split into two parts in quadrature with each other and supplied to a quadrature mixer (601) that mixes the one component of the baseband signal with the I component of a local oscillator signal at frequency F LO and separately mixes the other baseband component with the Q component of the same local oscillator to produce an intermediate frequency signal centered at the local oscillator frequency and comprising two components, namely, an I component and a Q component. Next, the intemiediate frequency signal is mixed with both components of the same local oscillator signal in a sub-harmonic mixer (605) to produce a radio frequency output signal having a frequency component at three times the local oscillator frequency minus the baseband frequency.

Abstract translation: 一种用于将射频（RF）信号降频到基带的装置和用于使用单个本地振荡器的两个正交分量的两个步骤将基带信号频率上变频到射频（RF）的装置。 对于下变频器（200），RF信号与子谐波混频器（204）中的本地振荡器信号（LO）的两个分量混合，以产生具有两倍频率分量的中频（IF）输出信号 本地振荡器频率减去RF频率，即（2xLO）-RF = IF。 IF信号接下来分为两部分，并提供给正交混频器（206），该正交混频器将IF信号与相同本地振荡器信号的I分量进行混合，并将IF信号与相同本地振荡器信号的Q分量混合，产生 输出信号包括基带处的I分量和单独的Q分量。 在上变换器（600）中，基带信号被分成正交的两部分，并提供给正交混频器（601），该正交混频器将基带信号的一个分量与本地振荡器信号的I分量混合 频率F LO并且将另一个基带分量与同一本地振荡器的Q分量混合以产生以本地振荡器频率为中心的中频信号，并且包括两个分量，即I分量和Q分量。 接下来，在子谐波混合器（605）中将同步本征振荡器信号的两个分量混合在一起，以产生具有三倍于本地振荡器频率减去基带频率的频率分量的射频输出信号。