| 摘要 |
A mixer comprises an LO (Local Oscillator) switching circuit for switching in response to an LO signal, a driver amplifier driven in response to an RF signal, an IF generator for generating an IF signal by detecting a difference between the LO signal and the RF signal, a filter for detecting a nonlinear low frequency intermodulation component of the RF signal, a low frequency amplifier for amplifying the low frequency intermodulation component and inverting a phase of the low frequency intermodulation component and an intermodulation component feed-forwarding circuit for feed-forwarding the amplified low frequency intermodulation component to output terminals of the driver amplifier or the LO switching circuit whereby the low frequency intermodulation component can be removed. The mixer removes an intermodulation component of an input RF signal generated due to the nonlinear characteristic of an RF amplifier, thereby to improve the linearity of the mixer.
|
