Patent ID: 7437131
Filing Date: 2008-10-14
Classification: H03D

Abstract:
1. An active mixer with self-adaptive bias feedback, comprising: a voltage supply supplying voltage required by the active mixer; an RF input match/drive unit receiving an RF input signal and matching/driving the RF input signal; a local oscillator input match/drive unit receiving a local oscillator input signal and matching and driving the local oscillator input signal; a mixer core unit receiving a signal output from the RF input match/drive unit and the local oscillator input match/drive unit, the mixer core unit dealing with a signal mixing algorithm; a self-adaptive twin bias circuit unit, the voltage supply supplying voltage to the self-adaptive twin bias circuit unit, the self-adaptive twin bias circuit unit outputting to the mixer core unit a constant bias with a compensation effect; and a IF output match/buffer unit receiving a signal from the mixer core unit and outputting an IF signal after carrying out the signal match/buffering; wherein the power supply supplies voltage required by the RF input match/drive unit, the local oscillator input match/drive unit, the mixer core unit, the self-adaptive twin bias circuit unit, and the IF output match/buffer unit; wherein the self-adaptive twin bias circuit unit is made of two linear bias circuits connected in parallel; and wherein after the voltage supply and the self-adaptive twin bias circuit unit supply the required voltage, the active mixer processes a mixing algorithm of the RF input signal and the local oscillator input signal and finally outputs the IF signal.