US 2006/0135106 A1Published application

Active mixer with self-adaptive bias feedback

AssigneeRichWave Technology Corp.

InventorsChing-Kuo Wu, Chih-Wei Chen, Yun-Shan Chang, Shyh-Chyi Wong

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Abstract

An active mixer with self-adaptive bias feedback is described and resolves a poor linearity, inconvenient design of a bias circuit, and other defects of a conventional mixer. The dual self-feedback bias structure according to this invention is used. The active mixer with self-adaptive bias feedback has a power supply, an RF input match/drive unit, a local oscillator input match/drive unit, a mixer core unit, a self-adaptive twin bias circuit and an IF output match/buffer unit. This invention improves the linearity of a conventional mixer and does not affect other characteristics. There are fewer components in this invention; an area of the mixer is thus smaller. Further, this invention may improve temperature response, increase yield factor, and lower unit cost. The dual self-feedback bias structure is designed for further application to other semiconductor manufacturing processes, components, and microwave products.

Claims17

Dependent claims

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.

8 more elements

Dependencies are inferred from the claim text.