The Key Technology Research For Current Driven Passive Mixer Based Wideband Receiver

The wireless communication market has grown fast in the past few years. Different kinds of wireless handsets are playing an important role in our lives. However, RF front-ends of different communication systems are not compatible with each other, resulting in lack of portable. This problem pushes designers to design an RF front-end which is capable to deal with multiple standards. Of all the sub-systems, Multi-mode multi-band receiver is difficult for designers. We will study on the core modules of the multi-mode multi-band receiver, and after that we will study on the integrated receiver.Low noise amplifier is the first stage of the receiver. It should achieve wideband input matching and low noise figure with power consumption as low as possible. We apply the current reuse and capacitor cross coupling techniques to reduce the power consumption to one fourth, and we use the resistor feedback topology to get the wideband input matching. After analyzing the impact of the feedback resistor on the parameters, we get an optimized resistance for the best noise figure and other parameters.Mixer is the second stage in the receiver which plays a key role in the down conversion. For the sake of linearity, the gain of the LNA shouldn’t be too large. Then the noise figure of the mixer should be as low as possible. After analyzing the noise contribution of the transconductance stage and the switch stage, we apply the noise cancellation technique and the current bleeding technique to reduce the noise. Since the ratio of the current bleeding has a direct affection on the gain and noise figure of mixer, we optimized this ratio to get the best performance.This thesis applies the current driven passive mixer to design the multi-mode multi-band receiver. We proposed a new way to raise the ac current ratio of mixer to LNA and we also proposed a new architecture to implement the transimpedance amplifier after analyzing the drawbacks of the traditional transimpedance amplifier. The new architecture consumes a lower power and meanwhile, the nose figure and stability are better than the traditional competitors. Our work is implemented with SMIC65nm process. The measured results demonstrate our design strategies.