.2.4 Ghz Receiver Chip In 0.35¦Ìm Bicmos Mixer Analysis And Design

In recent years, the wireless communication has developed diversely. Meanwhile, the wireless network has been used in enterprise, school, and family gradually, as long with people's increasing demands on the application of Internet and the mobile data exchange. So, the wireless high frequency communication has being developed. Presently, the manipulations are mainly focusing on two frequencies: the 2.4GHz ISM Band (Industrial, Scientific, and Medical Band), and the 5GHz U-NII Band (Unlicensed National Information Infrastructure Band). Because the two frequencies are free in charge and without certification, they can be used freely if the users observe the corresponding rules. Between these frequencies, the 2.4GHz ISM Band has been wildly used, due to that it is relatively easier to be realized in radio frequency (RF) front end. As the key technologies of RF IC still belong to the major foreign companies, it is crucial for Chinese IC industry to design and develop the IC chip independently.Because in the RF integrated circuit, the proper models of the devices are extremely important for the veracity of the design, this thesis firstly discusses the models of integrated passive devices, and the MOS RF model. Further more, according to the latest development in the noise models, the analysis of the low noise amplifier (LNA), taking both the thermal noise and the shot noise into consideration, is presented. It is helpful to predicate the noise performance of LNA more accurately.Second, the thesis introduces the fundamentals of the mixer, with some common structures as well as their merits and demerits are given out. Also, the thesis presents the detailed analysis of the CMOS commutating Gilbert Mixer, which is the most widely used currently. Especially, the tradeoff techniques are discussed. Based on the analysis, the common structure of the mixer is optimized according to the demands of the 2.4GHz ISM Band receiver project. For the first stage mixer, an optimal input matching network, and the carefully chosen sizes and bias of transistors are applied to improve the noise figure (NF). Also, with a resonant LC loop as the current source and a parallel PMOS-resistor as the load, the mixer has a high linearity. The post simulation results show that the single side-band noise figure of 8.57dB, conversion gain of 10dB, input 1-dB compression point (P_-1dB) of-7.84dBm, and input third-order intercept point (IIP3) of 4.52dBm are achieved. On the other hand, for the second stage mixer, a LC loop is used as the load to accomplish both the transformation of the output signal from differential to single end and the restriction on the noise. The post simulation shows that the single side-band noise figure of 11.63dB, conversion gain of 4.53dB, P_-1dB of-3.21 dBm, and IIP3 of 2.28dBm. Finally, the post simulation of the 2.4GHz RF front end which includes the LNA and the mixer shows that the single side-band noise figure of 5.84dB, conversion gain of 21.21dB, P_-1dB of-16.91dBm, and IIP3 of-5.63 dBm. All the devices are designed in Jazz 0.35μm BiCMOS process.