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Développement de cellules élémentaires radiofréquences faible consommation en technologie FDSOI pour des applications liées à l'internet des objets

Abstract : Wireless applications are almost by definition battery powered devices. Power consumption is therefore a major concern for the LNA design. There are always compromises to satisfy the low noise factor, reasonable gain, high linearity, low power and low cost.The objective of this work is to design a low noise amplifier LNA in 28 nm FDSOI technology provided by STMicroelectronics by implementing the design method of gm/ID and the RFPG (RF power gating) technique. The main part of this design is to achieve LNAs with very low power consumption without degrading performance.At first, the LNA design is based on the gm/ID methodology and the characteristics of the 28nm FDSOI technology. For such technologies, recent works show that good trade-offs between performances and consumption can be obtained in moderate or weak inversion region. In this work we present a complete method to size capacitive feedback LNAs. This topology is chosen for its compactness since only one inductor is used (in the input matching network). The presented design flow allows reaching some given performances (Noise Figure NF and voltage gain Glna) with the minimum power consumption while having a design constraint on the value of the inductor to better control the cost of the LNA. This low-power LNA conception is based on a gm/ID approach which is suitable for RF design in advanced technologies such as FDSOI. This method allows the sizing of all the components to reach a given NF and voltage gain while maximizing the gm/ID to minimize the power consumption. In addition, even if the linearity is not considered as a design constraint, this method leads to good IIP3 performances because it tends to reduce the input quality factor which causes high non-linearity. Moreover, this proposed method makes it possible to have a low input inductance value for adaptation. This inductance can also be replaced by bonding.In a second step, a LNA with the RFPG technique is presented. Based on a first LNA, a RFPG LNA is designated in very low consumption by turning on and off the LNA quickly. The principle of RFPG consists on power gating RF blocs such as LNA or Mixer during the symbol time. This approach is based on the observation that, in the case of a good propagation channel, it is not necessary to collect all the energy of the symbol. With this technique, it is possible to adapt the performance of the receiver to the quality of the channel and thus to adapt the power consumption.With the gm/ID method, the RFPG technique on advanced FDSOI technology, LNA consumption can be greatly reduced in keeping good performance.Mots-clés: Low noise amplifier; capacitive feedback; low power; gm/ID; RFPG (RF power gating); 28nm FDSOI
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Jing Liu. Développement de cellules élémentaires radiofréquences faible consommation en technologie FDSOI pour des applications liées à l'internet des objets. Micro et nanotechnologies/Microélectronique. Université Grenoble Alpes, 2019. Français. ⟨NNT : 2019GREAT057⟩. ⟨tel-02524863⟩

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