Key Technologies Research On Co-design For Integrated Radio Frequency Receiver Front-end

Wireless communication plays a very important role in modern life. With the rapid development of civil communications market, the requirements of high-performance wireless devices have been increasing. RF front-end is the key part of the wireless communication; therefore, its ability to achieve miniaturization, high performance and low power is always the focus of design. Considering multiple components in RF front-end together, co-design can reduce the device number, thereby reduce system size, weight and price. By integrating the functions of the circuit, co-design can improve the device configuration and utilization, reducing the loss and power consumption caused by matching circuits. This thesis studies some key technologies in RF receiver front-end co-design, including the port characteristics at interfaces between antennas, band-pass filters (BPF) and low noise amplifier (LNA), and the function integration of these components. The main research contents are as follows:A coupled stepped impedance resonator (SIR) BPF is proposed, and its transmission line model is established. After the analysis, the relationship between the structure and the port parameters is obtained. According to the impedance matching principle, the method of determining each structure parameter is given. Also, practical BPFs are fabricated and measured, and the results validate the effectiveness of the method;A miniaturized SIR dual-band antenna is proposed. Two transmission line models are established and used to obtain the relationships between the operation frequencies (or input impedance) and the antenna structure parameters. Also, a miniaturized dual-band antenna example is designed and measured to verify the feasibility of the method;The basic co-design idea of dual-band LNA and input/output dual-band BPF is proposed, the co-design method for the two components is analyzed, and the design theory is given. A design example of 1.57/2.4 GHz dual-band BPF+LNA+BPF is used to verify the co-design theory. In addition, a circuit suitable for LTCC technology is proposed. The results indicate that co-design can reduce the number of devices in circuit in case of implementing the same performance as the traditional design, and result in miniaturization, high integration, low power consumption and low price.Based on the network theory, the calibration problem of symmetric device with arbitrary test fixture is analyzed. A calibration method is proposed, it can calibrate an arbitrary test fixture for a symmetric device by three measurements, and its validity is analytically proved. By measuring two standards and the DUT, the method can determine the characteristics of the test fixture and DUT simultaneously. The method can also apply to the one-port device. Furthermore, the validity of method is verified by the practical measurement. The results show that under the condition of reducing one measurement, the presented method can achieve the same accuracy as the thru-reflect-line method. Also, it is studied to obtaining the actual S-parameter of transistor by measurement and calibration. With the actual S-parameter of transistor, a better design results can be obtained.