Công nghệ cơ khí hay kỹ thuật cơ khí là ngành ứng dụng các nguyên lý vật lý để tạo ra các loại máy móc và thiết bị hoặc các vật dụng hữu ích. Cơ khí áp dụng các nguyên lý nhiệt động lực học, định luật bảo toàn khối lượng và năng lượng để phân tích các hệ vật lý tĩnh và động, phục vụ cho công tác thiết kế trong các lĩnh vực như ô tô, máy bay và các phương tiện giao thông khác, các hệ thống gia nhiệt và làm lạnh, đồ dùng gia đình, máy. | 54 Advanced Microwave Circuits and Systems defined wireless standards 18 19 20 21 . The solution proposed in the Fig. 31 is based on a conventional heterodyne receiver with reconfigurable building blocks. But the adjusting of some functions like filters and antenna remains intricate and limits the covering of the receiver to a few of applications. The successful of SR implementation needs a new deal in radio schemes. Fig. 31. A software defined radio solution based on conventional radio scheme Other works on disruptive solution with an intensive research in analog Front End are proposed. Some explore discrete time analog signal processing in order to translate into analog domain the processing work usually done into digital 22 . It enables better trade-off between reconfigurability and power consumption. Among the most promising solution under study is the Sampled Analog Signal Processor SASP 23 fig. 32. The SASP uses the principle of an analog discrete Fourier transforms to translate into frequency domain the RF signal sasp7 . The calculation is based on voltage samples. Fig. 32. A software defined radio solution 23 Current reuse topology in UWB CMOS LNA 55 Once the spectrum containing the information in a 0 to 5GHz range is processed it is a matter to select the only one or several signal envelops to be demodulated. It is composed by few voltage samples among thousands. These samples are converted into digital for a digital signal processing. This system is able to cover any RF standards according to a low power consumption given by analog signal processing and flexibility offered by a DSP. The DSP manages the use of stored standards and reconfigures as needed the parameters of the SASP. The standard memory can be updated and accepts news standards through old standards Fig. 32. This brief on next SDR and SR solutions emphasizes the coming revolution in radio scheme of future wireless handsets. Hence the conventional solutions lying on super heterodyne receivers
