Development Of Millimeter Wave Broadband Transmitters

With the development of Mobile Internet and Internet of Things, the data traffic pakages will be rapid growth, and the terminal connection will be diversity at the same time. These trends put forward to the development of the mext mobile communication technology(5G). In order to achieve high data rate, Millimeter wave becomes a hotspot of core technology on 5G research, and the signal source of millimeter wave communication is the main testing equipment.Aimed at millimeter-wave broadband signal source applications, the work of this thesis is concentrated on the development of a millimeter-wave broadband transmitter with 18-40GHz working frequency,500MHz channel bandwidth, and-80-0dBm output power. Because of the wide RF frequency, the scheme of RF module adopts the section and 18-40GHz is devided into 18-26GHz and 26-40GHz to accomplish mixing, amplifying, filtering, etc. Then, transmitter system simulation model is built and the simulation model of link budget is achieved by using the simulation software ADS, including stray simulation, link gain budget and ACPR simulation. On the basis of the simulation, a prototype is developed. The experimental results show that for 16QAM,500Msps modulation signal, EVM of modulator module at 2.8GHz was 2.66%,1%more than baseband signal. EVM of the IF module at 7GHz is 3.39%, and the gain flatness within 500MHz at 7GHz of IF is less than 1dB. Considering the wide output frequency, the thesis takes 22GHz and 31 GHz as the examples to give the data of the system debugging. At 22GHz, OP1dB is 11.5dB and IP3 is 16.9 dBm. ACPR is-47.4dBc. The gain flatness within 500MHz is less than 1 dB and EVM is 1.7%. At 31GHz, OP1dB is 18.6dBm and IP3 is 23.9dBm. ACPR is-47.1dBc and-47.0dBc. In-band flatness within 500MHz is less than 1.5 dB, and EVM is 1.77%. These all meet the requirements of the design.