| With the continuous development of communication technology,people’s demand for data transmission rate is increasing day by day.Because of its high transmission rate,high distance resolution and better security,UWB system has important application value in military and civilian fields.The smart antenna system,as well as the phased array system,can improve the output power of the transmitted signal due to its unique directional beamforming technology,and can generate nulls for side lobe signals,and has strong anti-interference.This technology will also have good application prospects in the future wireless communication field.As an important module of signal transmission in phased array system,uwb transmitter has important research significance and application value.Based on GF 0.13μm Si Ge Bi CMOS process,this paper completes the chip design and tape-out of ultra-wideband true time delay,attenuator,driver amplifier and power amplifier through in-depth research on ultra-wideband RF reconfigurable transmitter.According to the requirement of multi-function integration,a 2-18GHz ultra-wideband reconfigurable radio frequency transmitter system is constructed through the above circuit sub-modules.(1)Using ADS software to design the inductor with a smaller area and apply it to the delay unit of the delay device,thereby greatly reducing the overall chip area.(2)In order to compensate the attenuation of the passive module of the ultra-wideband true time delay device at high frequencies,a gain equalizer with an inductive negative feedback structure is designed,so that the gain of the true time delay device can be compensated at high frequencies.(3)The operating bandwidth and relative phase shift error of the attenuator are optimized by means of capacitance compensation.(4)The inductance peaking technology is adopted to improve the operating bandwidth and gain flatness of the drive amplifier and the power amplifier.This paper completes the circuit design,layout design and post-simulation of the ultra-wideband reconfigurable RF transmitter chip.The chip area is 1.4*4mm~2,and the overall power consumption is 425.5m W.The post-simulation results show that the designed ultra-wideband RF reconfigurable transmitter can achieve a delay time of 0～378ps,a delay step of 6ps,and a delay accuracy of 2～12ps in the working frequency band of 2-18GHz.S11 is less than-11d B,and S22 is less than-8d B.When the signal is 9GHz,the highest output gain is 21.3d B,the lowest is 18.4d B,and the single frequency gain fluctuation in the whole working frequency band is less than 3d B.The attenuator can realize the attenuation function of 0～30d B,the attenuation step of 10d B,the attenuation RMS amplitude error is less than4.5d B,and the maximum relative phase shift error is less than 12°.The output 1d B compression point is less than 3.46d Bm,which meets the needs of an integrated multi-functional ultra-wideband transmitter system. |
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