Research And Design Of Inductorless Low Noise Amplifier And Phase Shifter In RF Front-end

With the scaling down of CMOS technology, it turns out to be a trend integrating multiple circuit blocks into a single chip to realize communication functions. RF front-end consists of Low-noise amplifier (LNA) and phase shifter, which are significant for wireless communication. LNA is the first stage of receiver module, whose noise performance determines the sensitivity of the receiver. Due to the widespread application of multi-band wireless communication standard and popularity of handheld devices, the design of LNA tends to have lower noise, broader band and lower power consumption. And the phase shifter, commonly used in radar transceiver components, provides high-accuracy amplitude and phase modulations for radar system.Based on CMOS technology, this thesis studies low noise amplifier module and phase shifter module and did the following work:1. This thesis presents an ultra-wideband, low power and low noise LNA using multiple trans-conductance enhancement technology and the positive feedback branch. Combine with active and passive trans-conductance enhancement technology to ensure matching and low-power consumption. By introducing positive feedback branch, the proposed LNA increases the freedom of trans-conductance, eases the constraint relationship between the input matching and noise coefficient, improves the trade-off relationship of noise and power consumption. This thesis based on SMIC 40nm technology, designs a LNA covers 0.1-6.5 GHz ultra-wideband, after attenuation of the output buffer, it achieves gain of 13dB and 3dB bandwidth reaches 4.4GHz. The noise coefficient of 3dB achieved optimal value at 1GHz, linearity is-15.59dBm, consumes 3.6mW@lV.2. Phase Shifter is the essential component of phased array radar. This thesis states the active phase shifter and passive phase shifter. For the active phase shifter, it is composed of attenuator, input balun I/Q network, VGA, output balun, power amplifier. I/Q network and VGA code design are mainly introduced in this thesis. The system design is under TSMC 180mm CMOS, which can achieve 5.625° steps covering 360° phase shifter in 1.9-2.6GHz working operating frequency. The root mean square error (rms error) of movement is under 0.9253°, the rms error of attenuation coefficient is not over 0.17dB. In addition, temperature compensation module is used to maintain characteristic in the different temperature.3. For the passive phase shift system design, the Bridge-T attenuator is chosen by comparing the different attenuator structures. It achieves the favorable input matching and high accuracy. For 6-bit phase shifter, it mainly focuses on 11.25°,22.5 ° and 45° simulation module and establishes the joint simulation of system layout. The simulation results show that the rms error of attenuation coefficient is not over 0.3356dB, the rms error of movement is under 3°. The temperature vatiantion has little influence on the stable phase shift system, which totally meets the need of the rms of 4-bit attenuation and 6-bit phase shifter.