Abstract ▼ AI-Helper

This thesis presents threes kinds of circuits for IMT-2000 handset on 2GHz Band. The first one is a conventional receiver, the second one is a receiver integrated with an image reject mixer, and the last one is a proposed quadrature generator to generate accurate quadrature signals for Hartley image...

This thesis presents threes kinds of circuits for IMT-2000 handset on 2GHz Band. The first one is a conventional receiver, the second one is a receiver integrated with an image reject mixer, and the last one is a proposed quadrature generator to generate accurate quadrature signals for Hartley image reject architecture. The conventional 2GHz fully monolithic 0.5um SiGe BiCMOS superheterodyne receiver front-end is presented; it consists of two gain controllable low noise amplifiers and a single balanced mixer integrated in one die. The two gain controllable low noise amplifiers provide 4 stepped gain modes. The image reject receiver, consisting of a low noise amplifier and a Hartley image reject architecture, is also fully monolithic. The LO quadrature signals are generated by an injection locked frequency divider based on a 2 stage ring oscillator. And RC-CR networks are used for 90 deg. phase shifter. The simulation results show 54dB image rejection ratio. The proposed quadrature generator, using PLL conception and a tunable phase shifter, consume only 3.5mA more for phase control feedback loop. The simulation results show 0.12 deg. phase error at 2.3GHz. The expected image rejection ratio of the image reject mixer integrated with the quadrature generator is 60dB.

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