Design ff CMOS Frequency Conversion Circuit For Receiver Front End

Abstract

In modern wireless communication systems, high level integration using CMOS technologies plays an important role for low cost performance. For mobile wireless communication systems, the low voltage and low power design issues are crucial due to the limitation of battery capacity. Therefore, the volume and weight of the transceivers can be further reduced using the low voltage and low power technique. As such, all the designs proposed here are realized with standard CMOS technology and they are suitable to be a building block in low voltage, low cost, compact size, high gain and low power receiver front end design owing to the superior performance. newline The most significant building blocks in the receiver front end are low noise amplifier (LNA), frequency down conversion circuit (mixer), local oscillator (LO) and intermediate frequency (IF) amplifier. Here, the main emphasis is given on design of the mixer, which is regarded as the main part of the receiver front end, as the total linearity of a system dependents on the linearity of the mixer. In CMOS transceivers, the Gilbert cell mixer is widely used as the down converter since they are broadband with good isolation, good conversion gain and high linearity, but with some drawbacks of high supply voltage and high power consumption. In this thesis, different integrated topologies are implemented to dissolve the trade-off problems in the mixer design. newline The design of LNA using resistive feedback gain enhanced noise canceling technique is carried out to achieve low noise and low power performance. The VCO design using dynamic threshold MOSFET (DTMOS), active resistor and gm-boosted techniques are focused to reduce the phase noise. Targeting at high gain, low noise performance, the combination of current bleeding with one resonating inductor and switched biasing method, current source helpers and current bleeding technique and bulk injection, current bleeding and switched biasing technique are implemented in the mixer design and achieved a conversion gain of 13.4 dB and nois