Multi-band reconfigurable complex mixer
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The reconfigurable complex mixer is considered as a core of the double–quadrature low-IF front-end with adaptive image rejection. The main property of this complex mixer is possibility to provide two modes of operation. In the first mode, the reconfigurable complex mixer achieves high image rejection. An increased power consumption is a consequence of providing high image rejection.When high image rejection is not necessary, the second mode with low image rejection is activated. Then, the power consumption is reduced compared to the mode with high image rejection.
In this chapter the design and implementation of the 1.9 – 2.4 GHz reconfigurable complex mixer is presented. The challenges in the design are to obtain high image rejection in the band 1.9 – 2.4 GHz and to minimize power consumption as well as the noise figure in the high image-reject mode. In order to evaluate the performance and costeffectiveness of this reconfigurable complex mixer a conventional 1.9 – 2.4 GHz complex mixer with high image rejection is designed and implemented too. Based on the comparison between experimental results, the advantages and disadvantages of the reconfigurable complex mixer are discussed.
KeywordsLoad Resistor Intermediate Frequency Complex Mixer Voltage Gain Switching Transistor
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