High Performance Active Mixer Overcomes RF Transmitter Design Challenges

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  • Author: James Wong
Next generation cellular base sta-tion transmitter design imposes signifi-cant challenges for RF designers. These wireless systems have stringent requirements for trans-mission of a clean signal with a low noise floor and low intermodulation and harmonic distortion. It is particularly challenging, as higher ordermodulation is required while transmitting multiple carrier signals. Demand for mixer linearity performance is high. In the past, pas-sive diode-ring type mixers have been the evices of choice to meet these requirements. Today, a new generation of active mixers offers significant advantages that save cost, power, and space, while solving some of the difficult technical problems associated with high per-formance transmitter designs.