The Research Of RF Low Voltage Gilbert Cell Mixer

In recent years, the development of telecommunication technology , we have sulfly the communication at any where and any time . Thus, people have great demand for high performance and big capacity telecommunication systems. According to this, the study on Radio Frequency and communication Integrated circuit (RFIC) became very popular. At the same time under the drastic market competition, communication systems requires the RFIC has low cost,low power consuming and multi-function. The development of RFIC techniques will follow the same way as the digital IC does, and CMOS technology will be implemented for RFIC finally .Mixer is one of the most implotment thing in communication systems.Firstly the basic operating principle the performance of mixer and some kinds of Mixer structure is introduced. Then we explain the conversion gain, double side noise figure, 1 dB compression of the mixer .Then A two port differ balanced mixer based on the Gilbert cell is designed as well as the local oscillate circuit. In order to design a 1voltage supply mixer, the LC oscillate circuit is design in the port of RF, also in the Gilbert cell constructed a folded configuration.Secondly this mixer was fabricated using the TSMC 0.18μm CMOS technology. The LO and RF Frequency is 2.5 GHz, and 2.45 GHz. Simulated with the ADS software. On the condition of low voltage and low power consumption, The described mixer has achieved a conversion gain of 10 dBm , double side noise figure of 40 dB , 1 dB compression point is -1 dBm , port to port Isolation is 60dBm , the total power consumption is 20mW .At last an applying circuit is design for another mixer pin, and machined with a high frequency PCB circuit .Tested with the Network Analyzer an expecting result is observed.