Mixer for Zigbee Front-end Transmitter

Abstract—This paper illustrates up-conversion mixer with very high linearity and improved conversion gain. CMOS Operational amplifier is used to enhance the overall conversion gain of the proposed mixer circuit. The derivative Superposition technique is applied to improve the linearity of the proposed Up-conversion mixer circuit. The operating frequency of this circuit is 2.4 GHz and it is applicable for the Zigbee transmitter front-end. In this proposed Up-conversion mixer, passive balun circuit is used to convert unbalanced base-band signal to differential balanced signal. The proposed up-conversion mixer converts input base band signal of 100 MHz to radio frequency output signal of 2.4GHz. The local oscillator frequency is 2.3 GHz and a local oscillator power is considered at 2 dBm. The conversion gain of this mixer is 18.86 dB, IIP3 and OIP3 are 15.9708 dBm and 16.4053 dBm respectively. The circuit is simulated on cadence analog and digital design tool at 45nm CMOS technology and rail to rail power supply is ±1.2 V