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A high linearity current mode mixer for IEEE 802.11 b/g/n/ax standard WLAN receivers is designed to meet the customized requirements of low cost and linearity for wireless LAN receivers. Adopting a zero intermediate frequency receiver architecture, the circuit structure of the current mode mixer mainly includes a transconductance stage amplifier, a mixing switch stage, and a transimpedance amplifier. By switching between two operating states of the transconductance stage and changing the feedback resistance of the transimpedance amplifier, the four level gain of the mixer can be adjusted. The mixing switch stage adopts a dual balanced passive mixing circuit to provide high linearity. In order to solve the DC offset problem in zero intermediate frequency receivers, a current injection DC offset calibration circuit has been added to further improve the linearity of the mixer. Optimize the design of the transconductance operational amplifier circuit in the transimpedance amplifier to increase its bandwidth, ensuring that the input impedance of the transimpedance amplifier is small enough to ensure the linearity of the mixer; Based on the 180 nm RF CMOS process, the mixer is simulated using Cadence software. When the local oscillator frequency is 2.4GHz, the four gain levels are 38dB, 32dB, 27dB, and 21dB, respectively. The intermediate frequency bandwidth can reach 20MHz; The noise figure is 8.46dB under high gain conditions, and the input third-order intermodulation point can reach 13.72dBm under low gain conditions; The simulation results show that the current mode mixer achieves good linearity performance under a wide intermediate frequency bandwidth, meeting the customization requirements of WLAN receivers.
Keywords: current mode mixer; linearity; transconductance amplifier; transimpedance amplifier; zero intermediate frequency receiver; DC offset calibration