High linear transconductor for multiband CMOS receiver

This paper presents a transconductor for the wireless communication receiver applications. The operation range of the proposed transconductor can be used in Bluetooth, cdma2000, wideband CDMA, and IEEE 802.11a/g/b/n wireless LAN. By using floating transistor architecture in the input stage of transconductor, the proposed design can effectively enhance the THD performance. In addition, the MOS biased in the triode region combined with the current multiplier can achieve the voltage-to-current conversion. The wide tuning range of the proposed OTA can be obtained by a trans-linear loop, and the OTA operating in weak inversion region can significantly achieve a lower transconductance value. Simulation results show that the operation frequency can be up to 22MHz for the different wireless communication applications with 1.9mW power consumption in the TSMC 0.18μm process.