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A fully differential low-voltage mixer topology is presented. The problem of stacking input-, cascode- and switching-transistors within 1.2 V supply voltage is solved by the use of a bulk driven mixer core. In order to demonstrate the feasibility a test chip was manufactured in INFINEON triple well 90 nm standard CMOS process. The differential mixer includes an on-chip resistive 50 Ω termination and an operational amplifier for measurements. The chip features a gain of 3.2 dB, a DSB noise figure of 17.4 dB, an input IP3 of -2.1 dBm, an input 1dB compression point of -13.3 dBm and consumes 1.8 mW at a power supply voltage of 1.2 V. The mixer has a 3 dB low-pass bandwidth of 20 GHz.
Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on (Volume:4 )
Date of Conference: 23-26 May 2004