Design of a novel mixer with high gain and linearity improvement for DRM/DAB applications

Author： Yiqiang Wu Zhigong Wang Jian Xu Jian Wang Ouli Zhang Lu Tang

ISSN： 1674-4926

Source： Journal of Semiconductors, Vol.34, Iss.1, 2013-01, pp. : 15005-15009

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Abstract

This paper focuses on a new design of a down-conversion mixer for a low-IF wideband receiver. Based on the folded structure and differential multiple gated transistor (DMGTR) technique, a novel quadrature mixer with a high conversion gain, a moderate linearity, and a moderate NF is proposed. The mixer is designed and implemented in a 0.18-μm CMOS process, and can operate in a frequency range from 150 kHz to 1.5 GHz. The circuit performance is confirmed by both simulation and measurement results. The measurement results exhibit a peak conversion gain of 13.35 dB, a high third order input referred intercept point of 14.85 dBm, and a moderate single side band noise figure of 10.67 dB. Moreover, the whole quadrature mixer core occupies a compact die area of 0.122 mm². It consumes a current of 3.96 mA (excluding the output buffers) under a single supply voltage of 1.8 V.