Analysis and implementation of a CMOS even harmonic mixer with current reuse for heterodyne/direct conversion receivers

• Published in: IEEE transactions on circuits and systems. I, Regular papers Vol. 52; no. 9; pp. 1741 - 1751
• Main Authors: Shuenn-Yuh Lee, Ming-Feng Huang, Kuo, C.J.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.09.2005; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Circuit topology; Current reuse; direct conversion receivers; Energy consumption; even harmonic mixer (EHM); Frequency conversion; Harmonic analysis; heterodyne receivers; Linearity; Mixers; Performance analysis; Performance gain; Power measurement; Radio frequency
• ISSN: 1549-8328; 1558-0806
• DOI: 10.1109/TCSI.2005.852487

This paper presents a novel topology for the even harmonic mixer (EHM). The proposed mixer employs a current reuse circuit in the RF input stage to improve its linearity, and uses the double frequency technique in the LO input stage to overcome the leakage and dc offset problems for heterodyne and direct conversion receivers, respectively. In addition, the proposed topology also has the advantages of low power consumption and high conversion gain. In order to demonstrate the benefits of the proposed mixer, theoretical analyses of linearity, conversion gain, and noise performance have been described in detail. The measured results reveal that the proposed mixer has a single-end conversion gain of 9.17 dB, third-order input intercept point (IIP/sub 3/) of -5.01 dBm, and IIP/sub 3//dc of -6.31 dB, under the supply voltage of 1.8 V, power consumption of 1.35 mW, and LO power of 5 dBm at 900 MHz.