A CMOS Switched Transconductor Mixer

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Klumperink, Eric A.M. and Louwsma, Simon M. and Wienk, Gerard J.M. and Nauta, Bram (2004) A CMOS Switched Transconductor Mixer. IEEE Journal of Solid-State Circuits, 39 (8). pp. 1231-1240. ISSN 0018-9200

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Abstract:A new CMOS active mixer topology can operate at low supply voltages by the use of switches exclusively connected to the supply voltages. Such switches require less voltage headroom and avoid gate-oxide reliability problems. Mixing is achieved by exploiting two transconductors with cross-coupled outputs, which are alternatingly activated by the switches. For ideal switching, the operation is equivalent to a conventional active mixer. This paper analyzes the performance of the switched transconductor mixer, in comparison with the conventional mixer, demonstrating competitive performance at a lower supply voltage. Moreover, the new mixer has a fundamental noise benefit, as noise produced by the switch-transistors and LO-port is common mode noise, which is rejected at the differential output. An experimental prototype with 12-dB conversion gain was designed and realized in standard 0.18-/spl mu/m CMOS to operate at only a 1-V supply. Experimental results show satisfactory mixer performance up to 4 GHz and confirm the fundamental noise benefit.
Item Type:Article
Copyright:© 2004 IEEE
Faculty:
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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Link to this item:http://purl.utwente.nl/publications/48800
Official URL:http://dx.doi.org/10.1109/JSSC.2004.831797
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