A CMOS switched transconductor mixer
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TLDR
In this article, the performance of the switched transconductor mixer was compared with the conventional active mixer, demonstrating competitive performance at a lower supply voltage, and 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.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.read more
Citations
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References
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H. Darabi,Asad A. Abidi +1 more
TL;DR: In this paper, a qualitative physical model was developed to explain the mechanisms responsible for flicker noise in mixers, and simple equations were derived to estimate the flicker and white noise at the output of a switching active mixer.
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TL;DR: In this paper, a noise analysis of current-commutating CMOS mixers, such as the widely used CMOS Gilbert cell, is presented, where the contribution of all internal and external noise sources to the output noise is calculated.
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Intermodulation distortion in current-commutating CMOS mixers
M.T. Terrovitis,Robert G. Meyer +1 more
TL;DR: The nonlinearity behavior of CMOS current-switching mixers is investigated by treating the mixer as a periodically-time-varying weakly nonlinear circuit and the significance of a physical transistor model for reliable distortion simulation is demonstrated.
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A 2 V CMOS cellular transceiver front-end
TL;DR: In this paper, the authors present the design and implementation of a 2-V cellular transceiver front-end in a standard 0.25-/spl mu/m CMOS technology.