Inductorless linearization of low-power active mixers

A high linearity subthreshold mixer with negative impedance generation is presented. The mixer configuration was formed by adding two cross-coupling capacitors to a conventional structure. Since the internal negative impedance generation of this construction cancels parasitic capacitances, the conversion gain loss due to the parasitic capacitances is alleviated and the linearity is improved. Small-signal model calculations with Volterra series are presented to analyze the effects of cross-coupling capacitors on IIP3 and conversion gain, confirming that this design approach can improve the IIP3. The mixer was designed in 130nm CMOS technology and simulated with extracted layout parasitics. Having a power consumption of 0.373mW and a layout area of 0.0323mm2, it achieves more than 9dB conversion gain and 14dBm IIP3 from 2.4GHz to 11.4GHz.

[1]  Marvin Onabajo,et al.  IIP3 Enhancement of Subthreshold Active Mixers , 2013, IEEE Transactions on Circuits and Systems II: Express Briefs.

[2]  A.H.M. van Roermund,et al.  A low-voltage folded-switching mixer in 0.18-/spl mu/m CMOS , 2005, IEEE Journal of Solid-State Circuits.

[3]  Wei Cheng,et al.  A Flicker Noise/IM3 Cancellation Technique for Active Mixer Using Negative Impedance , 2013, IEEE Journal of Solid-State Circuits.

[4]  Arthur van Roermund,et al.  A low-voltage folded-switching mixer in 0.18-μm CMOS , 2005 .

[5]  Chunyu Xin,et al.  Radio frequency circuits for wireless receiver front-ends , 2005 .

[6]  Yann Deval,et al.  A 2.4GHz ultra-low power current-reuse bleeding mixer with resistive feedback , 2011, 2011 18th IEEE International Conference on Electronics, Circuits, and Systems.

[7]  Marvin Onabajo,et al.  Linearization of subthreshold low-noise amplifiers , 2013, 2013 IEEE International Symposium on Circuits and Systems (ISCAS2013).

[8]  Heng Zhang,et al.  A Noise Reduction and Linearity Improvement Technique for a Differential Cascode LNA , 2008, IEEE Journal of Solid-State Circuits.

[9]  N. Wongkomet,et al.  A $+$31.5 dBm CMOS RF Doherty Power Amplifier for Wireless Communications , 2006, IEEE Journal of Solid-State Circuits.

[10]  Hyuk Sun,et al.  A Low-Power and High-Gain Mixer for UWB Systems , 2008, IEEE Microwave and Wireless Components Letters.

[11]  Kiat Seng Yeo,et al.  A Weak-Inversion Low-Power Active Mixer for 2.4 GHz ISM Band Applications , 2009, IEEE Microwave and Wireless Components Letters.

[12]  A. Larky,et al.  Negative-Impedance Converters , 1957 .

[13]  Myoung-Gyun Kim,et al.  A Low-Voltage, Low-Power, and Low-Noise UWB Mixer Using Bulk-Injection and Switched Biasing Techniques , 2012, IEEE Transactions on Microwave Theory and Techniques.