A New Linearization Technique for CMOS RF Mixer Using Third-Order Transconductance Cancellation

Dept. of Electr. Eng., Nat. Central Univ., Jhongli
IEEE Microwave and Wireless Components Letters (Impact Factor: 1.7). 06/2008; 18(5):350 - 352. DOI: 10.1109/LMWC.2008.922129
Source: IEEE Xplore


A new third-order transconductance (gm3) cancellation technique is proposed and applied to a conventional radio frequency (RF) mixer for improving circuit linearity. The bulk-to- source voltage is applied to adjust the peak value position of gms. The cancellation of gm3 is utilized by a negative peak gm3 transistor combined in parallel with a positive peak gm3 transistor. For a single device, the measured adjacent channel power ratio (ACPR) and third-order intermodulation (IMD3) distortion are both improved over 15 dB. A Gilbert-cell mixer in commercial 0.18-mum CMOS process was designed using the proposed method to further evaluate the linearity. The compensated gm3 device is placed in the input RF gm-stage and then reducing the principle nonlinearity source of the mixer. From the experiment results, the ACPR and IMD3 of the mixer are improved about 10 and 15 dB, respectively.

Download full-text


Available from: Hong-Yeh Chang, Nov 14, 2013
  • Source
    • "Passive baluns have advantages of consuming no dc power. However, they are often using many spiral inductors and microstrip line which are lossy and expansive for large physical size [8]. Therefore, active baluns are the best choice due to the characteristics of more acceptable gain imbalance and phase imbalance and occupy a small area in integrated circuit designs [11]. "
    [Show abstract] [Hide abstract]
    ABSTRACT: This paper presents a high linearity and low power up-conversion mixer at 5.2 GHz for wireless applications. The design based on Gilbert-cell active double-balanced mixer with integrated on-chip input active balun. Core mixer employs additional parallel capacitors and the degeneration inductors to obtain high linearity. A designed active balun which converts single-ended input to differential signals for 100 MHz intermediate frequency (IF) is proposed. The up-conversion mixer converts an input of 100 MHz IF signal to an output of 5.2 GHz radio frequency (RF) signal with a local oscillator (LO) frequency of 5.1 GHz. The simulation results indicated that the proposed method shows the conversion gain of 6-dB, the input third order intercept point (IIP3) of 8-Bm, and 2.48-mW power consumption at 1.8-V power supply. © 2011 IEEE.
    2011 IEEE Symposium on Wireless Technology and Applications, ISWTA 20112011 IEEE Symposium on Wireless Technology and Applications, ISWTA 2011; 01/2011
  • [Show abstract] [Hide abstract]
    ABSTRACT: A 3.1–4.8 GHz mode-1 UWB CMOS mixer that utilizes simultaneous second- and third-order distortion cancellation is presented. The scheme is based on a new derivative superposition, employing PMOS as an auxiliary FET to cancel the second- and the third-order nonlinear currents of common-source transconductance in the mixer and gives rise to low-distortion operation for a broad range of gate-source voltage. Full Volterra series analysis of the proposed transconductance is reported to examine the effectiveness of the new technique. Simulations in a 0.13 μm CMOS technology demonstrate that IIP3 and IIP2 of the proposed mixer have 18 and 10 dB improvements, respectively, compared with conventional Gilbert-type mixer with the same power consumption. The robustness of the technique has been verified by Monte Carlo analysis. The mixer has a gain of 12 dB and noise figure of 13 dB, while drawing only 2.5 mA from 1.2 V supply voltage.
    Microelectronics Journal 01/2010; 41(1-41):1-8. DOI:10.1016/j.mejo.2009.10.005 · 0.84 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: A 1.2V Gilbert mixer with improved linearity and noise figure is presented. To improve the linearity, an optimum gate bias is applied to the transconductance stage, and a series LC network resonating around 2fLO is implemented at the common source nodes of the switch quad. Analysis shows that the flicker noise performance also benefits from the series resonating network. The 2.1GHz mixer fabricated with 0.13μm CMOS technology is demonstrated. Linearity measurement from two tone tests shows that the IMD3 is improved over a wide range of the input power level. Compared with the conventional Gilbert mixer, the IMD3 is improved by 13.1dB and the DSB noise figure measured at 1MHz intermediate frequency is improved by 3.7dB. The mixer consumes 3.5mA current from a 1.2V supply voltage.
Show more