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A high linearity downconverter for SAW-less LTE receivers

Jiang Peichen, Guan Rui, Wang Wufeng, Chen Dongpo and Zhou Jianjun

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Abstract: This paper presents a high linearity downconverter implemented in a 0.18 μm CMOS process for long term evolution (LTE) receivers without a surface acoustic wave (SAW) filter. The proposed downconverter is composed of a transconductance (Gm) stage, a passive mixer, a current buffer, a transimpedance (TIA) stage, and a DC-offset cancellation (DCOC) loop. The current buffer is utilized to provide very low load impedance for the passive mixer at high frequencies and reduce the output voltage swing induced by out-of-band blockers. This technique improves the input referred third-order intercept point (IIP3) and second-order intercept point (IIP2) of the downconverter by 4.5 dB and 11 dB, respectively. The measured results show that the proposed downconverter achieves a voltage conversion gain of 29.5 dB, double sideband noise figure of 12.7 dB, out-of-band IIP3 of 13 dBm and IIP2 of more than 62 dBm.

Key words: linearitydownconverterlong term evolution (LTE)passive mixerradio-frequency (RF) receivers

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    Received: 20 August 2015 Revised: 11 April 2012 Online: Published: 01 October 2012

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      Jiang Peichen, Guan Rui, Wang Wufeng, Chen Dongpo, Zhou Jianjun. A high linearity downconverter for SAW-less LTE receivers[J]. Journal of Semiconductors, 2012, 33(10): 105002. doi: 10.1088/1674-4926/33/10/105002 Jiang P C, Guan R, Wang W F, Chen D P, Zhou J J. A high linearity downconverter for SAW-less LTE receivers[J]. J. Semicond., 2012, 33(10): 105002. doi: 10.1088/1674-4926/33/10/105002.Export: BibTex EndNote
      Citation:
      Jiang Peichen, Guan Rui, Wang Wufeng, Chen Dongpo, Zhou Jianjun. A high linearity downconverter for SAW-less LTE receivers[J]. Journal of Semiconductors, 2012, 33(10): 105002. doi: 10.1088/1674-4926/33/10/105002

      Jiang P C, Guan R, Wang W F, Chen D P, Zhou J J. A high linearity downconverter for SAW-less LTE receivers[J]. J. Semicond., 2012, 33(10): 105002. doi: 10.1088/1674-4926/33/10/105002.
      Export: BibTex EndNote

      A high linearity downconverter for SAW-less LTE receivers

      doi: 10.1088/1674-4926/33/10/105002
      Funds:

      The National High Technology Research and Development Program of China (863 Program)

      • Received Date: 2015-08-20
      • Accepted Date: 2012-02-29
      • Revised Date: 2012-04-11
      • Published Date: 2012-09-10

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