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A 9-12 GHz 5-bit active LO phase shifter with a new vector sum method

Changming Chen, Wei Li, Ning Li and Junyan Ren

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 Corresponding author: Wei Li, E-mail: w-li@fudan.edu.cn

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Abstract: This paper presents a 5-bit active LO phase shifter with a new vector sum method for 9-12 GHz applications. The 5-bit phase shifter is composed of four 3-bit sub phase shifters by adopting the new vector sum method, which reduces the requirements on the resolution of the variable gain amplifier (VGA). The variable gain function is realized by switch on/off parallel input transistor pairs rather than changing the bias current of the VGA, which avoids the linearity variation and drain-source voltage variation existing in the quadrature vector sum active phase shifter. The 5-bit active LO phase shifter is fabricated in TSMC 0.13 μm CMOS technology. The measured results show that the phase shifter achieves 5-bit phase shift accuracy. The average conversion gain for 32 phase states is-0.5 to 7 dB from 9 to 12 GHz. The RMS gain error and the RMS phase error are smaller than 0.8 dB and 4° respectively. The current consumption is 27.7 mA from a 1.2 V supply voltage.

Key words: activephase shiftervector sumLOCMOS



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Fig. 1.  Schematic of the quadrature vector sum active phase shifter[6].

Fig. 2.  The $P_{\rm 1dB}$ of the I-VGA with $\phi =0^\circ$ and $\phi =45^\circ$.

Fig. 3.  Simulated gain and phase difference between 0$^\circ$ and 45$^\circ$ versus input power.

Fig. 4.  The sum of two vectors.

Fig. 5.  Generating an 11.25$^\circ$ vector using (a) quadrature vector sum and (b) new vector sum method.

Fig. 6.  Realizing the variable gain function (a) by adjusting bias current and (b) by switching on/off parallel input transistors.

Fig. 7.  System architecture.

Fig. 8.  Topology of the RC-based two-stage poly phase filter.

Fig. 9.  Decomposition of the differential-phase inputs into two parts of quadrature-phase inputs.

Fig. 10.  The post simulation results of the PPF. (a) The loss with and without output inductors. (b) I/Q amplitude and phase difference.

Fig. 11.  Schematic of the 3-bit sub phase shifter.

Fig. 12.  Simulated gain and phase difference between 0$^\circ$ and 45$^\circ$ versus input power.

Fig. 13.  Simulated eight output phases of the 3-bit sub phase shifter.

Fig. 14.  Schematic of the down-conversion mixer.

Fig. 15.  Chip photograph of the proposed phase shifter.

Fig. 16.  Measurement setup of the LO phase shifter.

Fig. 17.  Measured result of the RF input return loss.

Fig. 18.  Measured conversion gain for 32 phase states.

Fig. 19.  Measured 5-bit phase responses.

Fig. 20.  Measured RMS gain error and RMS phase error.

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Table 1.   The synthesis of the 9 phase states in the first quadrant.

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Table 2.   Parameters of the 3-bit sub phase shifter.

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Table 3.   Parameters of the down-conversion mixer.

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Table 4.   Performance summary and comparison.

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    Received: 17 June 2014 Revised: Online: Published: 01 January 2015

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      Changming Chen, Wei Li, Ning Li, Junyan Ren. A 9-12 GHz 5-bit active LO phase shifter with a new vector sum method[J]. Journal of Semiconductors, 2015, 36(1): 015002. doi: 10.1088/1674-4926/36/1/015002 C M Chen, W Li, N Li, J Y Ren. A 9-12 GHz 5-bit active LO phase shifter with a new vector sum method[J]. J. Semicond., 2015, 36(1): 015002. doi: 10.1088/1674-4926/36/1/015002.Export: BibTex EndNote
      Citation:
      Changming Chen, Wei Li, Ning Li, Junyan Ren. A 9-12 GHz 5-bit active LO phase shifter with a new vector sum method[J]. Journal of Semiconductors, 2015, 36(1): 015002. doi: 10.1088/1674-4926/36/1/015002

      C M Chen, W Li, N Li, J Y Ren. A 9-12 GHz 5-bit active LO phase shifter with a new vector sum method[J]. J. Semicond., 2015, 36(1): 015002. doi: 10.1088/1674-4926/36/1/015002.
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      A 9-12 GHz 5-bit active LO phase shifter with a new vector sum method

      doi: 10.1088/1674-4926/36/1/015002
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      Project supported by the National Natural Science Foundation of China (No. 61376037) and the National Twelve-Five Project (No. 513***)

      More Information
      • Corresponding author: E-mail: w-li@fudan.edu.cn
      • Received Date: 2014-06-17
      • Accepted Date: 2014-08-25
      • Published Date: 2015-01-25

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