SEMICONDUCTOR INTEGRATED CIRCUITS

A current-mode DAC unit circuit with smooth transition

Yidie Ye and Yinshui Xia

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 Corresponding author: Yinshui Xia, E-mail: xiayinshui@nbu.edu.cn

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Abstract: The digital-to-analogue converter (DAC) plays a significant role in modern electronic systems, and current-mode DACs are widely used due to their excellent properties. However, the non-ideal transition at switching instants of the unit circuit will directly affect the performance of the current-mode DAC. The parasitic effects resulting in non-ideal transition are analyzed in this paper. A simple structure unit circuit is proposed to diminish the non-ideal transition. The simulation results show that the parasitic effects are suppressed effectively, and a smoother output transition is achieved. The feasibility of the proposed current-mode DAC unit circuit is verified by the application in a frequency jitter circuit.

Key words: current-mode DAC unit circuitnon-ideal transitionparasitic effects suppression



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Fig. 1.  A typical structure of current-mode DAC unit circuit.

Fig. 2.  The output waveforms of the typical unit circuit at the switching instants (a) at switching-on instant and (b) at switching-off instant.

Fig. 3.  The equivalent parasitic capacitance.

Fig. 4.  The proposed current-mode DAC unit circuit.

Fig. 5.  The output comparison (a) at switching-on instant and (b) at switching-off instant.

Fig. 6.  Oscillator.

Fig. 7.  $V_{\rm m}$ generating circuit implemented by the proposed current-mode DAC unit circuit.

Fig. 8.  The simulation results. (a) Comparison of $V_{\rm m}$. (b) CLK ($V_{\rm m}$ from Figure 7).

Fig. 9.  The simulation results of spectrum graph of oscillator output signal CLK.

Fig. 10.  The chip photo.

Fig. 11.  The experimental results of CLK. (a) Time domain graph. (b) Spectrum graph.

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Table 1.   Comparison of the output characteristics.

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    Received: 16 April 2015 Revised: Online: Published: 01 July 2015

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      Yidie Ye, Yinshui Xia. A current-mode DAC unit circuit with smooth transition[J]. Journal of Semiconductors, 2015, 36(7): 075006. doi: 10.1088/1674-4926/36/7/075006 Y D Ye, Y S Xia. A current-mode DAC unit circuit with smooth transition[J]. J. Semicond., 2015, 36(7): 075006. doi: 10.1088/1674-4926/36/7/075006.Export: BibTex EndNote
      Citation:
      Yidie Ye, Yinshui Xia. A current-mode DAC unit circuit with smooth transition[J]. Journal of Semiconductors, 2015, 36(7): 075006. doi: 10.1088/1674-4926/36/7/075006

      Y D Ye, Y S Xia. A current-mode DAC unit circuit with smooth transition[J]. J. Semicond., 2015, 36(7): 075006. doi: 10.1088/1674-4926/36/7/075006.
      Export: BibTex EndNote

      A current-mode DAC unit circuit with smooth transition

      doi: 10.1088/1674-4926/36/7/075006
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      Project supported by the National Natural Science Foundation of China (No. 61401243) and the Scientific Research Foundation of Ningbo University, China (No. xkl1331).

      More Information
      • Corresponding author: E-mail: xiayinshui@nbu.edu.cn
      • Received Date: 2015-04-16
      • Accepted Date: 2015-05-17
      • Published Date: 2015-01-25

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