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首页> 外文期刊>IEEE Journal of Solid-State Circuits >BiCMOS circuits for high speed current mode D/A converters
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BiCMOS circuits for high speed current mode D/A converters

机译：用于高速电流模式D / A转换器的BiCMOS电路

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摘要

A new BiCMOS current cell and a BiCMOS current switch for high speed, self-calibrating, current-steering D/A converters are described. The BiCMOS current cell can be realized in a BiCMOS process or in a conventional CMOS process using a substrate PNP transistor, while the BiCMOS current switch is intended for implementation in a BiCMOS process. The performance of these circuits has been demonstrated in 0.8 /spl mu/m BiCMOS and 1.2-/spl mu/m CMOS technologies. A detailed noise analysis of the BiCMOS current cell indicates that noise during the calibration phase limits its relative accuracy to about 150 ppm. This is substantiated by measured results which show a relative matching of about 100-150 ppm, which is the equivalent of about 13 b performance. Measurement results also indicate that the absolute accuracy of the BiCMOS current cell is better than 0.5% over the designed current range, which is better than that of previously reported designs. Test results for the BiCMOS current switch indicate that a 10-90% switching time of 0.9 ns has been achieved. Furthermore, the switching time of the new BiCMOS switch is very insensitive to current level and input waveform compared to conventional CMOS switches. A 4-b D/A converter based on these components has been fabricated, and test results have demonstrated that it is functional. This DAC will be used as the internal DAC of a /spl Sigma//spl Delta/ modulator for over-sampled video and digital radio applications.
机译：描述了一种新型的BiCMOS电流单元和一个BiCMOS电流开关，用于高速，自校准，电流控制D / A转换器。可以使用衬底PNP晶体管在BiCMOS工艺或常规CMOS工艺中实现BiCMOS电流单元，而BiCMOS电流开关旨在在BiCMOS工艺中实现。这些电路的性能已经在0.8 / spl mu / m的BiCMOS和1.2- / spl mu / m的CMOS技术中得到了证明。对BiCMOS电流单元的详细噪声分析表明，校准阶段的噪声将其相对精度限制在约150 ppm。这由测量结果证实，该结果显示约100-150 ppm的相对匹配，相当于约13 b的性能。测量结果还表明，BiCMOS电流单元的绝对精度在设计电流范围内优于0.5％，这优于先前报道的设计。 BiCMOS电流开关的测试结果表明，实现了0.9 ns的10-90％的开关时间。此外，与传统的CMOS开关相比，新型BiCMOS开关的开关时间对电流水平和输入波形非常不敏感。已经制造了基于这些组件的4-b D / A转换器，并且测试结果证明了它的功能。该DAC将用作/ spl Sigma // spl Delta /调制器的内部DAC，用于过度采样的视频和数字无线电应用。

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