Chin. J. Semicond. > 2007, Volume 28 > Issue S1 > 439-442

Non-Uniform Emitter Ballasting Resistor Design of Multi-Finger Power HBTs with a Thermal-Electrical Model

Jin Dongyue, Zhang Wanrong, Xie Hongyun, Wang Yang and Qiu Jianjun

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Abstract: Taking into account of the temperature dependenee of base-emitter voltage and the additional ballasting resistor in emitter.an improved three.dimensional thermal.electrical model is presented to study the temperature distribution in power heteroiunction bipolar transistor(HBT).It is found that multi-finger HBT with uniform emitter ballasting resistor exhibits a higher temperature at the center of the device,which reduces the power.handing capability of HBT.Therefore,non-uniform emitter ballasting resistor design of multi-finger power HBT is presented to improve the power-handing capability of HBT. Taking 12-finger Si0.8 Ge0.2 HBT for example,the design procedure of non-uniform emitter ballasting resistor is described in detail.Compared with the uniform design,the center finger temperature reduces obviously and the device temperature distri- bution is uniform with the design of non.uniform emitter ballasting resistor under the condition that the total emitter ballast- ing resistance is the same. Furthermore,it is found that the temperature distribution is more uniform with the exponential variation of emitter ballasting resistance. As a result, the power-handing capability of HBT is improved obviously。which is beneficial to the design of power HBT.

Key words: heterojunction bipolar transistorthermal·electrical modelemitter ballasting resistor

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    Received: 27 May 2016 Revised: Online: Published: 01 January 2007

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      Jin Dongyue, Zhang Wanrong, Xie Hongyun, Wang Yang, Qiu Jianjun. Non-Uniform Emitter Ballasting Resistor Design of Multi-Finger Power HBTs with a Thermal-Electrical Model[J]. Journal of Semiconductors, 2007, In Press. Jin D Y, Zhang W R, Xie H Y, Wang Y, Qiu J J. Non-Uniform Emitter Ballasting Resistor Design of Multi-Finger Power HBTs with a Thermal-Electrical Model[J]. Chin. J. Semicond., 2007, 28(S1): 439.Export: BibTex EndNote
      Citation:
      Jin Dongyue, Zhang Wanrong, Xie Hongyun, Wang Yang, Qiu Jianjun. Non-Uniform Emitter Ballasting Resistor Design of Multi-Finger Power HBTs with a Thermal-Electrical Model[J]. Journal of Semiconductors, 2007, In Press.

      Jin D Y, Zhang W R, Xie H Y, Wang Y, Qiu J J. Non-Uniform Emitter Ballasting Resistor Design of Multi-Finger Power HBTs with a Thermal-Electrical Model[J]. Chin. J. Semicond., 2007, 28(S1): 439.
      Export: BibTex EndNote

      Non-Uniform Emitter Ballasting Resistor Design of Multi-Finger Power HBTs with a Thermal-Electrical Model

      • Received Date: 2016-05-27
      • Published Date: 2016-04-28

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