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An Efficient Bias Circuit of Discrete BJT Component for Hearing Aid  

성광수 (영남대학교 전자정보공학부)
장형식 (영남대학교 전자정보공학부)
현유진 (영남대학교 전자정보공학부)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SC / v.40, no.6, 2003 , pp. 16-23 More about this Journal
Abstract
In this paper, we propose an efficient bias circuit of discrete BJT component for hearing aid. The collector feedback bias circuit, widely used for the hearing aid, has a resistor for negative feedback. As the resistor affects AC and DC simultaneously, it is quite difficult to adjust amplifier gain without changing DC bias point. The previous bias circuit also has weak point to be oscillated by the positive feedback of power noise if gain of hearing aid is high. In the proposed circuit, we can reduce the two weak points of the previous circuit by adding a resistor to the collector feedback bias circuit between base and power supply which is $\beta$ times target than the collector resistor. Thus. we can change amplifier gain without changing DC bias point, and reduce power noise gain about 18.5% compare to that of tile previous circuit in the simulation.
Keywords
BJT; DC bias circuit; collect feedback circuit; hearing aid;
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