Abstract：The dependence of PHEMT's drain current and gain on temperature were analyzed.It was found that the current and gain decreased with temperature increase.Two methods were presented for automatically compensating the temperature dependence and their principals were analyzed.A series source resistor could keep the PHEMT's drain nearly unchangeable and decrease the temperature effect on the amplifier gain to some content.However,the automatic gate voltage temperature compensation was a strong compensation.It increased the gate voltages and PHEMT's transconductance with the temperature increase,thus greatly decreased the temperature effect on the gain.The two methods were then combined and applied to a broadband low noise amplifier.Good experimental results were obtained.When the temperature increased from -55℃ to +85℃ and from -55℃ to +125℃,the amplifier gain drop decreased by 60% and 51% at 6 GHz,respectively,which greatly improved the gain-temperature feature of the amplifier.
彭龙新;杨乃彬;林金庭. 宽带单片低噪声放大器的增益温度补偿[J]. 电子学报, 2006, 34(5): 934-937.
PENG Long-xin;YANG Nai-bin;LIN Jin-ting. The Temperature Compensation for MMIC Broadband Amplifier Gain. Chinese Journal of Electronics, 2006, 34(5): 934-937.