高可塑性射频通道增益温度补偿电路构架研究

Research on high plasticity radio frequency channel gain temperature compensation circuit architecture

介绍了高可塑性线性工作模式及压缩工作模式射频通道增益温度补偿电路架构。该补偿电路具有低功耗、高集成、小型化的优点,其主要由模拟衰减器和控制电路两部分组成。模拟衰减器动态范围约为20dB,位于射频链路中不影响噪声系数及输出功率的位置。控制电路是由4只正、负温度系数不同的阻值热敏电阻与待调电阻嵌套组成纯电阻网络,稳压后直流电压经过该电阻网络后得到随温度变化的控制电压。该控制电压随温度变化灵活,共有抛物线、碗状、正反L形状和正反斜率线性变化6种趋势,可完全满足射频通道线性工作模式和压缩工作模式增益稳定不同需求。对高可塑性射频通道增益温度补偿电路架构进行了原理分析,并给出具体设计过程。通过软件仿真和实物验证了电路架构合理有效。星载C频段接收机应用该补偿电路后,在-5℃~55℃范围内,增益温度稳定度约0.1dB,达到国际先进水平。

A research on the gain temperature compensation circuit architecture of radio frequency channel with high plasticity in linear or compressed operating mode was introduced.An analog attenuator and a control circuit were contained in the compensation circuit,which was characterized by low power consumption,high integration and miniaturized.The dynamic range of the analog attenuator was about 20dB,and it was located in the radio frequency link where the noise factor or output power was not affected.The control circuit was a pure resistance network,which consists of four thermistors with different positive and negative temperature coefficients and the resistance to be adjusted.After voltage regulation,the DC voltage was converted to a control voltage that varies with temperature through the resistance network.The control voltage was flexibly varied by temperature.Parabola,bowl shape,positive and negative L shape,positive and negative shape linear changes in a total of six trends were included in the voltage curve to meet the different requirements of gain stability of radio frequency channel which works in linear and compressed operating mode.In this paper,the principle of high plasticity radio frequency channel gain temperature compensation circuit architecture was analyzed,and the specific design process was presented.The circuit architecture was proved reasonable and effective by software simulation and real object.In the range of-5℃~55℃,the gain temperature stability of the satellite-borne C-band receiver is about 0.1dB,reaching the international advanced level.