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本文讨论了变电容负阻式参量放大器与电子管放大器联级运用时的一些问题。分析了参放一共阴，参放一共栅和参放一共阳三种放大器组合的噪声系数与天线内电导及等效负电导的关系。求出了它们在最佳耦合时的最低噪音系数。 文章还对放大器的稳定性能进行分析，前提出衡量稳定度的标准。分析结果表明，对放大器的噪声系数和增益的要求，与放大器的稳定度是矛盾的，即噪声系数愈小，增益愈高，则放大器的稳定性愈差。 文章进一步讨论了在稳定度给定的条件下各种放大器组合可能得到的最低噪声系数。可以看出，在相同的条件下参放一共栅放大器组合的最低噪声系数最小，参放一共阴次之，参放一共阳最大。 讨负阻式参放──共栅放大器的组合线路进行了试验，所得结果与理论分析基本上是一致的。
This article discusses some of the problems encountered when the variable capacitance, negative resistance, parametric amplifiers and tube amplifiers are used in tandem. The relationship between the noise figure and the internal and external negative conductance of the three amplifier combinations is analyzed. The lowest noise figure for the best coupling is obtained. The article also analyzes the stability of the amplifier, before the standard measure of stability. The analysis results show that the requirements of the noise figure and gain of the amplifier are contradictory to the stability of the amplifier. That is, the smaller the noise figure is, the higher the gain is, the worse the stability of the amplifier is. The article further discusses the lowest possible noise figure that can be obtained for the various amplifier combinations for a given stability. It can be seen that under the same conditions, the lowest noise figure of the total gate amplifier combination is the smallest, and the total noise figure is the lowest. Discuss the negative resistance of the participating ─ ─ common-gate amplifier circuit was tested, the results obtained and the theoretical analysis is basically the same.