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采用约瑟夫逊结RSJ模拟器,对约瑟夫逊结的基波和谐波混频器进行了研究。用辅助电路和微型计算机系统在不同工作参数下测量了混频器中频输出(V_(IF))和结微分电阻(R_D)值,得到了谐波混频器的最大变频效率(η)与谐波次数(N)、本振电流(i_(LO))变化的关系。文中还给出了基波和二次谐波的最大变频效率随归一化本振频率(Ω(LO))变化的关系。实验结果表明,约结谐波混频器的工作状态取决于N是偶数还是奇数,偶次谐波混频器可以工作在零偏置和一定偏置这2种状态,而奇次谐波混频器仅能工作在一定偏置状态。在Ω(LO)≤0.36区域,二次谐波混频器的零偏置状态比一定偏置状态有较大的变频效率;而对Ω(LO)≤0.31,零偏置状态的二次谐波混频器比基波混频器有较大的变频效率。
The Josephson junction RSJ simulator was used to study the fundamental and harmonic mixer of Josephson junction. Using the auxiliary circuit and the microcomputer system, the intermediate frequency output (V_ (IF)) and the junction differential resistance (R_D) of the mixer were measured under different operating parameters to obtain the maximum frequency conversion efficiency (η) Wave number (N), local oscillator current (i_ (LO)). The paper also gives the relationship between the maximum frequency conversion efficiency of fundamental wave and second harmonic with the normalized local oscillation frequency (Ω (LO)). The experimental results show that the operating state of the harmonic oscillator depends on whether the N is even or odd, even harmonic mixer can work in the zero bias and bias of these two states, while the odd harmonic mixing Frequency can only work in a certain bias state. In the region of Ω (LO) ≤0.36, the zero-bias state of the second harmonic mixer has a larger frequency conversion efficiency than that of a certain bias state. For Ω (LO) ≤0.31, the second harmonic Wave mixer has a larger frequency conversion efficiency than the fundamental mixer.