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在负阻抗式LC振荡器的基础上配以不同型式的测头,就可以构成不同用途的电感式传感器,现将我们试制的结果介绍于下。一、负阻抗式LC振荡器用一个运算放大器与相应的外部电路就可以构成一个负阻抗变换器。如图1所示,从端口11’处视入的电阻R_i为一个负电阻 R_i=—KR_L其中 K=R_1/R_2为变换系数。当在11’处接入一个LC 回路后,恰当地调节R_L就能使负电阻R_i正好等于LC回路中的等效正电阻。这样,整个系统就变成一个无损耗的LC回路,当稍有外来激励时就能形成等幅的正弦振荡,详细分析请参考本刊1984年第6期第41页。
Based on the negative impedance LC oscillator with different types of probe, you can form a different use of inductive sensors, now we trial results introduced below. First, the negative impedance LC oscillator with an operational amplifier and the corresponding external circuit can form a negative impedance converter. As shown in Figure 1, the resistance R_i as seen from the port 11 ’is a negative resistance R_i = -KR_L where K = R_1 / R_2 is the conversion factor. When an LC loop is connected at 11 ’, properly adjusting R_L enables the negative resistance R_i to be exactly equal to the equivalent positive resistance in the LC loop. In this way, the whole system becomes a lossless LC loop, which forms a sinusoidal oscillation of equal amplitude when slightly excited externally. For a detailed analysis, please refer to Issue 4, 1984, p. 41.