This paper presents the structure and operational principles of high-frequency electronically controllable sinusoidal oscillators employing current-feedback operational amplifiers (CFOAs) with externally accessible compensation node $z$ as active components. The resonant circuits in the oscillators are connected to the terminal $z$, and for them in the selective network varactor diodes or varicaps as the variable capacitances are utilized, which are controlled by external DC voltage. Based on an analysis of the proposed circuit configurations, analytical expressions for the characteristic equation in a steady-state mode of operation and formulas for the basic electrical parameters have been obtained. In order to verify the functionality of the proposed electronic circuits and the effectiveness of the derived analytical expressions, an experimental and simulation study of sample electronic circuits with commercially available integrated circuit CFOAs AD844 in the frequency range up to about 10$$MHz is performed. The obtained results for the studied electronic circuits confirm the theoretical studies and hypotheses, and the comparative analysis shows that the maximum value for the relative error does not exceed 10%, which is acceptable considering the tolerances of the technological parameters of the used passive and active elements.

本文介绍了采用具有外部可访问补偿节点的电流反馈运算放大器 (CFOA) 的高频电子可控正弦振荡器的结构和工作原理$z$作为活性成分。振荡器中的谐振电路连接到端子$z$，并且对于它们来说，在选择性网络变容二极管或变容二极管中使用可变电容，其由外部直流电压控制。基于对所提出的电路配置的分析，获得了稳态工作模式下特征方程的解析表达式和基本电气参数的公式。为了验证所提出的电子电路的功能和导出的分析表达式的有效性，对具有市售集成电路CFOAs AD844的示例电子电路进行了实验和模拟研究，频率范围高达约10$$MHz 进行。所研究的电子电路获得的结果证实了理论研究和假设，比较分析表明相对误差的最大值不超过10%，考虑到所用无源和有源技术参数的容差，这是可以接受的元素。