Four new circuits of fully uncoupled quadrature sinusoidal oscillators, using two current differencing buffered amplifiers (CDBAs), four/five resistors and two capacitors have been presented. In contrast to all previously published CDBA-based, fully decoupled, quadrature sinusoidal oscillators in which one of the input terminals is left unutilized, the presented circuits are realized by utilizing the intrinsic current differencing property of CDBAs, thus utilizing all the four terminals of the CDBA. All these quadrature oscillator (QO) circuits have an inherent feature of amplitude control of output voltages without using external control circuitry. Out of the four proposed QO circuits, two circuits have the additional feature of generating low-frequency oscillations, thus making them capable of generating wide range of frequency waveforms. The proposed oscillator circuits also possess additional functionalities not available in other CDBA-based quadrature sinusoidal oscillator circuits presented previously. The workability of the proposed circuits has been confirmed through experimental results where CDBAs are implemented using commercially available current feedback operational amplifiers (AD844).

中文翻译：

---

使用 CDBA 的正交正弦振荡器：新的实现

介绍了四个新的完全非耦合正交正弦振荡器电路，使用两个电流差分缓冲放大器 (CDBA)、四个/五个电阻器和两个电容器。与之前发布的所有基于 CDBA 的、完全解耦的、正交正弦振荡器（其中一个输入端子未使用）相比，所提出的电路是通过利用 CDBA 的固有电流差分特性实现的，从而利用了所有四个端子CDBA。所有这些正交振荡器 (QO) 电路都具有输出电压幅度控制的固有特性，而无需使用外部控制电路。在四个提议的 QO 电路中，有两个电路具有产生低频振荡的附加特征，从而使它们能够产生宽范围的频率波形。所提出的振荡器电路还具有之前介绍的其他基于 CDBA 的正交正弦振荡器电路所不具备的附加功能。通过使用商用电流反馈运算放大器 (AD844) 实现 CDBA 的实验结果，已证实所提出电路的可操作性。