单片CDCTA-C低功耗电控调谐双模式三阶正交振荡器的设计

Design of Low-Power Electronically Controllable Dual-Mode Third-Order Quadrature Oscillator Using Single CDCTA-C

针对振荡器功耗大和振荡频率低的问题,提出了一种基于电流差分级联跨导放大器的三阶正交振荡电路.该电路仅使用一个电流差分级联跨导放大器和三个接地无源电容,可以同时产生两组等幅正交电流信号和一组等幅正交电压信号.电路结构简单,功耗低至1.8m W,最大灵敏度绝对值仅0.5,振荡频率可达10MHz数量级,而且振荡条件和震荡频率可相互独立地电控调谐.计算机模拟和流片芯片测试结果验证了理论分析的正确性.

In order to solve problems of high power consumption and low oscillation frequency in oscillator, this work presents a third-order quadrature oscillator circuit employing CDCTA （Current Differencing Cascaded Transconductance Amplifiers）. The proposed structure employing only one CDCTA and three grounded passive capacitors realizes four explicit quadrature current outputs and two quadrature voltage outputs simultaneously, Meanwhile, the circuit power consumption is only 1.8mW, the maximum sensitivities value of only 0.5 and the oscillation frequency of up 10MHz magnitude. Moreover, its oscillation condition and oscillation frequency can be tuned electronically and independently. Results from computer simu- lation and hardware experiment validated the theoretical analysis of the circuit.