More Enhanced Swing Colpitts Oscillators: A Circuit Analysis
More Enhanced Swing Colpitts Oscillators: A Circuit Analysis
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DOI：
10.3390/electronics11182808
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发表时间：
2022-09
期刊：
影响因子：
2.9
通讯作者：
T. Nomura;T. Tanzawa
中科院分区：
文献类型：
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作者：
T. Nomura;T. Tanzawa
在本文中，我们证明了附加的电感器-电容器-电感器滤波器可以增加增强型摆动科尔皮兹振荡器（ESCO）的振荡幅度，并将这种拓扑称为增强型摆动科尔皮兹振荡器（mESCO）。当它与整流器连接时，可以提高DC-DC升压转换比，特别是对于低压传感器IC或能量收集。本文重点研究mESCO的电气特性。振荡频率被建模为 mESCO 电路参数的函数。公共栅极电压增益 (ACG) 由 mESCO 开关 MOSFET 的漏极电压幅度与源极电压幅度之比定义，也是在所有电路元件均为理想状态的假设下进行建模的。该模型通过 SPICE 仿真进行了验证。对于 ACG < 1.5，该模型与 SPICE 结果在 10% 以内吻合良好。此外，当使用长沟道肖克利模型时，假设半周期内MOSFET的平均跨导为零，对漏极电压幅度vda进行建模。 vda 需要足够高才能具有大的 DC-DC 升压转换比。该模型可以预测随着 ACG 接近统一，vda 增加的趋势。我们发现，即使电路参数以及ACG发生变化，漏极电压幅度与源极电压幅度的电压差也是恒定的。
In this paper, we show that an additional inductor–capacitor–inductor filter can increase the oscillation amplitude of the enhanced swing Colpitts oscillator (ESCO), and call this topology the more enhanced swing Colpitts oscillator (mESCO). When it is connected with a rectifier, the DC–DC boost conversion ratio can be increased, especially for low-voltage sensor ICs or energy harvesting. This paper focuses on the electrical characteristics of mESCO. The oscillation frequency was modeled as a function of the circuit parameters of mESCO. The common gate voltage gain (ACG), defined by the ratio of the drain voltage amplitude to the source voltage amplitude of the switching MOSFET of mESCO, was also modeled under the assumption that all the circuit elements are ideal. The model was validated with a SPICE simulation. For ACG < 1.5, the model was in good agreement with the SPICE results within 10%. In addition, the drain voltage amplitude vda was modeled by assuming that the average transconductance of the MOSFET in a half cycle is null when the long-channel Shockley model is used. vda needs to be sufficiently high to have a large DC–DC boost conversion ratio. The model can predict the tendency that vda increases as ACG approaches unity. We found that the voltage difference of the drain voltage amplitude to the source voltage amplitude is a constant even when the circuit parameters, and thereby ACG are varied.