无源和有源耦合LC正交振荡器谐振腔相移的改进

Marzieh Chaharboor, Hojat Ghonoodi
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引用次数: 4

摘要

提出了一种新型的互补拓扑有源无源耦合CMOS LC正交振荡器。采用无噪声无源元件对两个相同的LC振荡器进行耦合。LC振荡器的核心通过放置在NMOS交叉耦合开关对栅极中的四个相同的电容器进行耦合。由于无源耦合技术被称为产生正交信号的无噪声方法,因此使用这种技术可以降低噪声和耗散功率。然而,直接注入到导致振荡器核心同步和防止输出信号产生的输出节点,应该避免,因此一个额外的RLC滤波器放置在门和开关对的漏极之间。电容器为无源耦合网络提供交流通道,电感为无源耦合网络提供直流通道,它们对边带噪声起到带通滤波器的作用,从而改善了相位噪声。但是,当LC罐之间不匹配时,相位精度较低。因此,采用另一种耦合技术来降低电路的灵敏度并消除由于不匹配引起的相位误差。因此,与其他无源耦合QOs相比,在增加有源耦合网络后,lc - QOs的相位精度得到了进一步提高。耦合性能也不发生在过零点(最脆弱的时刻),因此不会降低相位噪声性能。为了评估在降低相位灵敏度的情况下所提出的改进相位噪声的QO的有效性,在0.18 TSMC CMOS实际技术中,在3.038 GHz中心频率下进行了仿真。LC-QO在1.8V电源下消耗5.988 mW,相位噪声为- 123.264 (dBc/Hz) @ 1mhz和- 132.9 (dBc/Hz) @ 3mhz,质量因子(Q=12),是理想的。性能因数(FOM)达到−185.14 (dBc/Hz)。仿真结果验证了所提LC-QO的可靠性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Improved resonator phase shift in passive and active coupled LC Quadrature Oscillator
A new passive and active coupled CMOS LC Quadrature Oscillator (LC-QO) in the complementary topology is proposed by this paper. The noiseless passive elements are employed to couple two identical LC oscillators. The cores of LC oscillators are coupled via four identical capacitors which are placed in the gates of NMOS cross-coupled switching pairs. Using this technique leads to lower noise and lower dissipation power since the passive coupling techniques are known as noiseless methods for generating quadrature signals. However, the direct injection into the out-put nodes which leads to the oscillator's cores be synchronized and prevents out-put signals to be generated, should be avoided and therefore an extra RLC filter placed between the gates and drains of switching pairs. The capacitor provides AC path and the inductor provides DC path for the passive coupling network, they act as a Bandpass filter for the side-band's noise and result in the phase noise improvement. However, when mismatches occurred between LC tanks, phase accuracy is low. Therefore, another coupling technique is employed in order to reduce the circuit's sensitivity and removes the phase error due to mismatches. So, with the additional active coupling network, phase accuracy of the proposed LC-QO improved further compared with other passive coupled QOs. The coupling performance also performed not at zero-crossing points (the most vulnerable instants), so doesn't degrade phase noise performance. To evaluate the validity of the improved-phase noise proposed QO with the reduced phase sensitivity, it is simulated at 3.038 GHz central frequency in the practical 0.18 TSMC CMOS technology. The LC-QO consumes 5.988 mW from a 1.8V power supply, phase noise is −123.264 (dBc/Hz) @1 MHz and −132.9 (dBc/Hz) @3 MHz offset frequencies with the quality factor (Q=12) and is desirable. The Figure of Merit (FOM) of − 185.14 (dBc/Hz) achieved. The obtained simulation results confirm the reliability of the proposed LC-QO.
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