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A 30-GHz Class-F Quadr ature DCO Using Phase Shifts Between DrainGateSource for
提出一种利用变压器实现Class-F操作的30GHz低相位噪声正交DCO，通过相位偏移解决闪烁噪声问题。
相位噪声-112dBc/Hz@1MHz, FoM -185dB, 调谐范围18%, 镜像抑制比>47dB
毫米波正交振荡器Class-F相位噪声变压器耦合
▸利用变压器实现Class-F操作和谐波提取
▸通过电容负载引入漏极到栅极的相位偏移以解决闪烁噪声不对称问题
▸在源极耦合中引入额外相位偏移以解决±90° I/Q模式模糊问题
Abstract
In this article, we present a low phase noise
(PN) mm-wave quadrature digitally controlled oscillator (DCO)
exploiting transformers for class-F operation and harmonic
extraction. A third transformer coil is added for the inter-core
coupling with the source terminals of the switching transistors.
We identify that the inter-core coupling in quadrature oscillators
causes an asymmetric flicker noise current, thus degrading flicker
PN. As a remedy, we propose a deliberate drain-to-gate phase
shift of t