题目/Title：A 12.5-to-15.4GHz, -118.9dBc/Hz PN at 1MHz offset, and 191.0dBc/Hz FoM VCO with Common-Mode Resonance Expansion
作者/Author：
Ruichang Ma, Haikun Jia, Wei Deng, Zhihua Wang, Baoyong Chi
会议/Conference：CICC 2022
地点/Location：Newport Beach, CA, USA
年份/Issue Date：2022.24-27 Apr.
页码/pages：pp.1-2
摘要/Abstract：
In recent years, common-mode resonance at twice the oscillation frequency has been proven to be an effective method to improve the FoM and phase noise performance of LC VCOs [1]–[4]. In [2], the implicit common-mode is proposed to merge the common-mode resonance tank into the VCO's main tank to save the chip area as shown in the left of Fig. 1. The VCO in [3] boosts both the common-mode impedance at 2ND harmonic and differential-mode impedance at 3 RD harmonic frequency to improve the FoM as shown in the middle of Fig. 1. However, manual harmonic tuning to align those harmonic resonance frequencies is needed in both VCOs in [2] and [3] to uphold an optimal performance over the tuning range. To avoid the manual harmonic tuning, an extra resonator is added to the main tank in [4], improving phase noise over a wide bandwidth. However, the extra head resonator inevitably increases the VCO's chip area.