采用嵌有交叉耦合晶体管对的LC谐振回路结构,利用其固有的多种振荡模式,设计了一款用于多标准射频收发器的压控振荡器(VCO)。该电路通过变容管开关偏置的作用,操作于高频串联谐振和低频并联谐振两个模式,并且输出的所有频率都与谐波无关。通过累积型MOS变容管的调谐作用对LC谐振回路的节点阻抗进行改变,实现振荡器在两个模式下的切换。基于TSMC 0. 18μm 1P6M CMOS工艺实现文中所提出的VCO,测试表明:该VCO的振荡频率为2.92 GHz~3.23GHz和7.31 GHz~8.2 GHz,该两个频带的相位噪声分别为-128.22 dBc/Hz@1 MHz和-123.2 dBc/Hz@1 MHz。

By exploiting the intrinsic multiple oscillation modes of LC resonator with cross-coupled transistor pair, a differential VCO is designed for multi-standard RF transceivers. It operates at the high frequency series-resonant and low-frequency parallel resonant mode via varactor switching bias. Both frequencies are not harmonically related. Accumulation-mode MOS varactor tuning changes the net impedance of LC-tank to shift the oscillations from one resonance mode to another. The proposed VCO has been implemented with the TSMC 0. 18 μm 1P6M CMOS technology and it can generate differential signals in the frequency range of 2.92 GHz ~3. 23 GHz and 7. 31 GHz ~8. 2 GHz. The measured phase noise is -128.22 dBc/ Hz and -123.2 dBc/Hz at a 1 MHz offset, respectively.

TN752