一种4.224GHz正交压控振荡器的设计

设计了一种应用于MB-OFDM UWB射频频率综合器的工作于4.224GHz的正交压控振荡器(QVCO),并采用0.18μm RF-CMOS工艺进行了设计实现.该Qvco通过改进结构能够得到更好的相位噪声.通过改变MOS变容管的接入方法实现了更好的压控增益线性度,并采用了新的低寄生电容、低导通电阻的数控电容阵列结构来补偿工艺变化带来的频率变化.测试结果表明,该QV-CO在4.224GHz附近的100kHz频偏处的相位噪声为-90.4dBc/Hz,1MHz频偏处的相位噪声为-116.7dBc/Hz,整个QVCO电路功耗为10.55mW,电源电压为1.8V.

Design of a 4.224GHz Quadrature LC-VCO

A 4.224GHz quadrature voltage.controlled oscillator(QVCO)applied in MB-OFDM UWB synthesizers is im-plemented in 0.18μm RF-CMOS technology.An improved structure of the QVCO is presented for better phase noise.A novel configuration of a MOS varactor is designed for good linearity of Kvco,as well as a new digital capacitor controlled array topoiogy with lower parasitic capacitance and lower Ron Measurement results show a phase noise of-90.4dBc/Hz at 100kHz offset and-116.7dBc/Hz at 1MHz offset from a carrier close to 4.224GHz.The power dissipation is 10.55mW from a 1.8V supply.