一种低调谐增益变化的宽带电感电容压控振荡器

A Wideband LC-VCO with Small Tuning Gain Fluctuation

设计了一个应用于数字电视调谐器的宽带电感电容压控振荡器.该振荡器包含了一个开关可变电容阵列,用以抑制调谐增益的变化.整个电路采用0.18μm CMOS工艺实现.测试结果表明:压控振荡器的频率范围从1.17GHz至2.03GHz(53.8%);调谐增益从69MHz/V变化至93MHz/V,其变化幅度与最大值相比为25.8%;最差相位噪声为-126dBc/Hz@1MHz;在1.5V电源电压下,压控振荡器的功耗约为9mW.

This paper presents a fully integrated wideband LC voltage-controlled oscillator （VCO） with small tuning gain fluctuation. This VCO is designed for a dual-conversion low-IF architecture （DLIF） DTV tuner. A switched varactor array is proposed to sup- press tuning gain fluctuation for the performance of the phase locked loop （PLL）. The whole VCO was implemented in a 0. 18μm CMOS process. The measured results show - 126dBc/Hz phase noise at 1MHz offset frequency. The measured tuning range is 860MHz （53. 8%） from 1.17 to 2.03GHz with the tuning gain from 69 to 93MHz/V. Power consumption is about 9mW with a 1.5V supply voltage.