公开(公告)号：US20080143446A1

公开(公告)日：2008-06-19

申请号：US11957482

申请日：2007-12-17

申请人： Chih-Wei Yao ,  Alan Neil Willson

发明人： Chih-Wei Yao ,  Alan Neil Willson

IPC分类号： H03B27/00 ,  H03B5/12

CPC分类号： H03B27/00 ,  H03B5/1212 ,  H03B5/1215 ,  H03B5/1228 ,  H03B5/1253 ,  H03B2200/0074

摘要： A tail-tank coupling technique combines two complementary differential LC-VCOs to form a quadrature LC-VCO. The technique reduces phase noise by providing additional energy storage for noise redistribution and by cancelling noise injected by transistors when they operate in the triode region. The resulting noise factor is close to the theoretical minimum 1+γ, similar to a differential LC-VCO driven by an ideal noiseless current source. However, its figure-of-merit is higher, due to the absence of voltage head-room being consumed by a current source. The optimal ratio of tail-tank capacitor to main-tank capacitor for minimizing phase noise is approximately 0.5. The method can be extended to combine any even number of LC tanks resonating at fo and 2fo to form an integrated oscillator producing quadrature phase at frequency fosc and differential output at 2fosc.

摘要翻译： 尾箱耦合技术结合了两个互补的差分LC-VCO来形成正交LC-VCO。 该技术通过为噪声再分配提供额外的能量存储并通过消除晶体管在三极管区域中工作时注入的噪声来降低相位噪声。 所产生的噪声系数接近理论最小值1 +γ，类似于由理想无噪声电流源驱动的差分LC-VCO。 然而，由于电流源没有电压头部消耗，其品质因数更高。 用于最小相位噪声的尾箱电容器与主柜电容器的最佳比例约为0.5。 该方法可以被扩展以组合在f 0和2 f 0上共振的任何偶数个LC槽，以形成一个在频率f osc处产生正交相位的集成振荡器， / SUB>和2f 之间的差分输出。

公开(公告)号：US07847650B2

公开(公告)日：2010-12-07

申请号：US11957482

申请日：2007-12-17

申请人： Chih-Wei Yao ,  Alan Neil Willson, Jr.

发明人： Chih-Wei Yao ,  Alan Neil Willson, Jr.

IPC分类号： H03B5/08 ,  H03B5/18

CPC分类号： H03B27/00 ,  H03B5/1212 ,  H03B5/1215 ,  H03B5/1228 ,  H03B5/1253 ,  H03B2200/0074

摘要： A tail-tank coupling technique combines two complementary differential LC-VCOs to form a quadrature LC-VCO. The technique reduces phase noise by providing additional energy storage for noise redistribution and by cancelling noise injected by transistors when they operate in the triode region. The resulting noise factor is close to the theoretical minimum 1+γ, similar to a differential LC-VCO driven by an ideal noiseless current source. However, its figure-of-merit is higher, due to the absence of voltage head-room being consumed by a current source. The optimal ratio of tail-tank capacitor to main-tank capacitor for minimizing phase noise is approximately 0.5. The method can be extended to combine any even number of LC tanks resonating at fo and 2fo to form an integrated oscillator producing quadrature phase at frequency fosc and differential output at 2fosc.

摘要翻译： 尾箱耦合技术结合了两个互补的差分LC-VCO来形成正交LC-VCO。 该技术通过为噪声再分配提供额外的能量存储并通过消除晶体管在三极管区域中工作时注入的噪声来降低相位噪声。 所产生的噪声系数接近理论最小值1 +γ，类似于由理想无噪声电流源驱动的差分LC-VCO。 然而，由于电流源没有电压头部消耗，其品质因数更高。 用于最小相位噪声的尾箱电容器与主柜电容器的最佳比例约为0.5。 该方法可以扩展到组合在fo和2fo共振的任何偶数个LC箱，以形成一个集成振荡器，产生频率fosc的正交相位和在2fosc处的差分输出。