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1. 发明授权

US06744324B1 Frequency synthesizer using a VCO having a controllable operating point, and calibration and tuning thereof 有权
标题翻译：使用具有可控工作点的VCO的频率合成器，以及其校准和调谐
公开(公告)号：US06744324B1
公开(公告)日：2004-06-01
申请号：US10413862
申请日：2003-04-14
申请人： Andrew R. Adams , Neil H. Weste , Stephen C. Avery
发明人： Andrew R. Adams , Neil H. Weste , Stephen C. Avery
IPC分类号： H03L708
CPC分类号： H03L7/185 , H03F1/0277 , H03F3/45183 , H03F3/45659 , H03F3/72 , H03F2203/45418 , H03F2203/45652 , H03F2203/7203 , H03F2203/7224 , H03J2200/10 , H03L7/07 , H03L7/0891 , H03L7/099 , H03L7/10 , H03L7/18
摘要： A frequency synthesizer, a calibrator thereof, and an operating controller thereof are described. The synthesizer comprises a main charge pump that drives a voltage controlled oscillator (VCO) through a loop filter. The calibrator includes a second, replica charge pump that can also drive the VCO, but is set up to output only its maximum or minimum analog output control voltage. Since the construction and characteristics of the replica charge pump duplicate the main charge pump, the main charge pump's minimum and maximum analog control outputs can be cloned out to the VCO on demand. A VCO calibration procedure therefore includes switching the VCO to each of its ranges set by a bank of fixed capacitors, and using the replica charge pump to drive the VCO to its minimum and maximum frequency for each range setting. The min-max frequency data is stored in a lookup table, and operational requests to switch to a new channel frequency can be supported with a priori information about which fixed-capacitor range selection will be best. The operating point controller includes a sensor to sense the operating point and a controller that provides a switching input to a switchable bank of capacitors to change the operating point. The change can be determined according to calibration data.
摘要翻译：描述了频率合成器，校准器及其操作控制器。合成器包括通过环路滤波器驱动压控振荡器（VCO）的主电荷泵。校准器包括第二个复制电荷泵，也可以驱动VCO，但是其设置为仅输出其最大或最小模拟输出控制电压。由于复制电荷泵的结构和特性与主电荷泵重复，主电荷泵的最小和最大模拟控制输出可以根据需要克隆到VCO。因此，VCO校准程序包括将VCO切换到由固定电容器组设置的每个范围，并且使用复制电荷泵将VCO驱动到每个范围设置的最小和最大频率。最小最大频率数据存储在查找表中，并且可以通过关于哪个固定电容器范围选择将是最佳的先验信息来支持切换到新的信道频率的操作请求。操作点控制器包括用于感测工作点的传感器和向可切换的电容器组提供开关输入以改变工作点的控制器。该变化可以根据校准数据确定。

2. 发明授权

US06888413B1 Frequency synthesizer using a VCO having a controllable operating point, and calibration and tuning thereof 有权
标题翻译：使用具有可控工作点的VCO的频率合成器，以及其校准和调谐
公开(公告)号：US06888413B1
公开(公告)日：2005-05-03
申请号：US10731924
申请日：2003-12-09
申请人： Andrew R. Adams , Neil H. Weste , Stephen C. Avery
发明人： Andrew R. Adams , Neil H. Weste , Stephen C. Avery
IPC分类号： H03F1/02 , H03F3/45 , H03F3/72 , H03L7/07 , H03L7/089 , H03L7/099 , H03L7/10 , H03L7/18 , H03L7/185 , H03M1/06 , H03M1/16 , H03M1/44 , H03L7/00
CPC分类号： H03L7/185 , H03F1/0277 , H03F3/45183 , H03F3/45659 , H03F3/72 , H03F2203/45418 , H03F2203/45652 , H03F2203/7203 , H03F2203/7224 , H03J2200/10 , H03L7/07 , H03L7/0891 , H03L7/099 , H03L7/10 , H03L7/18
摘要： A frequency synthesizer, a calibrator thereof, and an operating controller thereof are described. The synthesizer comprises a main charge pump that drives a voltage controlled oscillator (VCO) through a loop filter. The calibrator includes a second, replica charge pump that can also drive the VCO, but is set up to output only its maximum or minimum analog output control voltage. Since the construction and characteristics of the replica charge pump duplicate the main charge pump, the main charge pump's minimum and maximum analog control outputs can be cloned out to the VCO on demand. A VCO calibration procedure therefore includes switching the VCO to each of its ranges set by a bank of fixed capacitors, and using the replica charge pump to drive the VCO to its minimum and maximum frequency for each range setting. The min-max frequency data is stored in a lookup table, and operational requests to switch to a new channel frequency can be supported with a priori information about which fixed-capacitor range selection will be best. The operating point controller includes a sensor to sense the operating point and a controller that provides a switching input to a switchable bank of capacitors to change the operating point. The change can be determined according to calibration data.
摘要翻译：描述了频率合成器，校准器及其操作控制器。合成器包括通过环路滤波器驱动压控振荡器（VCO）的主电荷泵。校准器包括第二个复制电荷泵，也可以驱动VCO，但是其设置为仅输出其最大或最小模拟输出控制电压。由于复制电荷泵的结构和特性与主电荷泵重复，主电荷泵的最小和最大模拟控制输出可以根据需要克隆到VCO。因此，VCO校准程序包括将VCO切换到由固定电容器组设置的每个范围，并且使用复制电荷泵将VCO驱动到每个范围设置的最小和最大频率。最小最大频率数据存储在查找表中，并且可以通过关于哪个固定电容器范围选择将是最佳的先验信息来支持切换到新的信道频率的操作请求。操作点控制器包括用于感测工作点的传感器和向可切换的电容器组提供开关输入以改变工作点的控制器。该变化可以根据校准数据确定。

3. 发明授权

US06686804B1 Frequency synthesizer using a VCO having a controllable operating point, and calibration and tuning thereof 有权
公开(公告)号：US06686804B1
公开(公告)日：2004-02-03
申请号：US10096215
申请日：2002-03-11
申请人： Andrew R. Adams , Neil H. Weste , Stephen C. Avery
发明人： Andrew R. Adams , Neil H. Weste , Stephen C. Avery
IPC分类号： H03L700
CPC分类号： H03L7/10 , H03F1/0277 , H03F3/45183 , H03F3/45659 , H03F3/72 , H03F2203/45418 , H03F2203/45652 , H03F2203/7203 , H03F2203/7224 , H03J2200/10 , H03L7/07 , H03L7/0891 , H03L7/099 , H03L7/18 , H03L7/185
摘要： A frequency synthesizer, a calibrator thereof, and an operating controller thereof are described. The synthesizer comprises a main charge pump that drives a voltage controlled oscillator (VCO) through a loop filter. The calibrator includes a second, replica charge pump that can also drive the VCO, but is set up to output only its maximum or minimum analog output control voltage. Since the construction and characteristics of the replica charge pump duplicate the main charge pump, the main charge pump's minimum and maximum analog control outputs can be cloned out to the VCO on demand. A VCO calibration procedure therefore includes switching the VCO to each of its ranges set by a bank of fixed capacitors, and using the replica charge pump to drive the VCO to its minimum and maximum frequency for each range setting. The min-max frequency data is stored in a lookup table, and operational requests to switch to a new channel frequency can be supported with a priori information about which fixed-capacitor range selection will be best. The operating point controller includes a sensor to sense the operating point and a controller that provides a switching input to a switchable bank of capacitors to change the operating point. The change can be determined according to calibration data.

4. 发明授权

US06765977B1 Offset mode phase locked loop frequency synthesizer with reduced divide ratio 有权
标题翻译：偏移模式锁相环频率合成器具有降低的分频比
公开(公告)号：US06765977B1
公开(公告)日：2004-07-20
申请号：US10095662
申请日：2002-03-11
申请人： Andrew R. Adams , Stephen C. Avery
发明人： Andrew R. Adams , Stephen C. Avery
IPC分类号： H03D324
CPC分类号： H03L7/07 , H03J2200/10 , H03L7/0891 , H03L7/185
摘要： A phase locked loop (PLL) frequency synthesizer includes a voltage controlled oscillator (VCO) to provide a VCO frequency signal, a frequency offset circuit including a mixer accepting the VCO frequency signal and a signal from a second oscillator to produce a shifted-frequency signal having a frequency significantly lower than the VCO output frequency, a programmable divider accepting the shifted-frequency signal and dividing the frequency of the shifted-frequency signal by a settable amount, a phase detector to compare the phase of the output of the programmable divider to that of a reference oscillator and produce a phase difference signal; and a loop filter to filter a function of the phase difference to produce a control input to the VCO. The offset circuit shifts down the frequency without increasing the divide ratio of the loop as would a prescaler achieving the same frequency conversion as the frequency offset circuit.
摘要翻译：锁相环（PLL）频率合成器包括用于提供VCO频率信号的压控振荡器（VCO），包括接收VCO频率信号的混频器和来自第二振荡器的信号的频率偏移电路，以产生移位频率信号具有显着低于VCO输出频率的频率，可编程分频器接受偏移频率信号并将移频频率信号的频率除以可设置的量;相位检测器，用于将可编程分频器的输出的相位与参考振荡器产生相位差信号; 以及环路滤波器来滤除相位差的函数以产生到VCO的控制输入。偏移电路在不增加环路的分频比的情况下降低频率，而预分频器将实现与频率偏移电路相同的频率转换。

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