公开(公告)号：US06292066B1

公开(公告)日：2001-09-18

申请号：US09462564

申请日：2000-06-05

申请人： Shuji Shibuya ,  Hisato Takeuchi ,  Junichi Matsuura ,  Yuichi Tateyama ,  Takaharu Saeki

发明人： Shuji Shibuya ,  Hisato Takeuchi ,  Junichi Matsuura ,  Yuichi Tateyama ,  Takaharu Saeki

IPC分类号： H03L102

CPC分类号： G06G7/26 ,  H03B5/362 ,  H03B5/368 ,  H03B2201/0208 ,  H03L1/022 ,  H03L1/025 ,  H03L1/026 ,  H03L1/028

摘要： A temperature compensating crystal oscillation device includes a constant voltage circuit (12) for outputting a predetermined voltage independent of the ambient temperature, a temperature sensor circuit (13) for outputting a voltage in proportion to the ambient temperature, and a control circuit (14) for receiving the constant voltage output from the constant voltage circuit (12) and the voltage output in proportion to the temperature from the temperature sensor circuit (13) and for generating a control voltage (Vc) used for compensating a temperature characteristic of a quartz oscillator in the entire range of the ambient temperature through polygonal lines approximation of a negative cubic curve by using continuous lines. Furthermore, the crystal oscillation device includes a VCXO (15) whose oscillation frequency is controlled to be a predetermined value by the control voltage (Vc), and a ROM/RAM circuit (16) for storing temperature compensating parameters used for compensation of a temperature characteristic of the control voltage (Vc) for optimizing the oscillation frequency of the VCXO (15).

摘要翻译： 温度补偿晶体振荡装置包括用于输出与环境温度无关的预定电压的恒压电路（12），用于输出与环境温度成比例的电压的温度传感器电路（13），以及控制电路（14） 用于接收来自恒压电路（12）的恒定电压输出和与温度传感器电路（13）的温度成比例的电压输出，并产生用于补偿石英振荡器（13）的温度特性的控制电压（Vc） 在环境温度的整个范围内通过使用连续线的负三次曲线的折线近似。 此外，晶体振荡装置包括通过控制电压（Vc）将振荡频率控制为规定值的VCXO（15），以及用于存储用于补偿温度的温度补偿参数的ROM / RAM电路（16） 用于优化VCXO（15）的振荡频率的控制电压（Vc）的特性。

公开(公告)号：US06211743B1

公开(公告)日：2001-04-03

申请号：US09314898

申请日：1999-05-19

申请人： Woogeun Rhee ,  Akbar Ali ,  Matteo Conta

发明人： Woogeun Rhee ,  Akbar Ali ,  Matteo Conta

IPC分类号： H03L102

CPC分类号： H03L7/099 ,  H03L1/02 ,  H03L7/0891 ,  H03L7/093

摘要： A phase-locked loop includes a phase/frequency detector, a charge pump, a loop filter, an oscillator and a feedback circuit coupled between the oscillator and the phase/frequency detector. The loop filter includes a first temperature-variable well resistor and has a gain directly related to resistance of the first resistor. An oscillator coupled to the loop filter includes a voltage-to-current converter that generates a reference current based on the loop filter voltage, and a current-controlled oscillator that generates the output clock based on the value of the reference current. The voltage-to-current converter includes a first transistor that receives the loop filter voltage at a gate and a second temperature-variable well resistor coupled to the source of the first transistor. The oscillator gain is indirectly related to the resistance of the second resistor. The second well resistor and first well resistor have substantially equal resistances and substantially equal temperature coefficients. Since the loop bandwidth includes the product of the loop filter gain and oscillator gain, the effect of temperature-induced resistance variations on loop bandwidth is minimized.

摘要翻译： 锁相环包括相位/频率检测器，电荷泵，环路滤波器，振荡器和耦合在振荡器和相位/频率检测器之间的反馈电路。 环路滤波器包括第一温度可变阱电阻器，并具有与第一电阻器的电阻直接相关的增益。 耦合到环路滤波器的振荡器包括基于环路滤波器电压产生参考电流的电压 - 电流转换器，以及基于参考电流的值产生输出时钟的电流控制振荡器。 电压 - 电流转换器包括接收栅极处的环路滤波器电压的第一晶体管和耦合到第一晶体管源极的第二温度可变阱电阻器。 振荡器增益与第二个电阻的电阻间接相关。 第二阱电阻器和第一阱电阻器具有基本相等的电阻和基本相等的温度系数。 由于环路带宽包括环路滤波器增益和振荡器增益的乘积，因此温度感应电阻变化对环路带宽的影响最小化。

公开(公告)号：US06433596B1

公开(公告)日：2002-08-13

申请号：US09346521

申请日：1999-07-02

申请人： Peter R. Bossard

发明人： Peter R. Bossard

IPC分类号： H03L102

CPC分类号： H03L7/107 ,  H03L7/0891 ,  H03L7/18

摘要： An improved loop filter device for use in a phase lock loop that improves lock-in time and cycle-to-cycle jitter in the phase lock loop. The loop filter is used in a phase lock loop circuit having a phase frequency detector, a charge pump, a voltage controlled oscillator and a divider. The loop filter has a first capacitor with a first side and a second side, wherein the first side of the first capacitor is coupled to the output of the charge pump and the input of the voltage controlled oscillator. A CMOS switch is coupled to the second side of the first capacitor, wherein the CMOS switch is selectively operable between an open condition and a closed condition. At least one second capacitor is coupled in parallel with said switch, wherein the first capacitor is joined in series with said at least one second capacitor when the CMOS switch is in its open condition.

摘要翻译： 一种用于锁相环的改进的环路滤波器装置，其改善了锁相环中的锁定时间和周期到周期的抖动。 环路滤波器用于具有相位频率检测器，电荷泵，压控振荡器和分频器的锁相环电路中。 环路滤波器具有第一电容器，其具有第一侧面和第二侧面，其中第一电容器的第一侧耦合到电荷泵的输出端和压控振荡器的输入端。 CMOS开关耦合到第一电容器的第二侧，其中CMOS开关选择性地在打开状态和闭合状态之间工作。 至少一个第二电容器与所述开关并联耦合，其中当CMOS开关处于其开启状态时，第一电容器与所述至少一个第二电容器串联连接。

公开(公告)号：US06420938B1

公开(公告)日：2002-07-16

申请号：US09651829

申请日：2000-08-30

申请人： Lawrence Hoff ,  David Buck

发明人： Lawrence Hoff ,  David Buck

IPC分类号： H03L102

CPC分类号： H03L1/022 ,  H03L1/028

摘要： A software controlled crystal oscillator employing a method for digitally controlling a reference frequency of an oscillator, the method includes the steps of: locking a first signal produced by a first tunable software oscillator on to a first resonant frequency of a temperature sensing resonator; locking a second signal produced by a second tunable software oscillator on to a second resonant frequency of the temperature sensing resonator; estimating a temperature of the temperature sensing resonator using the first signal and the second signal; estimating the first resonant frequency and the second resonant frequency based upon the temperature; and adjusting the first signal to approximate the estimated first resonant frequency. An additional step includes controlling the reference frequency of the oscillator based upon the first signal such that the reference frequency is compensated for temperature.

摘要翻译： 一种采用数字控制振荡器参考频率的方法的软件控制晶体振荡器，该方法包括以下步骤：将由第一可调谐软件振荡器产生的第一信号锁定到温度感测谐振器的第一谐振频率; 将由第二可调软件振荡器产生的第二信号锁定到温度感测谐振器的第二谐振频率上; 使用第一信号和第二信号估计温度感测谐振器的温度; 基于温度估计第一谐振频率和第二谐振频率; 以及调整所述第一信号以近似估计的第一谐振频率。 附加步骤包括基于第一信号来控制振荡器的参考频率，使得参考频率被补偿温度。

公开(公告)号：US06348842B1

公开(公告)日：2002-02-19

申请号：US09696564

申请日：2000-10-25

申请人： Aditya Raina ,  Peter J. Holzmann ,  Geoffrey B. Jackson ,  Saleel V. Awsare

发明人： Aditya Raina ,  Peter J. Holzmann ,  Geoffrey B. Jackson ,  Saleel V. Awsare

IPC分类号： H03L102

CPC分类号： H04B1/0003 ,  H03B5/04 ,  H03K3/0231 ,  H03L1/026 ,  H04B1/40

摘要： An apparatus and method for achieving accurate temperature-invariant sampling frequencies in a device, such as, a multiple message non-volatile multilevel analog signal recording and playback system is described. An oscillator is used to generate an oscillation frequency. A bandgap voltage generator generates a zero temperature coefficient voltage reference (V(OTC)) that is independent of temperature. This V(OTC) is applied to the oscillator. A variable temperature coefficient voltage (V(TC)) that compensates for temperature coefficient variations of a resistor to which V(TC) is applied produces a stable oscillator current Iosc. Therefore, the stable oscillator current Iosc is likewise independent of the temperature coefficient variations of the resistor. The stable oscillator current Iosc is applied to the oscillator such that the oscillator generates a stable temperature-invariant oscillation frequency. A digital divider is used to digitally divide the stable oscillation frequency by a predetermined amount to produce an accurate temperature-invariant sampling frequency. A filter is then used to filter incoming signals utilizing a filter cutoff that tracks the sampling frequency.

摘要翻译： 描述了一种用于在诸如多消息非易失性多电平模拟信号记录和回放系统的装置中实现精确的温度不变采样频率的装置和方法。 振荡器用于产生振荡频率。 带隙电压发生器产生与温度无关的零温度系数电压基准（V（OTC））。 该V（OTC）应用于振荡器。 补偿施加V（TC）的电阻器的温度系数变化的可变温度系数电压（V（TC））产生稳定的振荡器电流Iosc。 因此，稳定的振荡器电流Iosc同样独立于电阻器的温度系数变化。 稳定振荡器电流Iosc被​​施加到振荡器，使得振荡器产生稳定的温度不变振荡频率。 使用数字分频器将稳定振荡频率数字地分频预定量以产生精确的温度不变采样频率。 然后使用滤波器来利用跟踪采样频率的滤波器截止来滤波输入信号。

公开(公告)号：US06271736B1

公开(公告)日：2001-08-07

申请号：US09472322

申请日：1999-12-23

申请人： Seok-Yong Kim

发明人： Seok-Yong Kim

IPC分类号： H03L102

CPC分类号： H03L1/026

摘要： A digital temperature compensating crystal oscillator, and a method for stabilizing the frequency thereof, in which not only the vibration phenomenon caused during the conversion of analog signals to digital signals in spite of a constant ambient temperature is decreased, but also the output frequency vibrations caused by the noises of analog devices are also decreased, thereby improving the stability and the reliability. If an output temperature data of an analog/digital converter is a first sampling data, then the output temperature data of the analog/digital converter is used directly as a temperature code for obtaining a temperature compensating data, to be stored into a memory. If it is not a first sampling data, then the output temperature data of the analog/digital converter are accumulated up to a predetermined number of times, and an average of accumulated values is supplied into the memory as a temperature code for obtaining the temperature compensating data.

摘要翻译： 一种数字温度补偿晶体振荡器及其频率稳定化的方法，其中不仅在模拟信号转换成数字信号而导致的振动现象尽管环境温度恒定，而且还引起了输出频率振动 由于模拟装置的噪声也降低，从而提高了稳定性和可靠性。 如果模拟/数字转换器的输出温度数据是第一采样数据，则模拟/数字转换器的输出温度数据被直接用作用于获得要存储到存储器中的温度补偿数据的温度代码。 如果不是第一采样数据，则模拟/数字转换器的输出温度数据被累加到预定次数，并且累加值的平均值作为用于获得温度补偿的温度代码提供到存储器 数据。