公开(公告)号：US07601940B2

公开(公告)日：2009-10-13

申请号：US11690019

申请日：2007-03-22

申请人： Gim Eng Chew ,  Aik Yean Tang ,  Mei Yee Ng

发明人： Gim Eng Chew ,  Aik Yean Tang ,  Mei Yee Ng

IPC分类号： H03G3/20 ,  G01J1/44 ,  H03F3/08

CPC分类号： H03G3/3084

摘要： An optical receiver having a photodetector, a variable gain amplifier, and a gain control circuit is disclosed. The photodetector generates a photodetector output signal related to an intensity of light received by the photodetector, the photodetector output signal being characterized by a peak-to-peak signal value. The variable gain amplifier amplifies the photodetector output signal to generate a receiver output signal that is coupled to an external device, the variable gain amplifier having a gain that is determined by a gain control signal. The gain control circuit receives the receiver output signal and generates the gain control signal therefrom. The gain control signal causes the gain of the variable gain amplifier to decrease as a function of the peak-to-peak signal value to reduce changes in the output signal amplitude as a function of the input light signal amplitude.

摘要翻译： 公开了一种具有光电检测器，可变增益放大器和增益控制电路的光接收器。 光电检测器产生与由光电检测器接收的光的强度相关的光电检测器输出信号，光电检测器输出信号的特征在于峰 - 峰信号值。 可变增益放大器放大光电检测器输出信号以产生耦合到外部设备的接收机输出信号，该可变增益放大器具有由增益控制信号确定的增益。 增益控制电路接收接收机输出信号并从其生成增益控制信号。 增益控制信号使得可变增益放大器的增益作为峰 - 峰信号值的函数而减小，以减小作为输入光信号幅度的函数的输出信号幅度的变化。

公开(公告)号：US20080230684A1

公开(公告)日：2008-09-25

申请号：US11690019

申请日：2007-03-22

申请人： Gim Eng Chew ,  Aik Yean Tang ,  Mei Yee Ng

发明人： Gim Eng Chew ,  Aik Yean Tang ,  Mei Yee Ng

IPC分类号： H03G3/20

CPC分类号： H03G3/3084

摘要： An optical receiver having a photodetector, a variable gain amplifier, and a gain control circuit is disclosed. The photodetector generates a photodetector output signal related to an intensity of light received by the photodetector, the photodetector output signal being characterized by a peak-to-peak signal value. The variable gain amplifier amplifies the photodetector output signal to generate a receiver output signal that is coupled to an external device, the variable gain amplifier having a gain that is determined by a gain control signal. The gain control circuit receives the receiver output signal and generates the gain control signal therefrom. The gain control signal causes the gain of the variable gain amplifier to decrease as a function of the peak-to-peak signal value to reduce changes in the output signal amplitude as a function of the input light signal amplitude.

摘要翻译： 公开了一种具有光电检测器，可变增益放大器和增益控制电路的光接收器。 光电检测器产生与由光电检测器接收的光的强度相关的光电检测器输出信号，光电检测器输出信号的特征在于峰 - 峰信号值。 可变增益放大器放大光电检测器输出信号以产生耦合到外部设备的接收机输出信号，该可变增益放大器具有由增益控制信号确定的增益。 增益控制电路接收接收机输出信号并从其生成增益控制信号。 增益控制信号使得可变增益放大器的增益作为峰 - 峰信号值的函数而减小，以减小作为输入光信号幅度的函数的输出信号幅度的变化。

公开(公告)号：US20100252719A1

公开(公告)日：2010-10-07

申请号：US12727980

申请日：2010-03-19

申请人： Chung Min Thor ,  Mei Yee Ng ,  Gim Eng Chew

发明人： Chung Min Thor ,  Mei Yee Ng ,  Gim Eng Chew

IPC分类号： G01D5/34 ,  H03G3/20

CPC分类号： G01D5/24476 ,  G01D5/34707

摘要： According to one embodiment, there is provided a device and method for correcting code wheel misalignment which employs upper and lower code wheel misalignment photodetectors positioned above and below at least first and second motion detection photodetectors. According to other embodiments, there are provided a device and method for automatically setting the gain of an output circuit in an optical encoder. Still further embodiments of optical encoders combine the code wheel misalignment and automatic gain control features of the invention.

摘要翻译： 根据一个实施例，提供了一种用于校正码盘未对准的装置和方法，其采用位于至少第一和第二运动检测光电检测器上方和下方的上和下码轮未对准光电检测器。 根据其他实施例，提供了一种用于自动设置光学编码器中的输出电路的增益的装置和方法。 光学编码器的另外的实施例组合了本发明的码盘未对准和自动增益控制特征。

公开(公告)号：US08035074B2

公开(公告)日：2011-10-11

申请号：US12368299

申请日：2009-02-09

申请人： Chung Min Thor ,  Mei Yee Ng ,  Gim Eng Chew

发明人： Chung Min Thor ,  Mei Yee Ng ,  Gim Eng Chew

IPC分类号： H03G3/20 ,  G01D5/34

CPC分类号： G01D21/00 ,  G01D1/00 ,  G01D15/00 ,  H03G3/30

摘要： Disclosed are various embodiments of pulse generation and automatic gain control (“AGC”) circuits and corresponding methods that are especially well suited for use in motion encoding systems. Analog output signals provided by a motion encoder serve as inputs to the pulse generation circuit, where peaks, valleys and/or crosspoints corresponding to such analog signals are first detected and then employed to generate output pulses corresponding thereto. These output pulses are next provided to an AGC circuit as self-generated clock signals which control the time windows over which the analog signals of the motion encoder are sampled and processed by the AGC circuit so as to adjust the gains applied to such analog signals.

摘要翻译： 公开了特别适用于运动编码系统的脉冲发生和自动增益控制（“AGC”）电路和相应方法的各种实施例。 由运动编码器提供的模拟输出信号用作脉冲发生电路的输入，其中首先检测对应于这种模拟信号的峰值，谷值和/或交叉点，然后用于产生与之对应的输出脉冲。 这些输出脉冲随后作为自动生成的时钟信号提供给AGC电路，该时钟信号控制由AGC电路对运动编码器的模拟信号进行采样和处理的时间窗口，以调整应用于这种模拟信号的增益。

公开(公告)号：US07709784B2

公开(公告)日：2010-05-04

申请号：US12112962

申请日：2008-04-30

申请人： Chung Min Thor ,  Mei Yee Ng ,  Gim Eng Chew

发明人： Chung Min Thor ,  Mei Yee Ng ,  Gim Eng Chew

IPC分类号： G01D5/34

CPC分类号： G01D5/24476 ,  G01D5/34707

摘要： According to one embodiment, there is provided a device and method for correcting code wheel misalignment which employs upper and lower code wheel misalignment photodetectors positioned above and below at least first and second motion detection photodetectors. According to other embodiments, there are provided a device and method for automatically setting the gain of an output circuit in an optical encoder. Still further embodiments of optical encoders combine the code wheel misalignment and automatic gain control features of the invention.

摘要翻译： 根据一个实施例，提供了一种用于校正码盘未对准的装置和方法，其采用位于至少第一和第二运动检测光电检测器上方和下方的上和下码轮未对准光电检测器。 根据其他实施例，提供了一种用于自动设置光学编码器中的输出电路的增益的装置和方法。 光学编码器的另外的实施例组合了本发明的码盘未对准和自动增益控制特征。

公开(公告)号：US20100213997A1

公开(公告)日：2010-08-26

申请号：US12393162

申请日：2009-02-26

申请人： Mei Yee Ng ,  Gim Eng Chew

发明人： Mei Yee Ng ,  Gim Eng Chew

IPC分类号： H03K12/00

CPC分类号： H03K5/156 ,  H03K5/1252 ,  H03K2005/00052

摘要： Disclosed are various embodiments of interpolation circuits for use in conjunction with motion encoders. The analog output signals provided by incremental or absolute motion encoders are provided to an interpolation circuit, which is capable of providing high interpolation factor output signals having high timing accuracy. Problems with noise spikes common to zero-hysteresis comparators typically employed in interpolation circuits are eliminated, as are problems with time delays differing between comparators that do feature hysteresis. The disclosed interpolation circuits may be implemented using CMOS processes without undue effort.

摘要翻译： 公开了与运动编码器一起使用的内插电路的各种实施例。 由增量或绝对运动编码器提供的模拟输出信号被提供给能够提供高定时精度的高内插因子输出信号的内插电路。 消除了通常在内插电路中使用的零滞后比较器共同的噪声尖峰的问题，因为具有滞后特性的比较器之间的时间延迟不同。 所公开的内插电路可以使用CMOS工艺而不用过度的努力来实现。

公开(公告)号：US20100201422A1

公开(公告)日：2010-08-12

申请号：US12368299

申请日：2009-02-09

申请人： Chung Min Thor ,  Mei Yee Ng ,  Gim Eng Chew

发明人： Chung Min Thor ,  Mei Yee Ng ,  Gim Eng Chew

IPC分类号： H03L5/00

CPC分类号： G01D21/00 ,  G01D1/00 ,  G01D15/00 ,  H03G3/30

摘要： Disclosed are various embodiments of pulse generation and automatic gain control (“AGC”) circuits and corresponding methods that are especially well suited for use in motion encoding systems. Analog output signals provided by a motion encoder serve as inputs to the pulse generation circuit, where peaks, valleys and/or crosspoints corresponding to such analog signals are first detected and then employed to generate output pulses corresponding thereto. These output pulses are next provided to an AGC circuit as self-generated clock signals which control the time windows over which the analog signals of the motion encoder are sampled and processed by the AGC circuit so as to adjust the gains applied to such analog signals.

摘要翻译： 公开了特别适用于运动编码系统的脉冲发生和自动增益控制（“AGC”）电路和相应方法的各种实施例。 由运动编码器提供的模拟输出信号用作脉冲发生电路的输入，其中首先检测对应于这种模拟信号的峰值，谷值和/或交叉点，然后用于产生与之对应的输出脉冲。 这些输出脉冲随后作为自动生成的时钟信号提供给AGC电路，该时钟信号控制由AGC电路对运动编码器的模拟信号进行采样和处理的时间窗口，以调整应用于这种模拟信号的增益。

公开(公告)号：US07977623B2

公开(公告)日：2011-07-12

申请号：US12727980

申请日：2010-03-19

申请人： Chung Min Thor ,  Mei Yee Ng ,  Gim Eng Chew

发明人： Chung Min Thor ,  Mei Yee Ng ,  Gim Eng Chew

IPC分类号： G01D5/34

CPC分类号： G01D5/24476 ,  G01D5/34707

摘要： According to one embodiment, there is provided a device and method for correcting code wheel misalignment which employs upper and lower code wheel misalignment photodetectors positioned above and below at least first and second motion detection photodetectors. According to other embodiments, there are provided a device and method for automatically setting the gain of an output circuit in an optical encoder. Still further embodiments of optical encoders combine the code wheel misalignment and automatic gain control features of the invention.

摘要翻译： 根据一个实施例，提供了一种用于校正码盘未对准的装置和方法，其采用位于至少第一和第二运动检测光电检测器上方和下方的上和下码轮未对准光电检测器。 根据其他实施例，提供了一种用于自动设置光学编码器中的输出电路的增益的装置和方法。 光学编码器的另外的实施例组合了本发明的码盘未对准和自动增益控制特征。

公开(公告)号：US07880657B2

公开(公告)日：2011-02-01

申请号：US12393162

申请日：2009-02-26

申请人： Mei Yee Ng ,  Gim Eng Chew

发明人： Mei Yee Ng ,  Gim Eng Chew

IPC分类号： H03M1/12

CPC分类号： H03K5/156 ,  H03K5/1252 ,  H03K2005/00052

摘要： Disclosed are various embodiments of interpolation circuits for use in conjunction with motion encoders. The analog output signals provided by incremental or absolute motion encoders are provided to an interpolation circuit, which is capable of providing high interpolation factor output signals having high timing accuracy. Problems with noise spikes common to zero-hysteresis comparators typically employed in interpolation circuits are eliminated, as are problems with time delays differing between comparators that do feature hysteresis. The disclosed interpolation circuits may be implemented using CMOS processes without undue effort.

摘要翻译： 公开了与运动编码器一起使用的内插电路的各种实施例。 由增量或绝对运动编码器提供的模拟输出信号被提供给能够提供高定时精度的高内插因子输出信号的内插电路。 消除了通常在内插电路中使用的零滞后比较器共同的噪声尖峰的问题，因为具有滞后特性的比较器之间的时间延迟不同。 所公开的内插电路可以使用CMOS工艺而不用过度的努力来实现。

公开(公告)号：US20090272885A1

公开(公告)日：2009-11-05

申请号：US12112962

申请日：2008-04-30

申请人： Chung Min Thor ,  Mei Yee Ng ,  Gim Eng Chew

发明人： Chung Min Thor ,  Mei Yee Ng ,  Gim Eng Chew

IPC分类号： G01D5/34

CPC分类号： G01D5/24476 ,  G01D5/34707

摘要： According to one embodiment, there is provided a device and method for correcting code wheel misalignment which employs upper and lower code wheel misalignment photodetectors positioned above and below at least first and second motion detection photodetectors. According to other embodiments, there are provided a device and method for automatically setting the gain of an output circuit in an optical encoder. Still further embodiments of optical encoders combine the code wheel misalignment and automatic gain control features of the invention.

摘要翻译： 根据一个实施例，提供了一种用于校正码盘未对准的装置和方法，其采用位于至少第一和第二运动检测光电检测器上方和下方的上和下码轮未对准光电检测器。 根据其他实施例，提供了一种用于自动设置光学编码器中的输出电路的增益的装置和方法。 光学编码器的另外的实施例组合了本发明的码盘未对准和自动增益控制特征。