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1. 发明授权

US07215151B2 Multi-stage light emitting diode driver circuit 失效
标题翻译：多级发光二极管驱动电路
公开(公告)号：US07215151B2
公开(公告)日：2007-05-08
申请号：US11186753
申请日：2005-07-22
申请人： Wai Keat Tai , Kok-Soon Yeo , Chee-Keong Teo , John J. De Leon Asuncion , Lian-Chun Xu
发明人： Wai Keat Tai , Kok-Soon Yeo , Chee-Keong Teo , John J. De Leon Asuncion , Lian-Chun Xu
IPC分类号： H03K19/094 , G09G3/32
CPC分类号： H03K19/00315 , H03K19/0013
摘要： A multi-stage light emitting diode (LED) driver circuit is provided. The circuit includes a driver transistor coupled to an LED. The LED is coupled at a drain of the driver transistor and the driver transistor drives current to the LED. A first transistor stack is coupled between a gate of the driver transistor and ground. A first inverter stage is coupled to a common gate of the first transistor stack. The first inverter stage is further coupled between a high voltage source and ground. A second inverter stage is coupled to a common gate of the first inverter stage. The second inverter stage is further coupled between the high voltage source and ground. The circuit further includes a first transistor coupled between the high voltage source and gate of the driver transistor. The gate of the transistor is coupled to the first inverter stage.
摘要翻译：提供了一种多级发光二极管（LED）驱动电路。电路包括耦合到LED的驱动晶体管。 LED耦合在驱动晶体管的漏极处，驱动晶体管驱动电流至LED。第一晶体管堆叠耦合在驱动晶体管的栅极和地之间。第一反相器级耦合到第一晶体管堆叠的公共栅极。第一逆变器级进一步耦合在高电压源和地之间。第二逆变器级耦合到第一逆变器级的公共栅极。第二反相器级进一步耦合在高电压源和地之间。电路还包括耦合在驱动晶体管的高电压源和栅极之间的第一晶体管。晶体管的栅极耦合到第一反相器级。

2. 发明授权

US07570109B2 System and method for demodulating amplitude modulated signals 失效
标题翻译：用于解调幅度调制信号的系统和方法
公开(公告)号：US07570109B2
公开(公告)日：2009-08-04
申请号：US11266916
申请日：2005-11-04
申请人： Lian-Chun Xu , Kok-Soon Yeo , Chee-Keong Teo , John Julius Asuncion , Wai Keat Tai
发明人： Lian-Chun Xu , Kok-Soon Yeo , Chee-Keong Teo , John Julius Asuncion , Wai Keat Tai
IPC分类号： H04B10/06
CPC分类号： H03D1/18
摘要： A system and method for demodulating amplitude modulated input signals uses two comparators and a charge pump circuit, which is positioned between the two comparators, to produce a demodulated signal of an amplitude modulated input signal. The two comparators and the charge pump circuit form a demodulating unit that may be a part of an infrared remote control receiver. The first comparator converts the input signal from a waveform to a pulse form. The charge pump circuit then converts the pulse signal into an integrated signal in a triangular pulse form. The second comparator converts the integrated signal from a triangular pulse form to a rectangular pulse form to produce the demodulated signal.
摘要翻译：用于解调幅度调制输入信号的系统和方法使用位于两个比较器之间的两个比较器和电荷泵电路，以产生调幅输入信号的解调信号。两个比较器和电荷泵电路形成可以是红外遥控接收器的一部分的解调单元。第一个比较器将输入信号从波形转换为脉冲形式。然后，电荷泵电路将脉冲信号转换为三角形脉冲形式的积分信号。第二比较器将积分信号从三角形脉冲形式转换为矩形脉冲形式以产生解调信号。

3. 发明授权

US07423737B2 Velocity determination utilizing two photosensor arrays 有权
标题翻译：使用两个光电传感器阵列的速度确定
公开(公告)号：US07423737B2
公开(公告)日：2008-09-09
申请号：US11668074
申请日：2007-01-29
申请人： Kuldeep Kumar Saxena , Srinivasan Lakshmanan , Wai Keat Tai
发明人： Kuldeep Kumar Saxena , Srinivasan Lakshmanan , Wai Keat Tai
IPC分类号： G01P3/36
CPC分类号： G01P3/36 , G01P3/68
摘要： A technique for relative velocity determination between a surface and a velocity determination system involves capturing a set of outputs from a first photosensor array and then comparing subsequently captured sets of outputs from a second photosensor array to the set of outputs from the first photosensor array until a satisfactory match is found between the outputs. Once a satisfactory match is found, the elapsed time between the capture of the two sets of outputs represents the time to travel the known separation distance between the two photosensor arrays. Given the known distance of travel and the elapsed time to travel the distance, the relative velocity is a simple calculation of the distance traveled divided by the time to travel the distance.
摘要翻译：用于在表面和速度确定系统之间进行相对速度确定的技术涉及从第一光电传感器阵列捕获一组输出，然后将随后捕获的第二光电传感器阵列的输出集合与来自第一光传感器阵列的输出集合进行比较，直到在输出之间找到令人满意的匹配。一旦找到令人满意的匹配，则捕获两组输出之间的经过时间表示在两个光电传感器阵列之间行进已知间隔距离的时间。给定已知的行驶距离和行驶距离的经过时间，相对速度是行驶距离除以行驶距离的时间的简单计算。

4. 发明授权

US07265626B2 Fast-setting digital automatic gain control 失效
标题翻译：快速设置数字自动增益控制
公开(公告)号：US07265626B2
公开(公告)日：2007-09-04
申请号：US11312089
申请日：2005-12-20
申请人： Chee Keong Teo , Lian-Chun Xu , Kok-Soon Yeo , John Julius Asuncion , Wai Keat Tai
发明人： Chee Keong Teo , Lian-Chun Xu , Kok-Soon Yeo , John Julius Asuncion , Wai Keat Tai
IPC分类号： H03G3/10
CPC分类号： H03G3/001 , H03G1/0088
摘要： A fast-settling digital automatic gain control circuit comprises first and second gain-controllable amplifiers in series. Each amplifier can be digitally switched between minimum and maximum gains by control logic that receives inputs from a multi-level voltage comparator. A peak detector connected to the output of the first gain-controlled amplifier is used to set the overall operating ranges for several threshold detectors. Four reference voltages are generated from the peak detector. The highest reference voltage is used to clock and reset the gain control logic with a hysteresis comparator to the instantaneous input signal from the first gain-controlled amplifier. The three other lower reference voltages are used to provide three-bits of digital input data to the gain control logic. Two digital controls are output, a min/max gain bit for the first gain-controlled amplifier, and a similar min/max gain bit for the second gain-controlled amplifier.
摘要翻译：快速稳定的数字自动增益控制电路包括串联的第一和第二增益可控放大器。每个放大器可以通过从多电平电压比较器接收输入的控制逻辑在最小和最大增益之间进行数字切换。连接到第一增益控制放大器的输出端的峰值检测器用于设置多个阈值检测器的总体工作范围。从峰值检测器产生四个参考电压。最高参考电压用于使用滞后比较器对增益控制逻辑进行时钟并复位为来自第一增益控制放大器的瞬时输入信号。三个较低的参考电压用于向增益控制逻辑提供三位数字输入数据。输出两个数字控制，第一增益控制放大器的最小/最大增益位，以及第二增益控制放大器的类似最小/最大增益位。

5. 发明申请

US20070080741A1 Bandgap reference voltage circuit 有权
标题翻译：带隙参考电压电路
公开(公告)号：US20070080741A1
公开(公告)日：2007-04-12
申请号：US11244840
申请日：2005-10-06
申请人： Kok-Soon Yeo , Wai-Keat Tai
发明人： Kok-Soon Yeo , Wai-Keat Tai
IPC分类号： G05F1/10 , G05F3/02
CPC分类号： G05F3/30
摘要： A reference voltage circuit includes first circuitry that generates a thermal voltage that is approximately proportional to absolute temperature, a first voltage multiplier, second circuitry that generates an inverse thermal voltage that is approximately inversely proportional to absolute temperature, a second voltage multiplier and a summer. The first voltage multiplier multiplies the thermal voltage to obtain a first multiplied voltage. The multiplied voltage is not equal to the thermal voltage. The second voltage multiplier multiplies the inverse thermal voltage to obtain a second multiplied voltage. The summer sums the first multiplied voltage with the second multiplied voltage to obtain a reference voltage.
摘要翻译：参考电压电路包括产生大致与绝对温度成比例的热电压的第一电路，第一电压倍增器，产生与绝对温度近似成反比的反向热电压的第二电路，第二电压倍增器和夏季。第一电压倍增器将热电压倍增以获得第一倍增电压。倍增电压不等于热电压。第二电压倍增器乘以逆热电压以获得第二倍增电压。夏季将第一个乘法电压与第二个相乘电压相加，以获得参考电压。

6. 发明授权

US07187223B2 Comparator with hysteresis 有权
标题翻译：具有迟滞的比较器
公开(公告)号：US07187223B2
公开(公告)日：2007-03-06
申请号：US11057244
申请日：2005-02-14
申请人： Kok-Soon Yeo , Lian-Chun Xu , Chee-Keong Teo , John Julius de Leon Asuncion , Wai-Keat Tai
发明人： Kok-Soon Yeo , Lian-Chun Xu , Chee-Keong Teo , John Julius de Leon Asuncion , Wai-Keat Tai
IPC分类号： H03K3/00
CPC分类号： H03K5/2481 , H03K3/02337 , H03K3/3565
摘要： In one embodiment, a comparator is provided with a first differential input stage that receives an input voltage and a reference voltage and produces a first differential output, and a second differential input stage that has differential inputs and produces a second differential output. A comparator stage produces a comparator output in response to the first and second differential outputs. The comparator also has a hysteresis control circuit, the components of which include 1) a resistor and a hysteresis regulating voltage input, coupled between the differential inputs of the second differential input stage, 2) first and second current generators, and 3) at least one switch, under control of the comparator output, to alternately enable different combinations of the first and second current generators, thereby inducing a first or a second current through the resistor.
摘要翻译：在一个实施例中，比较器具有接收输入电压和参考电压并产生第一差分输出的第一差分输入级，以及具有差分输入并产生第二差分输出的第二差分输入级。比较器级响应于第一和第二差分输出产生比较器输出。比较器还具有一个迟滞控制电路，其组件包括1）耦合在第二差分输入级的差分输入之间的电阻器和滞后调节电压输入，2）第一和第二电流发生器，以及3）至少一个开关在比较器输出的控制下交替地使第一和第二电流发生器的组合不同，从而引起通过电阻器的第一或第二电流。

7. 发明授权

US07561812B2 Optical receiver with matched photodetector capacitance 失效
标题翻译：具有匹配光电探测器电容的光接收器
公开(公告)号：US07561812B2
公开(公告)日：2009-07-14
申请号：US11250329
申请日：2005-10-13
申请人： Wai Keat Tai , Kok Soon Yeo , Chee Keong Teo , John Julius Asuncion , Lian Chun Xu
发明人： Wai Keat Tai , Kok Soon Yeo , Chee Keong Teo , John Julius Asuncion , Lian Chun Xu
IPC分类号： H04B10/06
CPC分类号： H04B10/66
摘要： An optical receiver has a voltage supply, a first node, and a second node. A first input of a differential amplifier is coupled to the first node and a second input of the differential amplifier is coupled to the second node. A photodetector is coupled between the voltage supply and the first node, which produces a photodetector capacitance. A programmable variable capacitor having a capacitance selectively matched to the photodetector capacitance is coupled between the voltage supply and the second node.
摘要翻译：光接收器具有电压源，第一节点和第二节点。差分放大器的第一输入耦合到第一节点，并且差分放大器的第二输入端耦合到第二节点。光电检测器耦合在电压源和第一节点之间，其产生光电检测器电容。具有与光电检测器电容有选择性匹配的电容的可编程可变电容器被耦合在电压源和第二节点之间。

8. 发明申请

US20100162054A1 DETECTION OF AND RECOVERY FROM AN ELECTRICAL FAST TRANSIENT/BURST (EFT/B) ON A UNIVERSAL SERIAL BUS (USB) DEVICE 有权
标题翻译：在通用串行总线（USB）设备上检测和恢复电气快速瞬态/爆炸（EFT / B）
公开(公告)号：US20100162054A1
公开(公告)日：2010-06-24
申请号：US12338898
申请日：2008-12-18
申请人： John Julius Asuncion , Wai Keat Tai , Shan Chong Tan , Lian Chun Xu
发明人： John Julius Asuncion , Wai Keat Tai , Shan Chong Tan , Lian Chun Xu
IPC分类号： G06F11/22
CPC分类号： G06F13/4068 , H04L25/085
摘要： An Electrical Fast Transient/Burst (EFT/B) detection and recovery system for a Universal Serial Bus (USB) device. The system includes a USB core and a burst controller. The USB core provides serial communications with a host device through a USB data channel. The burst controller is coupled to the USB core. The burst controller detects an EFT/B event and automatically reconnects the USB core to the host device in response to recognition of a suspend state of the USB core by the host device.
摘要翻译：用于通用串行总线（USB）设备的电快速瞬态/突发（EFT / B）检测和恢复系统。该系统包括USB内核和突发控制器。 USB内核通过USB数据通道与主机设备进行串行通信。突发控制器耦合到USB内核。突发控制器响应于主机设备对USB核心的挂起状态的识别，检测到EFT / B事件并自动将USB内核重新连接到主机设备。

9. 发明授权

US07511567B2 Bandgap reference voltage circuit 有权
标题翻译：带隙参考电压电路
公开(公告)号：US07511567B2
公开(公告)日：2009-03-31
申请号：US11244840
申请日：2005-10-06
申请人： Kok-Soon Yeo , Wai-Keat Tai
发明人： Kok-Soon Yeo , Wai-Keat Tai
IPC分类号： G05F1/10 , G05F3/02
CPC分类号： G05F3/30
摘要： A reference voltage circuit includes first circuitry that generates a thermal voltage that is approximately proportional to absolute temperature, a first voltage multiplier, second circuitry that generates an inverse thermal voltage that is approximately inversely proportional to absolute temperature, a second voltage multiplier and a summer. The first voltage multiplier multiplies the thermal voltage to obtain a first multiplied voltage. The multiplied voltage is not equal to the thermal voltage. The second voltage multiplier multiplies the inverse thermal voltage to obtain a second multiplied voltage. The summer sums the first multiplied voltage with the second multiplied voltage to obtain a reference voltage.
摘要翻译：参考电压电路包括产生大致与绝对温度成比例的热电压的第一电路，第一电压倍增器，产生与绝对温度近似成反比的反向热电压的第二电路，第二电压倍增器和夏季。第一电压倍增器将热电压倍增以获得第一倍增电压。倍增电压不等于热电压。第二电压倍增器乘以逆热电压以获得第二倍增电压。夏季将第一个乘法电压与第二个相乘电压相加，以获得参考电压。

10. 发明申请

US20060181314A1 Comparator with hysteresis 有权
标题翻译：具有迟滞的比较器
公开(公告)号：US20060181314A1
公开(公告)日：2006-08-17
申请号：US11057244
申请日：2005-02-14
申请人： Kok-Soon Yeo , Lian-Chun Xu , Chee-Keong Teo , John Julius de Asuncion , Wai-Keat Tai
发明人： Kok-Soon Yeo , Lian-Chun Xu , Chee-Keong Teo , John Julius de Asuncion , Wai-Keat Tai
IPC分类号： H03K5/22
CPC分类号： H03K5/2481 , H03K3/02337 , H03K3/3565
摘要： In one embodiment, a comparator is provided with a first differential input stage that receives an input voltage and a reference voltage and produces a first differential output, and a second differential input stage that has differential inputs and produces a second differential output. A comparator stage produces a comparator output in response to the first and second differential outputs. The comparator also has a hysteresis control circuit, the components of which include 1) a resistor and a hysteresis regulating voltage input, coupled between the differential inputs of the second differential input stage, 2) first and second current generators, and 3) at least one switch, under control of the comparator output, to alternately enable different combinations of the first and second current generators, thereby inducing a first or a second current through the resistor.
摘要翻译：在一个实施例中，比较器具有接收输入电压和参考电压并产生第一差分输出的第一差分输入级，以及具有差分输入并产生第二差分输出的第二差分输入级。比较器级响应于第一和第二差分输出产生比较器输出。比较器还具有一个迟滞控制电路，其组件包括1）耦合在第二差分输入级的差分输入端之间的电阻器和滞后调节电压输入端，2）第一和第二电流发生器，以及3）至少一个开关在比较器输出的控制下交替地使第一和第二电流发生器的组合不同，从而引起通过电阻器的第一或第二电流。

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