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1. 发明申请

US20070018685A1 Multi-stage light emitting diode driver circuit 失效
公开(公告)号：US20070018685A1
公开(公告)日：2007-01-25
申请号：US11186753
申请日：2005-07-22
申请人： Wai Tai , Kok-Soon Yeo , Chee-Keong Teo , John De Leon Asuncion , Lian-Chun Xu
发明人： Wai Tai , Kok-Soon Yeo , Chee-Keong Teo , John De Leon Asuncion , Lian-Chun Xu
IPC分类号： H03K19/094
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.

2. 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。

3. 发明申请

US20070205826A1 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：US20070205826A1
公开(公告)日：2007-09-06
申请号：US11266916
申请日：2005-11-04
申请人： Lian-Chun Xu , Kok-Soon Yeo , Chee-Keong Teo , John Asuncion , Wai Tai
发明人： Lian-Chun Xu , Kok-Soon Yeo , Chee-Keong Teo , John Asuncion , Wai Tai
IPC分类号： H03D1/00
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。

4. 发明申请

US20070040543A1 Bandgap reference circuit 审中-公开
标题翻译：带隙参考电路
公开(公告)号：US20070040543A1
公开(公告)日：2007-02-22
申请号：US11204352
申请日：2005-08-16
申请人： Kok-Soon Yeo , Lian-Chun Xu , Wai Tai , Chee-Keong Teo , John Asuncion
发明人： Kok-Soon Yeo , Lian-Chun Xu , Wai Tai , Chee-Keong Teo , John Asuncion
IPC分类号： G05F3/16 , G05F3/20
CPC分类号： G05F3/30
摘要： A bandgap circuit includes a current mirror that generates a proportional to absolute temperature current at an output node that outputs the bandgap reference voltage. A first current path including a first resistor is coupled between the output node and a first bipolar transistor. The second current path including a second resistor is coupled between the output node and a second bipolar transistor. The first current path is parallel to the second current path. The circuit outputs a bandgap reference voltage.
摘要翻译：带隙电路包括在输出带隙参考电压的输出节点处产生与绝对温度电流成正比的电流镜。包括第一电阻器的第一电流路径被耦合在输出节点和第一双极晶体管之间。包括第二电阻器的第二电流路径耦合在输出节点和第二双极晶体管之间。第一电流路径平行于第二电流路径。电路输出带隙参考电压。

5. 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。

6. 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。

7. 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。

8. 发明申请

US20060081779A1 Variable noise control for an optical transducer 有权
标题翻译：用于光学传感器的可变噪声控制
公开(公告)号：US20060081779A1
公开(公告)日：2006-04-20
申请号：US10968564
申请日：2004-10-18
申请人： Kok-Soon Yeo , Lian-Chun Xu , Chee-Keong Teo , John Asuncion
发明人： Kok-Soon Yeo , Lian-Chun Xu , Chee-Keong Teo , John Asuncion
IPC分类号： G01J5/00
CPC分类号： H04B10/58
摘要： In one embodiment, an optical transducer, such as an infrared transducer, generates an output signal that is representative of optical irradiance. A noise control circuit is coupled in a power supply path of the optical transducer. A switching circuit varies the noise control provided by the noise control circuit, in response to changes in the output signal of the optical transducer. The noise control may be varied in a number of different ways, including: turning the noise control on or off, varying the noise control in discrete steps, or varying the noise control in a continuous manner. Methods for varying noise control in response to optical irradiance of an optical transducer are also disclosed.
摘要翻译：在一个实施例中，诸如红外换能器的光学换能器产生代表光学辐照度的输出信号。噪声控制电路耦合在光学换能器的电源路径中。响应于光学换能器的输出信号的变化，开关电路改变由噪声控制电路提供的噪声控制。噪声控制可以以多种不同的方式变化，包括：打开或关闭噪声控制，以离散步骤改变噪声控制，或以连续的方式改变噪声控制。还公开了响应于光学换能器的光学辐照而改变噪声控制的方法。

9. 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。

10. 发明授权

US07309852B2 Variable noise control for an optical transducer 有权
标题翻译：用于光学传感器的可变噪声控制
公开(公告)号：US07309852B2
公开(公告)日：2007-12-18
申请号：US10968564
申请日：2004-10-18
申请人： Kok-Soon Yeo , Lian-Chun Xu , Chee-Keong Teo , John Julius De Leon Asuncion
发明人： Kok-Soon Yeo , Lian-Chun Xu , Chee-Keong Teo , John Julius De Leon Asuncion
IPC分类号： G01J5/00 , H01B10/02
CPC分类号： H04B10/58
摘要： In one embodiment, an optical transducer, such as an infrared transducer, generates an output signal that is representative of optical irradiance. A noise control circuit is coupled in a power supply path of the optical transducer. A switching circuit varies the noise control provided by the noise control circuit, in response to changes in the output signal of the optical transducer. The noise control may be varied in a number of different ways, including: turning the noise control on or off, varying the noise control in discrete steps, or varying the noise control in a continuous manner. Methods for varying noise control in response to optical irradiance of an optical transducer are also disclosed.
摘要翻译：在一个实施例中，诸如红外换能器的光学换能器产生代表光学辐照度的输出信号。噪声控制电路耦合在光学换能器的电源路径中。响应于光学换能器的输出信号的变化，开关电路改变由噪声控制电路提供的噪声控制。噪声控制可以以多种不同的方式变化，包括：打开或关闭噪声控制，以离散步骤改变噪声控制，或以连续的方式改变噪声控制。还公开了响应于光学换能器的光学辐照而改变噪声控制的方法。

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