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    • 4. 发明申请
    • Fast-settling digital automatic gain control
    • 快速建立数字自动增益控制
    • US20070139118A1
    • 2007-06-21
    • US11312089
    • 2005-12-20
    • Chee TeoLian-Chun XuKok-Soon YeoJohn AsuncionWai Tai
    • Chee TeoLian-Chun XuKok-Soon YeoJohn AsuncionWai Tai
    • H03G3/10
    • H03G3/001H03G1/0088
    • 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.
    • 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。
    • 6. 发明申请
    • Electrostatic discharge protection circuit and method
    • 静电放电保护电路及方法
    • US20060291114A1
    • 2006-12-28
    • US11166176
    • 2005-06-27
    • Chee TeoJohn AsuncionKok YeoLian XuWal Tai
    • Chee TeoJohn AsuncionKok YeoLian XuWal Tai
    • H02H9/00
    • H03F1/08H01L27/0251H03F1/52H03F3/08H03F3/345
    • A circuit that protects against electrostatic discharge and electrical over stress is provided. The circuit includes a first transistor including a substrate. An internal predetermined voltage source biases the substrate of the first transistor. The internal predetermined voltage source is greater than or equal to a source voltage provided to a source of the first transistor and isolates a substrate voltage of the first transistor from a supply voltage of the circuit. A first resistor is coupled to a gate of the first transistor and ground. The circuit also includes a zener diode coupled between ground and the supply voltage of the circuit. The zener diode shorts to ground if the supply voltage of the circuit exceeds the breakdown voltage of the zener diode.
    • 提供了防止静电放电和电应力过大的电路。 电路包括包括衬底的第一晶体管。 内部预定电压源偏置第一晶体管的衬底。 内部预定电压源大于或等于提供给第一晶体管的源极的源极电压,并将第一晶体管的衬底电压与电路的电源电压隔离开来。 第一电阻器耦合到第一晶体管的栅极并接地。 该电路还包括耦合在地之间的齐纳二极管和电路的电源电压。 如果电路的电源电压超过齐纳二极管的击穿电压,则齐纳二极管接地。
    • 8. 发明申请
    • Variable noise control for an optical transducer
    • 用于光学传感器的可变噪声控制
    • US20060081779A1
    • 2006-04-20
    • US10968564
    • 2004-10-18
    • Kok-Soon YeoLian-Chun XuChee-Keong TeoJohn Asuncion
    • Kok-Soon YeoLian-Chun XuChee-Keong TeoJohn Asuncion
    • G01J5/00
    • H04B10/58
    • 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.
    • 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。