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1. 发明授权

US09661695B1 Low-headroom constant current source for high-current applications 有权
公开(公告)号：US09661695B1
公开(公告)日：2017-05-23
申请号：US14939081
申请日：2015-11-12
申请人： Hong Kong Applied Science & Technology Research Institute Company Limited
发明人： Guangjie Cai , Ho Ming (Karen) Wan , Chun Fai Wong , Tai Yin Wong
IPC分类号： H03F3/04 , H03F3/30 , H05B33/08 , H03K17/687 , H03F3/45
CPC分类号： H05B33/0806 , H03F3/345 , H03F3/45179 , H03F2200/462 , H03F2200/471 , H03F2200/474 , H03F2200/91 , H03K17/6872 , H05B33/0827 , H05B33/0842
摘要： A low-headroom current driver does not use an op amp or resistor. A sensing transistor having its source connected to a drain of an output transistor senses variations in an output current. The gate, source, and drain voltages of the sensing transistor are mirrored to a sense mirror transistor to control a sense current. The sense current is mirrored to a reference source transistor to generate a mirrored sense current. An error between the mirrored sense current and a fixed reference current is stored as charge on an error-storing capacitor. The stored error charge creates a negative-feedback compensation current that adjusts a gate voltage generated by a feedback-driving transistor. The adjusted gate voltage controls the gate of the output transistor to compensate for the sensed variation in output current. The sensing current is also compensated using a sense-mirror tail transistor connected to the sense mirror transistor.

2. 发明授权

US08711982B1 Amplitude-shift-keying (ASK) envelope detector and demodulation circuits 有权
标题翻译：幅移键控（ASK）包络检波器和解调电路
公开(公告)号：US08711982B1
公开(公告)日：2014-04-29
申请号：US13790951
申请日：2013-03-08
申请人： Hong Kong Applied Science & Technology Research Institute Company Limited
发明人： Guangjie Cai , Leung Ling (Alan) Pun , Tat Fu Chan
IPC分类号： H03D1/24 , H03D1/00
CPC分类号： H03D1/18
摘要： An envelope detector receives an input that is an Amplitude-Modulated (AM) or Amplitude-Shift-Keying (ASK) coded signal. Each channel has a sample switch and a diode that charge an internal sampling capacitor. A hold switch connects the internal sampling capacitor to a summing output capacitor or to a post-processing circuit. A reset switch discharges the internal sampling capacitor after each sample. Two or more channels may be time multiplexed to sample alternate cycles of the input, and then their outputs combined by the summing output capacitor or by the post-processing circuit. The diodes may be reversed to detect the negative envelope rather than the positive envelope. Clocks for the switches may be generated from the input, or may be from a separate clock source. Since the sampling window is open for a whole input cycle, the clock source is insensitive to phase error.
摘要翻译：包络检测器接收作为幅度调制（AM）或幅移键控（ASK）编码信号的输入。每个通道都有一个采样开关和一个对内部采样电容充电的二极管。保持开关将内部采样电容器连接到求和输出电容器或后处理电路。每个样品后，复位开关对内部采样电容放电。两个或多个通道可以被时间复用以对输入的交替周期进行采样，然后它们的输出由加法输出电容器或后处理电路组合。二极管可以反向以检测负信封而不是正信封。用于开关的时钟可以从输入产生，或者可以来自单独的时钟源。由于采样窗口为整个输入周期打开，因此时钟源对相位误差不敏感。

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