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1. 发明授权

US4510466A Switched capacitor SSB modulator 失效
公开(公告)号：US4510466A
公开(公告)日：1985-04-09
申请号：US392971
申请日：1982-06-28
申请人： Chieh Chang , Man S. Lee
发明人： Chieh Chang , Man S. Lee
IPC分类号： H03C1/62 , H03C1/02 , H03K7/00
CPC分类号： H03C1/62
摘要： An integrated single-sideband modulator comprises six integrated capacitors C1-C6 and first switch means alternately connecting C1 and C2 as feedback capacitors across a differential input operational amplifier A1. The amplifier has a virtual ground potential on its inverting input terminal for causing it to operate as a voltage source and render the circuit relatively insensitive to parasitic capacitance effects associated with capacitor plates. Second switch means cooperates with A1, C1 and C2 and is responsive to 4-phase clock signals for driving input capacitors C3-C6 so as to convert first and second quadrature-phase input signal voltages into first and second electrical charge flow signals on the inverting input terminal that are a function of products of representations of the first and second voltages in switch state time intervals and associated pulse trains which have a 90.degree. phase difference therebetween and a repetitive pattern such as +1, +1, -1, -1, etc. The amplifier and feedback capacitors combine the charge signals for producing a single-sideband signal on A1's output terminal. This circuit is converted to a balanced modulator by omitting C5 and C6. In an alternate embodiment of a single sideband modulator that requires only a pair of switched capacitors C11 and C12, a 4-phase switch means alternately charges C11 and C12 with associated ones of the quadrature-phase input signal voltages while alternately connecting C12 and C11 as feedback capacitors across A1, the polarity of each capacitors feedback voltage being reversed each time that capacitor is connected across the amplifier. This circuit is operated as a balanced modulator by omitting one of the capacitors.

2. 发明授权

US4504804A Switched capacitor balanced modulator/demodulator 失效
标题翻译：开关电容平衡调制器/解调器
公开(公告)号：US4504804A
公开(公告)日：1985-03-12
申请号：US393229
申请日：1982-06-28
申请人： Chieh Chang , Man S. Lee
发明人： Chieh Chang , Man S. Lee
IPC分类号： H03C1/00 , H03C1/02 , H03K7/00
CPC分类号： H03C1/00
摘要： An integrated single-sideband modulator comprises six integrated capacitors C1-C6 and first switch means alternately connecting C1 and C2 as feedback capacitors across a differential input operational amplifier A1. The amplifier has a virtual ground potential on its inverting input terminal for causing it to operate as a voltage source and render the circuit relatively insensitive to parasitic capacitance effects associated with capacitor plates. Second switch means cooperates with A1, C1 and C2 and is responsive to 4-phase clock signals for driving input capacitors C3-C6 so as to convert first and second quadrature-phase input signal voltages into first and second electrical charge flow signals on the inverting input terminal that are a function of products of representations of the first and second voltages in switch state time intervals and associated pulse trains which have a 90.degree. phase difference therebetween and a repetitive pattern such as +1, +1, -1, -1, etc. The amplifier and feedback capacitors combine the charge signals for producing a single-sideband signal on A1's output terminal. This circuit is converted to a balanced modulator by omitting C5 and C6. In an alternate embodiment of a single sidebank modulator that requires only a pair of switched capacitors C11 and C12, a 4-phase switch means alternately charges C11 and C12 with associated ones of the quadrature-phase input signal voltages while alternately connecting C12 and C11 as feedback capacitors across A1, the polarity of each capacitor's feedback voltage being reversed each time that capacitor is connected across the amplifier. This circuit is operated as a balanced modulator by omitting one of the capacitors.
摘要翻译：集成的单边带调制器包括六个集成电容器C1-C6和第一开关装置，交替地将C1和C2作为反馈电容器连接在差分输入运算放大器A1上。放大器在其反相输入端子上具有虚拟接地电位，使其作为电压源工作，并使电路对与电容器板相关的寄生电容效应相对不敏感。第二开关装置与A1，C1和C2配合，并且响应于用于驱动输入电容器C3-C6的4相时钟信号，以便将第一和第二正交相输入信号电压转换成反相的第一和第二电荷流动信号输入端子，其是开关状态时间间隔中的第一和第二电压的表示的乘积的函数，以及在其间具有90°相位差的相关联的脉冲串和诸如+1，+1，-1，-1 等等。放大器和反馈电容器组合了用于在A1输出端子上产生单边带信号的电荷信号。该电路通过省略C5和C6转换为平衡调制器。在仅需要一对开关电容器C11和C12的单个边沿调制器的替代实施例中，4相开关装置交替地对相关的正交相输入信号电压充电C11和C12，同时交替地连接C12和C11作为 A1反馈电容器，每个电容器的反馈电压的极性在每个电容器连接在放大器上时都会反转。该电路通过省略其中一个电容器作为平衡调制器工作。

3. 发明授权

US4504803A Switched capacitor AM modulator/demodulator 失效
标题翻译：开关电容AM调制器/解调器
公开(公告)号：US4504803A
公开(公告)日：1985-03-12
申请号：US393020
申请日：1982-06-28
申请人： Man S. Lee , Chieh Chang
发明人： Man S. Lee , Chieh Chang
IPC分类号： H03C1/00 , H03C1/02 , H03K7/00
CPC分类号： H03C1/00
摘要： A first embodiment of an integrable switched capacitor modulator comprises a differential input operational amplifier A1 having a virtual ground potential impressed on its inverting input terminal; capacitors C1, C2 and C3; and switch means operative for alternately (1) charging C1 with an input voltage while connecting C2 and C3 in series with A1 and across it, respectively, for causing it to produce an inverted version of the input voltage, and (2) discharging C2 and C3 while connecting the sample of the input voltage on C1 across A1 for causing it to output a non-inverted sample of the input voltage. The modulated output signal from A1 is preferrably bandpass filtered to eliminate baseband spectral components fed through A1 when C2 is connected in series with the input terminal thereof. In a second embodiment which is insensitive to feedthrough and which requires only two capacitors C1 and C4, the switch means alternately (1) charges C1 with the input voltage while connecting a prior sample of the input voltage on C4 across A1 for causing it to output an inverted sample of the input voltage, and (2) changes C4 with the input signal while connecting the sample of the input voltage on C1 across A1 in the opposite polarity for causing it to output a non-inverted sample of the input voltage. This embodiment has particular advantage as a demodulator since the built-in sample-and-hold function provides low pass filtering of the output signal of A1.
摘要翻译：可积分开关电容调制器的第一实施例包括具有在其反相输入端施加的虚拟地电势的差分输入运算放大器A1; 电容器C1，C2和C3; 以及开关装置，用于交替地（1）在输入电压C1和C1串联连接C2和C3的同时连续输入电压C1，使其产生反相的输入电压，以及（2）将C2和 C3，同时将A1上的输入电压的采样连接到A1上，使其输出未反相的输入电压。来自A1的调制输出信号优选地被带通滤波以消除当C2与其输入端串联连接时通过A1馈送的基带频谱分量。在对馈通不敏感并且仅需要两个电容器C1和C4的第二实施例中，开关装置交替地（1）将C1与输入电压充电，同时在A1上连接C4上的输入电压的先前采样以使其输出输入电压的反相采样，以及（2）在输入信号的C1反相极性上连接A1上的输入电压的采样，使输出电压输入不反转的样本，改变C4与输入信号。该实施例作为解调器具有特别的优点，因为内置的采样和保持功能提供A1的输出信号的低通滤波。

4. 发明授权

US4446438A Switched capacitor n-path filter 失效
标题翻译：开关电容n路径滤波器
公开(公告)号：US4446438A
公开(公告)日：1984-05-01
申请号：US314827
申请日：1981-10-26
申请人： Chieh Chang , Man S. Lee
发明人： Chieh Chang , Man S. Lee
IPC分类号： G06G7/186 , H03H19/00 , G06G7/18 , H03B1/00 , H03K5/00
CPC分类号： H03H19/002 , G06G7/1865
摘要： A switched capacitor N-path filter in which all capacitors that introduce delay in the paths, in that they have memory and are characterized such that the new charge flow into each such capacitor during each commutation cycle depends on the old charge on it from the previous commutation cycle, are replaced with an associated plurality of N-commutating capacitors.
摘要翻译：一种开关电容N路径滤波器，其中引入路径中的延迟的所有电容器，因为它们具有存储器并被表征，使得在每个换向循环期间，新的电荷流入每个这样的电容器取决于来自前一个换相周期由相关联的多个N整流电容器代替。

5. 发明授权

US5581279A VGA controller circuitry 失效
标题翻译： VGA控制器电路
公开(公告)号：US5581279A
公开(公告)日：1996-12-03
申请号：US147456
申请日：1993-11-05
申请人： Chieh Chang , Man S. Lee , Alex Lushtak
发明人： Chieh Chang , Man S. Lee , Alex Lushtak
IPC分类号： G09G5/18 , G09G5/36 , G09G5/39
CPC分类号： G09G5/18 , G09G5/363
摘要： The "chip set" of a graphics adapter interface card is reduced to a monolithic integrated circuit that includes a programmable analog clock circuit for producing a video memory clock and a video dot clock. A digital graphics adapter controller is responsive to the video memory clock and the video dot clock to produce a video information stream. A random-access memory is responsive to the video information stream to produce a video display information stream, and a digital-to-analog converter is responsive to the video display information stream to convert the video display information stream to analog signals for application to a video display device.
摘要翻译：图形适配器接口卡的“芯片组”被简化为单片集成电路，其包括用于产生视频存储器时钟和视频点时钟的可编程模拟时钟电路。数字图形适配器控制器响应于视频存储器时钟和视频点时钟来产生视频信息流。随机存取存储器响应于视频信息流以产生视频显示信息流，并且数模转换器响应于视频显示信息流将视频显示信息流转换为模拟信号以应用于视频显示设备。

6. 发明授权

US4507625A Switched capacitor AM modulator/demodulator 失效
标题翻译：开关电容AM调制器/解调器
公开(公告)号：US4507625A
公开(公告)日：1985-03-26
申请号：US392972
申请日：1982-06-28
申请人： Man S. Lee , Chieh Chang
发明人： Man S. Lee , Chieh Chang
IPC分类号： H03C1/00 , H03C1/02 , H03K7/00
CPC分类号： H03C1/00
摘要： A first embodiment of an integrable switched capacitor modulator comprises a differential input operational amplifier A1 having a virtual ground potential impressed on its inverting input terminal; capacitors C1, C2 and C3; and switch means operative for alternately (1) charging C1 with an input voltage while connecting C2 and C3 in series with A1 and across it, respectively, for causing it to produce an inverted version of the input voltage, and (2) discharging C2 and C3 while connecting the sample of the input voltage on C1 across A1 for causing it to output a non-inverted sample of the input voltage. The modulated output signal from A1 is preferably bandpass filtered to eliminate baseband spectral components fed through A1 when C2 is connected in series with the input terminal thereof. In a second embodiment which is insensitive to feedthrough and which requires only two capacitors C1 and C4, the switch means alternately (1) charges C1 with the input voltage while connecting a prior sample of the input voltage on C4 across A1 for causing it to output an inverted sample of the input voltage, and (2) charges C4 with the input signal while connecting the sample of the input voltage on C1across A1 in the opposite polarity for causing it to output a non-inverted sample of the input voltage. This embodiment has particular advantage as a demodulator since the built-in sample-and-hold function provides low pass filtering of the output signal of A1.
摘要翻译：可积分开关电容调制器的第一实施例包括具有在其反相输入端施加的虚拟地电势的差分输入运算放大器A1; 电容器C1，C2和C3; 以及开关装置，用于交替地（1）在输入电压C1和C1串联连接C2和C3的同时连续输入电压C1，使其产生反相的输入电压，以及（2）将C2和 C3，同时将A1上的输入电压的采样连接到A1上，使其输出未反相的输入电压。来自A1的调制输出信号优选地被带通滤波以消除C2与其输入端串联连接时通过A1馈送的基带频谱分量。在对馈通不敏感并且仅需要两个电容器C1和C4的第二实施例中，开关装置交替地（1）将C1与输入电压充电，同时在A1上连接C4上的输入电压的先前采样以使其输出输入电压的反相采样，以及（2）在输入信号的C1反相A1上连接输入电压的样本以使其输出输入电压的非反相样本，对C4进行充电。该实施例作为解调器具有特别的优点，因为内置的采样和保持功能提供A1的输出信号的低通滤波。

7. 发明授权

US4510467A Switched capacitor DSB modulator/demodulator 失效
标题翻译：开关电容器DSB调制器/解调器
公开(公告)号：US4510467A
公开(公告)日：1985-04-09
申请号：US393221
申请日：1982-06-28
申请人： Chieh Chang , Man S. Lee
发明人： Chieh Chang , Man S. Lee
IPC分类号： H03C1/60 , H03K7/00
CPC分类号： H03C1/60
摘要： An integrated single-sideband modulator comprises six integrated capacitors C1-C6 and first switch means alternately connecting C1 and C2 as feedback capacitors across a differential input operational amplifier A1. The amplifier has a virtual ground potential on its inverting input terminal for causing it to operate as a voltage source and render the circuit relatively insensitive to parasitic capacitance effects associated with capacitor plates. Second switch means cooperates with A1, C1 and C2 and is responsive to 4-phase clock signals for driving input capacitors C3-C6 so as to convert first and second quadrature-phase input signal voltages into first and second electrical charge flow signals on the inverting input terminal that are a function of products of representations of the first and second voltages in switch state time intervals and associated pulse trains which have a 90.degree. phase difference therebetween and a repetitive pattern such as +1, +1, -1, -1, etc. The amplifier and feedback capacitors combine the charge signals for producing a single-sideband signal on A1's output terminal. This circuit is converted to a balanced modulator by omitting C5 and C6. In an alternate embodiment of a single sideband modulator that requires only a pair of switched capacitors C11 and C12, a 4-phase switch means alternately charges C11 and C12 with associated ones of the quadrature-phase input signal voltages while alternately connecting C12 and C11 as feedback capacitors across A1, the polarity of each capacitors feedback voltage being reversed each time that capacitor is connected across the amplifier. This circuit is operated as a balanced modulator by omitting one of the capacitors.
摘要翻译：集成的单边带调制器包括六个集成电容器C1-C6和第一开关装置，交替地将C1和C2作为反馈电容器连接在差分输入运算放大器A1上。放大器在其反相输入端子上具有虚拟接地电位，使其作为电压源工作，并使电路对与电容器板相关的寄生电容效应相对不敏感。第二开关装置与A1，C1和C2配合，并且响应于用于驱动输入电容器C3-C6的4相时钟信号，以便将第一和第二正交相输入信号电压转换成反相的第一和第二电荷流动信号输入端子，其是开关状态时间间隔中的第一和第二电压的表示的乘积的函数，以及在其间具有90°相位差的相关联的脉冲串和诸如+1，+1，-1，-1 等等。放大器和反馈电容器组合了用于在A1输出端子上产生单边带信号的电荷信号。该电路通过省略C5和C6转换为平衡调制器。在仅需要一对开关电容器C11和C12的单个边带调制器的替代实施例中，四相开关装置交替地对相关的正交相输入信号电压进行充电C11和C12，同时交替地连接C12和C11作为 A1反馈电容器，每个电容器的反馈电压的极性在电容器跨过放大器连接时反转。该电路通过省略其中一个电容器作为平衡调制器工作。

8. 发明授权

US4507626A Switched capacitor SSB modulator 失效
标题翻译：开关电容器SSB调制器
公开(公告)号：US4507626A
公开(公告)日：1985-03-26
申请号：US392973
申请日：1982-06-28
申请人： Chieh Chang , Man S. Lee
发明人： Chieh Chang , Man S. Lee
IPC分类号： H03C1/62 , H03C1/02 , H03K7/00
CPC分类号： H03C1/62
摘要： An integrated single-sideband modulator comprises six integrated capacitors C1-C6 and first switch means alternately connecting C1 and C2 as feedback capacitors across a differential input operational amplifier A1. The amplifier has a virtual ground potential on its inverting input terminal for causing it to operate as a voltage source and render the circuit relatively insensitive to parasitic capacitance effects associated with capacitor plates. Second switch means cooperates with A1, C1 and C2 and is responsive to 4-phase clock signals for driving input capacitors C3-C6 so as to convert first and second quadrature-phase input signal voltages into first and second electrical charge flow signals on the inverting input terminal that are a function of products of representations of the first and second voltages in switch state time intervals and associated pulse trains which have a 90.degree. phase difference therebetween and a repetitive pattern such as +1, +1, -1, -1, etc. The amplifier and feedback capacitors combine the charge signals for producing a single-sideband signal on A1's output terminal. This circuit is converted to a balanced modulator by omitting C5 and C6. In an alternate embodiment of a single sideband modulator that requires only a pair of switched capacitors C11 and C12, a 4-phase switch means alternately charges C11 and C12 with associated ones of the quadrature-phase input signal voltages while alternately connecting C12 and C11 as feedback capacitors across A1, the polarity of each capacitors feedback voltage being reversed each time that capacitor is connected across the amplifier. This circuit is operated as a balanced modulator by omitting one of the capacitors.
摘要翻译：集成的单边带调制器包括六个集成电容器C1-C6和第一开关装置，交替地将C1和C2作为反馈电容器连接在差分输入运算放大器A1上。放大器在其反相输入端子上具有虚拟接地电位，使其作为电压源工作，并使电路对与电容器板相关的寄生电容效应相对不敏感。第二开关装置与A1，C1和C2配合，并且响应于用于驱动输入电容器C3-C6的4相时钟信号，以便将第一和第二正交相输入信号电压转换成反相的第一和第二电荷流动信号输入端子，其是开关状态时间间隔中的第一和第二电压的表示的乘积的函数，以及在其间具有90°相位差的相关联的脉冲串和诸如+1，+1，-1，-1 等等。放大器和反馈电容器组合了用于在A1输出端子上产生单边带信号的电荷信号。该电路通过省略C5和C6转换为平衡调制器。在仅需要一对开关电容器C11和C12的单个边带调制器的替代实施例中，四相开关装置交替地对相关的正交相输入信号电压进行充电C11和C12，同时交替地连接C12和C11作为 A1反馈电容器，每个电容器的反馈电压的极性在电容器跨过放大器连接时反转。该电路通过省略其中一个电容器作为平衡调制器工作。

9. 发明申请

US20080144799A1 Module and Method for Automatically Detecting and Switching between FXO and FXS Interfaces via Single RJ11 审中-公开
标题翻译：通过单个RJ11自动检测和切换FXO和FXS接口的模块和方法
公开(公告)号：US20080144799A1
公开(公告)日：2008-06-19
申请号：US11949499
申请日：2007-12-03
申请人： Chieh Chang , Kenneth Wisheng Ouyang , Yin-Kun Huang , Kuan-Hsi Chen , Chih-Sheng Hsu
发明人： Chieh Chang , Kenneth Wisheng Ouyang , Yin-Kun Huang , Kuan-Hsi Chen , Chih-Sheng Hsu
IPC分类号： H04M3/00
CPC分类号： H04M7/0069
摘要： A module and method for automatically detecting and switching between FXO and FXS interfaces via a single RJ11 is disclosed. The module comprises a RJ11 jack, a USB controller, a modem element, a SLIC module and a DAA module, wherein the USB controller is electrically coupled with a computer for automatically detecting whether a PSTN phone line or a traditional telephone is plugged into the RJ11 jack. According to the detection, the telephone can be connected to the Internet for making and answering a VoIP call via the computer; the computer can be connected to the Internet for making and answering a VoIP call via the modem element; or the computer can make/answer a call to/from the PSTN.
摘要翻译：公开了一种用于通过单个RJ11自动检测和切换FXO和FXS接口的模块和方法。该模块包括RJ11插孔，USB控制器，调制解调器元件，SLIC模块和DAA模块，其中USB控制器与计算机电连接，用于自动检测PSTN电话线路或传统电话机是否插入RJ11 插口。根据检测，电话可以连接到互联网，用于通过计算机进行VoIP应答; 计算机可以通过调制解调器元件连接到互联网进行和接听VoIP呼叫; 或者计算机可以拨打/接听来自PSTN的呼叫。

10. 发明授权

US10131903B2 Microfluidic platform for synthetic biology applications 有权
公开(公告)号：US10131903B2
公开(公告)日：2018-11-20
申请号：US13437727
申请日：2012-04-02
申请人： Chieh Chang , Rajiv Bharadwaj , Anup K. Singh , Aarthi Chandrasekaran , Nathan J. Hillson
发明人： Chieh Chang , Rajiv Bharadwaj , Anup K. Singh , Aarthi Chandrasekaran , Nathan J. Hillson
IPC分类号： C12P19/34 , C12N15/10 , C12N15/66 , C12N15/00 , C12P21/06
摘要： This invention provides methods and compositions for assembling biological constructs (e.g., plasmids, transformed cells, etc.). In certain embodiments the methods involve encapsulating separate components of the biological construct each in a fluid droplet confined in a fluid channel; optionally mixing droplets from different fluid channels to form a sequenced order of droplets carrying different components of the biological construct in a channel or chamber; and optionally combining two or more droplets each containing different components of the biological construct to permit the components to react with each other in one or more reactions contributing to the assembly of the biological construct.

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