公开(公告)号：US4507626A

公开(公告)日：1985-03-26

申请号：US392973

申请日：1982-06-28

Applicant: Chieh Chang ,  Man S. Lee

Inventor： Chieh Chang ,  Man S. Lee

IPC: H03C1/62 ,  H03C1/02 ,  H03K7/00

CPC classification number: H03C1/62

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US20070223455A1

公开(公告)日：2007-09-27

申请号：US11501803

申请日：2006-08-10

Applicant: Chieh Chang ,  Wi-Sheng Ou Yang ,  Kuan-Hsi Chen ,  Lun-Chieh Lo

Inventor： Chieh Chang ,  Wi-Sheng Ou Yang ,  Kuan-Hsi Chen ,  Lun-Chieh Lo

IPC: H04L12/66

CPC classification number: H04M7/0057

Abstract: A method of switching between a VoIP call and a traditional call, involving the use of a caller terminal, a call box device, a first computer device, a second computer device, and a receiver terminal. A VoIP connection has to be established before the caller terminal and the receiver terminal can engage in a VoIP call. If the VoIP connection is successfully established, a computer device electrically connected to the caller terminal monitors the Internet quality between the caller terminal and the receiver terminal. If the Internet quality is poor, upon the pressing of a predetermined key, the caller terminal alternatively connects to the receiver terminal via a PSTN call through the switching of the call box device, which is electrically connected to the receiver terminal.

Abstract translation: 一种在VoIP呼叫和传统呼叫之间切换的方法，涉及使用呼叫者终端，呼叫盒装置，第一计算机装置，第二计算机装置和接收机终端。 在呼叫者终端和接收方终端可以进行VoIP呼叫之前，必须建立VoIP连接。 如果VoIP连接成功建立，则电连接到主叫终端的计算机设备监视主叫终端和接收者终端之间的因特网质量。 如果互联网质量差，则按预定键，呼叫者终端通过电话连接到接收终端的呼叫盒装置的切换，经由PSTN呼叫交替地连接到接收终端。

公开(公告)号：US06851014B2

公开(公告)日：2005-02-01

申请号：US10104944

申请日：2002-03-22

Applicant: Chieh Chang ,  Jianhui Xie ,  Deqi Gao

Inventor： Chieh Chang ,  Jianhui Xie ,  Deqi Gao

IPC: G06F12/00 ,  G06F13/42

CPC classification number: G06F13/4243

Abstract: A memory device includes a memory array, a first protocol circuit, a second protocol circuit, an operation interface, and a protocol detection circuit. The first protocol circuit, which implements a first communication protocol, and the second protocol circuit, which implements a second communication protocol, are coupled in parallel between the memory array and the operation interface. The protocol detection circuit, which is coupled to the operation interface and to the first and second protocol circuits, monitors control signals provided to the operation interface by a host controller to determine which communication protocol the host controller employs. In response thereto, the protocol detection circuit selects one of the first and second protocol circuits to handles communication between the host controller and the memory device.

Abstract translation: 存储器件包括存储器阵列，第一协议电路，第二协议电路，操作接口和协议检测电路。 实现第一通信协议的第一协议电路和实现第二通信协议的第二协议电路并联在存储器阵列和操作接口之间。 耦合到操作接口和第一和第二协议电路的协议检测电路监视由主机控制器提供给操作接口的控制信号，以确定主机控制器采用的通信协议。 响应于此，协议检测电路选择第一和第二协议电路中的一个来处理主机控制器和存储设备之间的通信。

公开(公告)号：US5581279A

公开(公告)日：1996-12-03

申请号：US147456

申请日：1993-11-05

Applicant: Chieh Chang ,  Man S. Lee ,  Alex Lushtak

Inventor： Chieh Chang ,  Man S. Lee ,  Alex Lushtak

IPC: G09G5/18 ,  G09G5/36 ,  G09G5/39

CPC classification number: G09G5/18 ,  G09G5/363

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US4507625A

公开(公告)日：1985-03-26

申请号：US392972

申请日：1982-06-28

Applicant: Man S. Lee ,  Chieh Chang

Inventor： Man S. Lee ,  Chieh Chang

IPC: H03C1/00 ,  H03C1/02 ,  H03K7/00

CPC classification number: H03C1/00

Abstract: 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.

Abstract translation: 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。