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1. 发明授权

US06924761B2 Differential digital-to-analog converter 失效
标题翻译：差分数模转换器
公开(公告)号：US06924761B2
公开(公告)日：2005-08-02
申请号：US10601038
申请日：2003-06-19
申请人： Xuewen Jiang , Bobby B. Nikjou , Waleed Khalil , Syed R. Naqvi
发明人： Xuewen Jiang , Bobby B. Nikjou , Waleed Khalil , Syed R. Naqvi
IPC分类号： H03M1/06 , H03M1/68 , H03M1/76 , H03M1/78
CPC分类号： H03M1/0682 , H03M1/687 , H03M1/765 , H03M1/785
摘要： Briefly, in accordance with one embodiment of the invention, a differential digital-to-analog converter utilized in a transmitter path of a transceiver utilizes a differential R2R architecture. Such a differential digital-to-analog converter may be utilized in higher speed, lower power and higher resolution applications with a higher area efficiency, for example in a WCDMA application.
摘要翻译：简而言之，根据本发明的一个实施例，在收发器的发射机路径中使用的差分数模转换器利用差分R2R架构。这种差分数模转换器可以用于具有较高面积效率的更高速度，更低功率和更高分辨率的应用中，例如在WCDMA应用中。

2. 发明授权

US07242338B2 Differential digital-to-analog converter 失效
标题翻译：差分数模转换器
公开(公告)号：US07242338B2
公开(公告)日：2007-07-10
申请号：US11195301
申请日：2005-08-02
申请人： Xuewen Jiang , Bobby B. Nikjou , Waleed Khalil , Syed R. Naqvi
发明人： Xuewen Jiang , Bobby B. Nikjou , Waleed Khalil , Syed R. Naqvi
IPC分类号： H03M1/78
CPC分类号： H03M1/0682 , H03M1/687 , H03M1/765 , H03M1/785
摘要： Briefly, in accordance with one embodiment of the invention, a differential digital-to-analog converter utilized in a transmitter path of a transceiver utilizes a differential R2R architecture. Such a differential digital-to-analog converter may be utilized in higher speed, lower power and higher resolution applications with a higher area efficiency, for example in a WCDMA application.
摘要翻译：简而言之，根据本发明的一个实施例，在收发器的发射机路径中使用的差分数模转换器利用差分R2R架构。这种差分数模转换器可以用于具有较高面积效率的更高速度，更低功率和更高分辨率的应用中，例如在WCDMA应用中。

3. 发明申请

US20050270216A1 Differential digital-to-analog converter 失效
公开(公告)号：US20050270216A1
公开(公告)日：2005-12-08
申请号：US11195301
申请日：2005-08-02
申请人： Xuewen Jiang , Bobby Nikjou , Waleed Khalil , Syed Naqvi
发明人： Xuewen Jiang , Bobby Nikjou , Waleed Khalil , Syed Naqvi
IPC分类号： H03M1/06 , H03M1/68 , H03M1/76 , H03M1/78 , H03M1/12
CPC分类号： H03M1/0682 , H03M1/687 , H03M1/765 , H03M1/785
摘要： Briefly, in accordance with one embodiment of the invention, a differential digital-to-analog converter utilized in a transmitter path of a transceiver utilizes a differential R2R architecture. Such a differential digital-to-analog converter may be utilized in higher speed, lower power and higher resolution applications with a higher area efficiency, for example in a WCDMA application.

4. 发明授权

US07050781B2 Self-calibrating tunable filter 有权
标题翻译：自校准可调谐滤波器
公开(公告)号：US07050781B2
公开(公告)日：2006-05-23
申请号：US10146740
申请日：2002-05-16
申请人： Waleed Khalil , Tsung-Yuan Chang , Bobby Nikjou
发明人： Waleed Khalil , Tsung-Yuan Chang , Bobby Nikjou
IPC分类号： H04B1/10
CPC分类号： H04B1/28 , H03J2200/10 , H03J2200/29
摘要： Some embodiments of the present invention include a circuit in a wireless transmitter or other apparatus is automatically calibrated using a calibration circuit to accommodate provide a desired characteristic such as a filter response, where the component values of the filter circuit may vary such as in an integrated circuit. In one embodiment, the calibration circuit is coupled to one or more adjustable capacitors in the filter circuit to select a capacitor value so that the filter circuit exhibits the desired filter response. In one particular embodiment, the adjustable capacitor is charged in an RC circuit for each clock cycle at power up. The value of the adjustable capacitor is changed for each clock cycle until the capacitor charges to a level greater than or equal to predetermined reference voltage. When the capacitor is charged to a predetermined reference voltage, a desired capacitance value is indicated, and the adjustable capacitor is maintained at the desired capacitance value to provide the desired filter output. The calibration circuit causes the circuit to be self-calibrating to the desired characteristic such as a desired filter response. Other embodiments are described and claimed.
摘要翻译：本发明的一些实施例包括无线发射机中的电路或其他设备使用校准电路自动校准以适应提供期望的特性，例如滤波器响应，其中滤波器电路的分量值可以变化，例如集成电路。在一个实施例中，校准电路耦合到滤波器电路中的一个或多个可调节电容器，以选择电容器值，使得滤波器电路呈现期望的滤波器响应。在一个特定实施例中，在加电时，每个时钟周期，可调电容器在RC电路中充电。每个时钟周期改变可调电容器的值，直到电容器充电到大于或等于预定参考电压的电平。当电容器被充电到预定的参考电压时，指示期望的电容值，并且可调电容器被保持在期望的电容值以提供期望的滤波器输出。校准电路使得电路自校准到期望的特性，例如期望的滤波器响应。描述和要求保护其他实施例。

5. 发明授权

US6008673A High speed, low power, current mode comparator 有权
标题翻译：高速，低功耗，电流模式比较器
公开(公告)号：US6008673A
公开(公告)日：1999-12-28
申请号：US265217
申请日：1999-03-04
申请人： Kevin W. Glass , Waleed Khalil , Bart R. McDaniel
发明人： Kevin W. Glass , Waleed Khalil , Bart R. McDaniel
IPC分类号： G11C7/06 , H03K5/24 , H03M1/36 , H03K5/22
CPC分类号： H03M1/366 , G11C7/062 , H03K5/2481 , H03K5/249 , G11C2207/063
摘要： A current regenerative comparator. A pair of cross coupled inverters are coupled to an equalizing transistor, an input current mirror and a reference current mirror, such that current flowing in the input current mirror is compared to the current flowing in the reference current mirror.
摘要翻译：一个当前的再生比较器。一对交叉耦合的反相器耦合到均衡晶体管，输入电流镜和参考电流镜，使得在输入电流镜中流动的电流与在参考电流镜中流动的电流相比较。

6. 发明授权

US06621437B2 Multiplexed digital-to-analog converters used in communication devices 失效
标题翻译：在通信设备中使用的多路复用数模转换器
公开(公告)号：US06621437B2
公开(公告)日：2003-09-16
申请号：US10043725
申请日：2002-01-08
申请人： Waleed Khalil , Chunlei Shi , James Wilson
发明人： Waleed Khalil , Chunlei Shi , James Wilson
IPC分类号： H03M166
CPC分类号： H03M1/662
摘要： A system includes a transceiver having mixers, variable gain amplifiers, a modulator, a local oscillator and power amplifiers that may receive control signals generated by a Digital-to-Analog Converter (DAC). The DAC may include a multiplexer that receives digital values that are transferred to a DAC core, converted to analog values, and stored in sample-and-hold circuits. The one DAC may service multiple devices within the transceiver with control signals. A smart timer may generate select signals to the multiplexer and sample-and hold circuits to prioritize updating of the control signals.
摘要翻译：一种系统包括具有混频器，可变增益放大器，调制器，本地振荡器和可以接收由数模转换器（DAC）产生的控制信号的功率放大器的收发器。 DAC可以包括多路复用器，其接收传送到DAC核心的数字值，转换为模拟值，并存储在采样和保持电路中。一个DAC可以利用控制信号为收发器内的多个设备提供服务。智能定时器可以向多路复用器产生选择信号，并采样和保持电路优先考虑控制信号的更新。

7. 发明授权

US07302246B2 Programmable gain amplifier with self-adjusting offset correction 有权
标题翻译：具有自调整偏移校正功能的可编程增益放大器
公开(公告)号：US07302246B2
公开(公告)日：2007-11-27
申请号：US10329187
申请日：2002-12-23
申请人： James Tseng , Waleed Khalil , Bobby Nikjou , Luke A. Johnson
发明人： James Tseng , Waleed Khalil , Bobby Nikjou , Luke A. Johnson
IPC分类号： H04B1/06
CPC分类号： H03F3/45973 , H03F2203/45591
摘要： Briefly, in accordance with one embodiment of the invention, a calibration circuit may detect a difference between first and second outputs of a differential output programmable gain amplifier to determine a dc offset at the differential output. In the event an offset is detected, a differential gain of the programmable gain amplifier may be adjusted until the offset is adjusted, or eliminated, to an acceptable predetermined value.
摘要翻译：简而言之，根据本发明的一个实施例，校准电路可以检测差分输出可编程增益放大器的第一和第二输出之间的差异，以确定差分输出处的直流偏移。在检测到偏移的情况下，可以调节可编程增益放大器的差分增益，直到偏移被调整或消除为可接受的预定值。

8. 发明授权

US07034623B2 Voltage controlled oscillator apparatus, method, and system 有权
标题翻译：压控振荡器装置，方法和系统
公开(公告)号：US07034623B2
公开(公告)日：2006-04-25
申请号：US10729629
申请日：2003-12-05
申请人： Waleed Khalil
发明人： Waleed Khalil
IPC分类号： H03B27/00
CPC分类号： H03B5/1228 , H03B5/1215 , H03B5/1243
摘要： A voltage controlled oscillator includes two gain stages to split the bias current and reduce phase noise.
摘要翻译：压控振荡器包括两个增益级，以分离偏置电流并减少相位噪声。

9. 发明授权

US06975846B2 Method and circuit to reduce intermodulation distortion 失效
标题翻译：减少互调失真的方法和电路
公开(公告)号：US06975846B2
公开(公告)日：2005-12-13
申请号：US10155893
申请日：2002-05-23
申请人： Tsung Yuan Chang , Waleed Khalil , Bobby Nikjou
发明人： Tsung Yuan Chang , Waleed Khalil , Bobby Nikjou
IPC分类号： H04B1/10 , H04B1/00
CPC分类号： H04B1/109
摘要： Briefly, in accordance with an embodiment of the invention, a method and circuit to reduce intermodulation distortion is provided, wherein the method includes receiving a baseband signal and an interferer signal located in a frequency band and attenuating the interferer signal to reduce intermodulation distortion in the frequency band, wherein the attenuating occurs prior to anti-alias filtering of the baseband signal.
摘要翻译：简而言之，根据本发明的一个实施例，提供了一种减少互调失真的方法和电路，其中该方法包括接收位于频带中的基带信号和干扰信号，并且衰减干扰信号，以减少干扰信号中的互调失真频带，其中衰减发生在基带信号的抗混叠滤波之前。

10. 发明申请

US20050122180A1 Voltage controlled oscillator apparatus, method, and system 有权
标题翻译：压控振荡器装置，方法和系统
公开(公告)号：US20050122180A1
公开(公告)日：2005-06-09
申请号：US10729629
申请日：2003-12-05
申请人： Waleed Khalil
发明人： Waleed Khalil
IPC分类号： H03B5/00 , H03B5/12
CPC分类号： H03B5/1228 , H03B5/1215 , H03B5/1243
摘要： A voltage controlled oscillator includes two gain stages to split the bias current and reduce phase noise.
摘要翻译：压控振荡器包括两个增益级，以分离偏置电流并减少相位噪声。

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