-
公开(公告)号：US06909390B2
公开(公告)日：2005-06-21
申请号：US10670160
申请日：2003-09-23
CPC分类号： H03M1/0678 , H03M1/0863 , H03M1/66
摘要： A digital-to-analog converter circuit for a subscriber line analog front end includes a differential amplifier, switch circuitry, and first and second current steering digital-to-analog converters (DAC), each DAC having a first and second output forming a differential DAC output. The switch circuitry couples the differential output of at most a selected one of the first and second DACs to a pair of switch nodes. When the differential output of the selected DAC is coupled to the pair of switch nodes, the differential output of the other DAC is shorted. A differential input of the differential amplifier is communicatively coupled to the pair of switch nodes. A differential output of the differential amplifier is coupled to drive a tip line and a ring line of a subscriber line. In various embodiments, the DACs, switch circuitry, and differential amplifier reside on the same semiconductor substrate.
摘要翻译： 用于用户线模拟前端的数模转换器电路包括差分放大器，开关电路和第一和第二电流转向数模转换器（DAC），每个DAC具有形成差分的第一和第二输出 DAC输出。 开关电路将至少一个第一和第二DAC中的一个的差分输出耦合到一对开关节点。 当所选DAC的差分输出耦合到该对开关节点时，另一DAC的差分输出短路。 差分放大器的差分输入通信地耦合到该对交换节点。 差分放大器的差分输出被耦合以驱动用户线的尖端线和环线。 在各种实施例中，DAC，开关电路和差分放大器驻留在相同的半导体衬底上。
-
32.发明申请Communication terminal with low carrier feedthrough and communication system using such a terminal 审中-公开具有低载波馈通的通信终端和使用这种终端的通信系统公开(公告)号：US20050020217A1
公开(公告)日：2005-01-27
申请号：US10626063
申请日：2003-07-23
CPC分类号： H04B1/0475 , H03F1/34 , H03F3/24 , H04B2001/0433 , H04L2027/0016 , H04L2027/0018
摘要： communication terminal (710) includes a coder (722, 724) receiving an input signal and having an output terminal for providing a coded signal; an upconverter core (100) having an input terminal for receiving a first signal having predetermined spectral content at an input frequency and an output terminal for providing an output signal having substantially the predetermined spectral content at a higher frequency using a local oscillator signal having a carrier frequency; an electrical measurement circuit having an input terminal coupled to the output terminal of the upconverter core (100), and an output terminal for providing a first offset correction signal representative of a power of the output signal at the carrier frequency; and a summing device (406) having a positive input terminal for receiving the coded signal, a negative input terminal coupled to the output terminal of the electrical measurement circuit, and an output terminal coupled to the input terminal of the upconverter core (100).
摘要翻译： 通信终端（710）包括接收输入信号并具有用于提供编码信号的输出端的编码器（722,724） 具有用于接收在输入频率处具有预定频谱含量的第一信号的输入端的上变频器内核（100）和用于使用具有载波的本地振荡器信号以较高频率提供具有基本上预定频谱含量的输出信号的输出端 频率; 电测量电路，其具有耦合到所述上变频器内核（100）的输出端的输入端，以及输出端，用于提供表示所述载波频率处的所述输出信号的功率的第一偏移校正信号; 和具有用于接收编码信号的正输入端的求和装置（406），耦合到电测量电路的输出端的负输入端和耦合到上变频器芯（100）的输入端的输出端。
-
公开(公告)号：US06639534B2
公开(公告)日：2003-10-28
申请号：US10076087
申请日：2002-02-14
IPC分类号： H03M166
CPC分类号： H03M1/0678 , H03M1/0863 , H03M1/66
摘要： A digital-to-analog conversion circuit includes first and second DACs. Switch circuitry couples a selected output of only one of the DACs to an output node at any given time. In one embodiment, a second output of the first DAC is coupled to the first output of the second DAC at a common node. The first output of the first DAC is coupled to a first switch node and a second output of the second DAC is coupled to a second switch node. A first switch couples the common node to the first switch node in response to a first switch signal. A second switch couples the common node to the second switch node in response to a second switch signal. The switch signals ensure that the common node is coupled through the first and second switches to only one of the first and second switch nodes at any given time.
摘要翻译： 数模转换电路包括第一和第二DAC。 在任何给定的时间，开关电路将选择的仅一个DAC的输出耦合到输出节点。 在一个实施例中，第一DAC的第二输出在公共节点处耦合到第二DAC的第一输出。 第一DAC的第一输出耦合到第一开关节点，并且第二DAC的第二输出耦合到第二开关节点。 第一开关响应于第一开关信号将公共节点耦合到第一开关节点。 响应于第二开关信号，第二开关将公共节点耦合到第二开关节点。 开关信号确保在任何给定时间，公共节点通过第一和第二开关耦合到仅第一和第二开关节点中的一个。
-
34.发明授权
公开(公告)号：US5986281A
公开(公告)日：1999-11-16
申请号：US956409
申请日：1997-10-23
CPC分类号： G01R31/2858
摘要： A circuit and method for detecting mobile ion contamination in a semiconductor device. The circuit uses two transistor structures on the same silicon chip as the circuit being tested to detect the presence (or absence) of mobile ions. The test includes imposing conditions on the silicon chip that may cause any mobile ions present therein to move within the structure. By measuring electrical parameters, such as a band gap voltage, across the transistors before and after the imposition of such conditions, a reliable indication of the presence or absence of mobile ions can be obtained.
摘要翻译： 一种用于检测半导体器件中的移动离子污染的电路和方法。 该电路在与被测电路相同的硅芯片上使用两个晶体管结构来检测移动离子的存在（或不存在）。 测试包括在硅芯片上施加可能导致其中存在的任何移动离子在结构内移动的条件。 通过在施加这种条件之前和之后测量跨越晶体管的电参数，例如带隙电压，可以获得是否存在移动离子的可靠指示。
-
公开(公告)号：US09094634B2
公开(公告)日：2015-07-28
申请号：US13910392
申请日：2013-06-05
申请人： Yu Su , Mustafa H. Koroglu , Ruifeng Sun , Krishna Pentakota , Pio Balmelli , Ramin Khoini-Poorfard
发明人： Yu Su , Mustafa H. Koroglu , Ruifeng Sun , Krishna Pentakota , Pio Balmelli , Ramin Khoini-Poorfard
摘要： An amplifier includes a negative gain amplifier, a load element, and a transconductance device. The negative gain amplifier has an input and an output. The load element has a first terminal coupled to a power supply voltage terminal, and a second terminal. The transconductance device has a first current electrode coupled to the second terminal of the load element, a control electrode coupled to the output of the negative gain amplifier, and a second current electrode coupled to the input of the negative gain amplifier.
摘要翻译： 放大器包括负增益放大器，负载元件和跨导器件。 负增益放大器具有输入和输出。 负载元件具有耦合到电源电压端子的第一端子和第二端子。 跨导器件具有耦合到负载元件的第二端子的第一电流电极，耦合到负增益放大器的输出的控制电极和耦合到负增益放大器的输入的第二电流电极。
-
公开(公告)号：US08781428B2
公开(公告)日：2014-07-15
申请号：US12715728
申请日：2010-03-02
CPC分类号： H03L7/06
摘要： A frequency synthesizer includes a controlled oscillator configured to extend a temperature range and phase noise of the synthesizer without compromising the frequency coverage of the synthesizer. The frequency synthesizer also includes bias generation circuitry that sets a bias current of a charge pump to reduce bandwidth variations of the synthesizer. The frequency synthesizer further includes switching circuitry to dynamically turn a charge pump on and off to reduce effects of current leakage in the charge pump.
摘要翻译： 频率合成器包括受控振荡器，其被配置为在不损害合成器的频率覆盖的情况下延长合成器的温度范围和相位噪声。 频率合成器还包括偏置产生电路，其设置电荷泵的偏置电流以减少合成器的带宽变化。 频率合成器还包括开关电路，以动态地打开和关闭电荷泵，以减少电荷泵中电流泄漏的影响。
-
37.发明申请公开(公告)号：US20110244820A1
公开(公告)日：2011-10-06
申请号：US13160564
申请日：2011-06-15
申请人： Ramin Khoini-Poorfard , Alessandro Piovaccari , Aslamali A. Rafi , Mustafa H. Koroglu , David S. Trager , Abdulkerim L. Coban
发明人： Ramin Khoini-Poorfard , Alessandro Piovaccari , Aslamali A. Rafi , Mustafa H. Koroglu , David S. Trager , Abdulkerim L. Coban
摘要： An integrated wideband receiver includes first and second signal processing paths and a controller. The first signal processing path has an input, and an output for providing a first processed signal, and comprises a first tracking bandpass filter having a first integrated inductor. The second signal processing path has an input, and an output for providing a second processed signal, and comprises a second tracking bandpass filter having a second integrated inductor. The controller is for enabling one of the first and second signal processing paths corresponding to a selected channel of a radio frequency (RF) input signal to provide an output signal. The controller, the first integrated inductor, and said second integrated inductor are formed on a single integrated circuit chip.
摘要翻译： 集成宽带接收机包括第一和第二信号处理路径和控制器。 第一信号处理路径具有输入和用于提供第一处理信号的输出，并且包括具有第一集成电感器的第一跟踪带通滤波器。 第二信号处理路径具有输入和用于提供第二处理信号的输出，并且包括具有第二集成电感器的第二跟踪带通滤波器。 控制器用于启用与射频（RF）输入信号的选定信道相对应的第一和第二信号处理路径之一以提供输出信号。 控制器，第一集成电感器和所述第二集成电感器形成在单个集成电路芯片上。
-
38.发明申请公开(公告)号：US20100130155A1
公开(公告)日：2010-05-27
申请号：US12277908
申请日：2008-11-25
IPC分类号： H04B1/06
CPC分类号： H04B15/06 , H03J2200/10 , H04N5/44 , H04N5/4446
摘要： A receiver (400) includes a tracking bandpass filter (420), a tunable lowpass filter (434), a local oscillator (442), and a mixer (444). The tracking bandpass filter (420) has an input for receiving a radio frequency (RF) input signal, and an output. The tunable lowpass filter (434) has an input coupled to the output of the tracking bandpass filter (420), and an output. The local oscillator (422) has a first output for providing a local oscillator signal, which is characterized as being a square wave signal at the desired intermediate frequency (IF). The mixer (444) has a first input coupled to the output of the tunable lowpass filter (434), a second input coupled to the output of the local oscillator (442), and a first output for providing an IF signal at the desired IF. The tunable lowpass filter (434) is configured to substantially attenuate a third harmonic of the frequency of the local oscillator signal.
摘要翻译： 接收器（400）包括跟踪带通滤波器（420），可调谐低通滤波器（434），本地振荡器（442）和混频器（444）。 跟踪带通滤波器（420）具有用于接收射频（RF）输入信号和输出的输入。 可调谐低通滤波器（434）具有耦合到跟踪带通滤波器（420）的输出的输入和输出。 本地振荡器（422）具有用于提供本地振荡器信号的第一输出，其被表征为在期望的中频（IF）下的方波信号。 混频器（444）具有耦合到可调谐低通滤波器（434）的输出的第一输入端，耦合到本地振荡器（442）的输出端的第二输入端和用于在期望的IF 。 可调谐低通滤波器（434）被配置为基本上衰减本地振荡器信号的频率的三次谐波。
-
39.发明授权公开(公告)号：US07599673B2
公开(公告)日：2009-10-06
申请号：US11240814
申请日：2005-09-30
申请人： Adrian Maxim , Ramin Khoini-Poorfard , James Kao
发明人： Adrian Maxim , Ramin Khoini-Poorfard , James Kao
IPC分类号： H04B1/18
CPC分类号： H04N7/20 , H03D3/006 , H03D3/007 , H03J1/0066 , H03K3/0322 , H03L7/18 , H04H40/90 , H04N5/4401 , H04N5/4446 , H04N5/50 , H04N21/4263
摘要： A technique includes receiving a signal spectrum that includes a plurality of channels within a first frequency range. The technique includes receiving a selection signal that identifies at least one desired channel to be tuned. The technique includes providing an oscillator that has a second frequency range that is substantially the same as the first frequency range and controlling the oscillators to generate one of a plurality of coarse-tune analog mixing signals. The signals substantially span across the second frequency range and each depends upon the location of the desired channel within the signal spectrum. The technique includes mixing the signal spectrum with the selected coarse-tune analog mixing signal to generate a coarsely tuned signal spectrum. The technique includes digitally processing the coarsely-tuned signal spectrum to fine tune the desired channel and to produce digital baseband signals for the desired channel.
摘要翻译： 一种技术包括在第一频率范围内接收包括多个信道的信号频谱。 该技术包括接收标识要调谐的至少一个期望信道的选择信号。 该技术包括提供具有与第一频率范围基本相同的第二频率范围的振荡器，并且控制振荡器以产生多个粗调模拟混合信号之一。 信号基本跨越第二频率范围，并且每个信号取决于信号频谱内期望信道的位置。 该技术包括将信号频谱与所选择的粗调模拟混合信号混合以产生粗调谐信号频谱。 该技术包括对粗调谐信号频谱进行数字处理以微调所需信道并产生所需信道的数字基带信号。
-
40.发明授权Multi-tuner integrated circuit architecture utilizing frequency isolated local oscillators and associated method 有权使用频率隔离的本地振荡器的多调谐器集成电路架构及相关方法公开(公告)号：US07447491B2
公开(公告)日：2008-11-04
申请号：US10456215
申请日：2003-06-06
IPC分类号： H04B1/10
摘要： Integrated multiple tuner architectures and associated methods are disclosed that utilize frequency isolated local oscillators (LO). These architectures utilize dividers and multipliers within the signal paths for the local oscillator mixing signals to reduce interference among the multiple local oscillators operating on a single integrated circuit. A multiple tuner direct-down-conversion (DDC) receiver and a multiple tuner intermediate frequency (IF) receiver are provided as example embodiments. And an example integrated multi-tuner satellite receiver is also described.
摘要翻译： 公开了利用频率隔离的本地振荡器（LO）的集成多调谐器架构和相关联的方法。 这些架构在本地振荡器混合信号的信号路径内使用分频器和乘法器，以减少在单个集成电路上工作的多个本地振荡器之间的干扰。 作为示例实施例，提供了多调谐器直接下变频（DDC）接收机和多调谐器中频（IF）接收机。 并且还描述了一个集成的多调谐器卫星接收机的示例。
-
-
-
-
-
-
-
-
-
搜索结果
55 条记录 (耗时 0.03 秒)
