Bandgap reference circuit with improved output reference voltage
    2.
    发明授权
    Bandgap reference circuit with improved output reference voltage 失效
    带隙参考电路具有改进的输出参考电压

    公开(公告)号:US4896094A

    公开(公告)日:1990-01-23

    申请号:US375098

    申请日:1989-06-30

    IPC分类号: G05F3/26 G05F3/28

    CPC分类号: G05F3/267

    摘要: A bandgap reference circuit providing a continuous output reference voltage. The bandgap reference circuit comprises an operational amplifier, an output circuit, and a compensation circuit. The operational amplifier receives a first input signal and a second input signal and provides an output signal in response to a difference in voltage between the first input signal and the second input signal. The output circuit receives the output of the operational amplifier and provides an output reference voltage. The output circuit provides the first input signal and the second input signal to the operational amplifier in such a way as to maintain the output reference voltage at a substantially constant value. The compensation circuit provides a current to the output circuit to compensate for currents conducted from the bases of transistors in an input stage of the operational amplifier, thereby making the output reference voltage more stable.

    摘要翻译: 提供连续输出参考电压的带隙基准电路。 带隙基准电路包括运算放大器,输出电路和补偿电路。 运算放大器接收第一输入信号和第二输入信号,并响应于第一输入信号和第二输入信号之间的电压差而提供输出信号。 输出电路接收运算放大器的输出并提供输出参考电压。 输出电路以将维持输出参考电压保持在基本恒定的方式将第一输入信号和第二输入信号提供给运算放大器。 补偿电路向输出电路提供电流以补偿从运算放大器的输入级中的晶体管的基极传导的电流,从而使输出参考电压更稳定。

    Method and apparatus for frequency domain ripple compensation for a
communications transmitter
    3.
    发明授权
    Method and apparatus for frequency domain ripple compensation for a communications transmitter 失效
    用于通信发射机的频域纹波补偿的方法和装置

    公开(公告)号:US5825826A

    公开(公告)日:1998-10-20

    申请号:US724097

    申请日:1996-09-30

    摘要: A data stream to be transmitted is received by a digital interface (52) and converted into a frequency encoded data. A gains block (54) receives the frequency encoded data and a gain adjustment signal, and produces a gain adjusted data to compensate for undesirable system level passband gain variation. The gain adjusted data is converted to a time domain data. The time domain data is processed by a high-pass and a droop correction filter (58, 59) to produce a filtered data. The filtered data is provided through an analog front-end (60) in order to provide a filtered analog data.

    摘要翻译: 要发送的数据流由数字接口(52)接收并转换成频率编码数据。 增益块(54)接收频率编码数据和增益调整信号,并产生增益调整数据以补偿不期望的系统级通带增益变化。 增益调整后的数据被转换为时域数据。 时域数据由高通和下垂校正滤波器(58,59)处理以产生滤波数据。 滤波后的数据通过模拟前端(60)提供,以便提供经滤波的模拟数据。

    Cascaded integrator-comb interpolation filter
    4.
    发明授权
    Cascaded integrator-comb interpolation filter 失效
    级联积分梳内插滤波器

    公开(公告)号:US5880687A

    公开(公告)日:1999-03-09

    申请号:US806271

    申请日:1997-02-25

    CPC分类号: H04L27/0002 H03H17/0671

    摘要: A cascaded integrator-comb (CIC) interpolation filter is included within a digital-to-analog converter (138) and includes two up-samplers (150, 164). The two up-samplers (150, 164) also include a sample-and-hold function. The first up-sampler (150) up-samples an output of a differentiator (140). The second up-sampler (164) up-samples an output of an integrator (152) This reduces the area and power requirements of the CIC interpolation filter, while providing approximately the same filtering performance in the pass band and transition band. The total over-sample ratio of the CIC interpolation filter is equal to the first up-sampling ratio multiplied by the second up-sampling ratio. The stop band requirements of the CIC interpolation filter determines the relative sizes of the first and second up-sampling ratios.

    摘要翻译: 级联积分梳(CIC)插值滤波器包括在数模转换器(138)内,并且包括两个上采样器(150,164)。 两个上采样器(150,164)还包括采样保持功能。 第一上采样器(150)对微分器(140)的输出进行上采样。 第二个上采样器(164)对积分器(152)的输出进行上采样。这降低了CIC内插滤波器的面积和功率需求,同时在通带和过渡频带中提供了大致相同的滤波性能。 CIC内插滤波器的总超采样比等于第一个上采样比乘以第二上采样比。 CIC插值滤波器的阻带要求决定了第一和第二上采样比的相对尺寸。

    Memory with serial input-output terminals for address and data and method therefor
    5.
    发明授权
    Memory with serial input-output terminals for address and data and method therefor 有权
    具有串行输入输出端子的存储器,用于地址和数据及其方法

    公开(公告)号:US07474585B2

    公开(公告)日:2009-01-06

    申请号:US11736231

    申请日:2007-04-17

    IPC分类号: G11C8/00

    摘要: A memory (10) has a plurality of memory cells, a serial address port (47) for receiving a low voltage high frequency differential address signal, and a serial input/output data port (52, 54) for receiving a high frequency low voltage differential data signal. The memory (10) can operate in one of two different modes, a normal mode and a cache line mode. In cache line mode, the memory can access an entire cache line from a single address. A fully hidden refresh mode allows for timely refresh operations while operating in cache line mode. Data is stored in the memory array (14) by interleaving in multiple sub-arrays (15, 17). During a hidden refresh mode of operation, one sub-array (15) is accessed while another sub-array (17) is refreshed. Two or more of the memories (10) may be chained together to provide a high speed low power memory system.

    摘要翻译: 存储器(10)具有多个存储单元,用于接收低电压高频差分地址信号的串行地址端口(47)和用于接收高频低电压的串行输入/输出数据端口(52,54) 差分数据信号。 存储器(10)可以以两种不同模式之一工作,即正常模式和高速缓存行模式。 在高速缓存行模式下,内存可以从单个地址访问整个高速缓存行。 完全隐藏的刷新模式允许在高速缓存线模式下运行时进行及时的刷新操作。 数据通过在多个子阵列(15,17)中交错存储在存储器阵列(14)中。 在隐藏的刷新操作模式期间,一个子阵列(15)被访问,而另一个子阵列(17)被刷新。 两个或多个存储器(10)可以链接在一起以提供高速低功率存储器系统。

    Circuit for controlling data communication with synchronous storage circuitry and method of operation
    6.
    发明授权
    Circuit for controlling data communication with synchronous storage circuitry and method of operation 有权
    用于控制与同步存储电路的数据通信的电路和操作方法

    公开(公告)号:US07859299B1

    公开(公告)日:2010-12-28

    申请号:US12500975

    申请日:2009-07-10

    IPC分类号: H03K17/16 G11C7/10

    摘要: A method and circuit includes providing at least one conductor for receiving an input signal. A termination circuit and a clamp circuit are coupled to the at least one conductor. The termination circuit is enabled while the clamp circuit remains enabled. The clamp circuit is disabled. After disabling the clamp circuit, while the termination circuit remains enabled, both a first differential comparator and a second differential comparator are enabled. The first differential comparator receives a first differential input signal at a first input and a second differential input signal at a second input. The second differential comparator detects when a difference between the first differential input signal and the second differential input signal is greater than a predetermined value and enables transfer of an output of the first differential comparator to a memory controller.

    摘要翻译: 方法和电路包括提供用于接收输入信号的至少一个导体。 终端电路和钳位电路耦合到至少一个导体。 当钳位电路保持使能时,使能端接电路。 钳位电路被禁止。 禁用钳位电路后,当终端电路保持使能时,第一个差分比较器和第二个差分比较器都使能。 第一差分比较器在第一输入端接收第一差分输入信号,在第二输入端接收第二差分输入信号。 第二差分比较器检测第一差分输入信号和第二差分输入信号之间的差是否大于预定值,并且能够将第一差分比较器的输出传送到存储器控制器。

    Memory with serial input/output terminals for address and data and method therefor
    7.
    发明授权
    Memory with serial input/output terminals for address and data and method therefor 有权
    具有用于地址和数据的串行输入/输出端子的存储器及其方法

    公开(公告)号:US07221613B2

    公开(公告)日:2007-05-22

    申请号:US10854554

    申请日:2004-05-26

    IPC分类号: G11C8/00

    摘要: A memory (10) has a plurality of memory cells, a transceiver (56) for receiving a low voltage high frequency differential address signal, and a serial input/output data port (52, 54) for receiving a high frequency low voltage differential data signal. The memory (10) can operate in one of two different modes, a normal mode and a cache line mode. In cache line mode, the memory can access an entire cache line from a single address. A fully hidden refresh mode allows for timely refresh operations while operating in cache line mode. Data is scored in the memory array (14) by interleaving in multiple sub-arrays (15, 17). During a hidden refresh mode of operation, one sub-array (15) is accessed while another sub-array (17) is refreshed. Two or more of the memories (10) may be chained together to provide a high speed low power memory system.

    摘要翻译: 存储器(10)具有多个存储单元,用于接收低电压高频差分地址信号的收发器(56)和用于接收高频低电压差分数据的串行输入/输出数据端口(52,54) 信号。 存储器(10)可以以两种不同模式之一工作,即正常模式和高速缓存行模式。 在高速缓存行模式下,内存可以从单个地址访问整个高速缓存行。 完全隐藏的刷新模式允许在高速缓存线模式下运行时进行及时的刷新操作。 通过在多个子阵列(15,17)中进行交织,在存储器阵列(14)中记录数据。 在隐藏的刷新操作模式期间,一个子阵列(15)被访问,而另一个子阵列(17)被刷新。 两个或多个存储器(10)可以链接在一起以提供高速低功率存储器系统。

    Dual tone detector operable in the presence of speech or background
noise and method therefor
    8.
    发明授权
    Dual tone detector operable in the presence of speech or background noise and method therefor 失效
    在存在语音或背景噪声的情况下可操作的双音检测器及其方法

    公开(公告)号:US5408529A

    公开(公告)日:1995-04-18

    申请号:US70611

    申请日:1993-06-02

    申请人: Carlos A. Greaves

    发明人: Carlos A. Greaves

    IPC分类号: H04Q1/45 H04Q1/46 H04M1/50

    CPC分类号: H04Q1/46

    摘要: A dual tone detector (100) for a single dual tone, a dual tone multi-frequency (DTMF), or similar system processes an input signal through both bandpass (103) and band reject (104) tone detectors. If both the bandpass (103) and band reject (104) tone detectors detect a tone, then the dual tone detector (100) provides a tone detect output signal. If only the bandpass tone detector (103), which is susceptible to false tones, detects a tone, then a voice input signal is muted and the tone detector (100) activates the tone detect output signal only if both the bandpass (103) and band reject (104) tone detectors subsequently detect a tone. In one embodiment, a dual bandpass/band reject tone detector (120) processes the input signal through shared front-end band reject filters (121, 122), limiters (124), resonators (127, 128), and a processing section (130) in order to save circuit area. Limiter and peak detector functions are also implemented in shared circuitry to further reduce circuit area.

    摘要翻译: 用于单个双音,双音多频(DTMF)或类似系统的双音检测器(100)通过带通(103)和带阻(104)音检测器处理输入信号。 如果带通(103)和频带抑制(104)音检测器检测到音调,则双音检测器(100)提供音检测输出信号。 如果只有容易受到假音调的带通音检测器(103)检测到音调,则声音输入信号被静音,并且只有当带通(103)和 频带拒绝(104)音调检测器随后检测音调。 在一个实施例中,双带通/频带拒绝音检测器(120)通过共享的前端带阻滤波器(121,122),限制器(124),谐振器(127,128)和处理部分 130),以节省电路面积。 限制器和峰值检测器功能也在共享电路中实现,以进一步减少电路面积。

    Differential input-single output two pole filter implemented by a single
amplifier
    9.
    发明授权
    Differential input-single output two pole filter implemented by a single amplifier 失效
    由单个放大器实现的差分输入单输出双极滤波器

    公开(公告)号:US4782305A

    公开(公告)日:1988-11-01

    申请号:US104008

    申请日:1987-10-02

    IPC分类号: H03H11/04 H03F1/34

    CPC分类号: H03H11/04

    摘要: An analog two pole filter is provided which uses a single amplifier to implement a predetermined transfer function. The filter has a differential input and converts the two inputs to a single output utilizing the same amplifier which performs the filtering function. By coupling a capacitor across the differential input and utilizing the differential aspect of the input signals, the capacitor may be implemented with half the capacitance otherwise required to implement the predetermined transfer function, thereby minimizing circuit area.

    摘要翻译: 提供了一种使用单个放大器来实现预定传输功能的模拟双极滤波器。 滤波器具有差分输入,并使用执行滤波功能的相同放大器将两个输入转换为单个输出。 通过将电容器跨越差分输入并利用输入信号的差分方面,电容器可以用实现预定传递函数所需的一半电容来实现,从而最小化电路面积。

    Network message processing using inverse pattern matching
    10.
    发明授权
    Network message processing using inverse pattern matching 有权
    使用逆模式匹配的网络消息处理

    公开(公告)号:US07240041B2

    公开(公告)日:2007-07-03

    申请号:US10721196

    申请日:2003-11-25

    IPC分类号: G06F17/00 G06N5/02

    摘要: Hashing and pattern matching are used in an information processing system to process incoming messages from a network such as an Ethernet-based network. Using hashing and pattern matching increases the efficiency of message acceptance and rejection without increasing software-based processor tasks. A hash function and a pattern matching function are performed on a message received by an information processing system, and the message is selectively accepted based on at least one of a hash result and a pattern matching result. The incoming message can be searched for the existence of patterns and the absence of the patterns. The incoming message can be searched for the existence of multiple patterns. The results of pattern matching can be used not only for acceptance and rejection of messages, but also for other post-receipt tasks such as selective storage of incoming messages according to identified relative priorities or absolute criticality of messages having particular pattern matches.

    摘要翻译: 在信息处理系统中使用散列和模式匹配来处理来自诸如以太网的网络之类的网络的传入消息。 使用散列和模式匹配增加了消息接受和拒绝的效率,而不增加基于软件的处理器任务。 对由信息处理系统接收到的消息执行散列函数和模式匹配功能,并且基于散列结果和模式匹配结果中的至少一个选择性地接受该消息。 可以搜索传入的消息中的模式的存在和模式的缺失。 可以搜索输入的消息以存在多个模式。 模式匹配的结果不仅可以用于消息的接受和拒绝,而且可以用于其他后接收任务,例如根据所识别的相对优先级或具有特定模式匹配的消息的绝对关键性选择性地存储传入消息。