Filter
    1.
    发明授权
    Filter 失效
    过滤

    公开(公告)号:US5764100A

    公开(公告)日:1998-06-09

    申请号:US800008

    申请日:1997-02-13

    CPC分类号: H03H11/0455

    摘要: A transconductance filter (200) comprises multiple stages of a transconductor (110,120,130) having an input and an output, and a switch (260,265,270) coupled between the output and the voltage source. The switch is operatively responsive to the control signal for coupling and decoupling the voltage source directly to the output of the transconductor at least prior to the time the filter is required to filter the input voltage signal. The voltage source is within a predetermined input voltage range of the transconductor defined by a region in which a transconductance of the transconductor is substantially constant and positive.

    摘要翻译: 跨导滤波器(200)包括具有输入和输出的多级跨导体(110,120,130)和耦合在输出端和电压源之间的开关(260,265,270)。 至少在需要滤波器以过滤输入电压信号之前,该开关可操作地响应于控制信号,用于将电压源直接耦合到去耦到跨导体的输出。 电压源在由跨导体的跨导基本上恒定且为正的区域限定的跨导体的预定输入电压范围内。

    Method, apparatus, and system for common mode feedback circuit using switched capacitors
    2.
    发明授权
    Method, apparatus, and system for common mode feedback circuit using switched capacitors 有权
    使用开关电容器的共模反馈电路的方法,装置和系统

    公开(公告)号:US06573785B1

    公开(公告)日:2003-06-03

    申请号:US10038482

    申请日:2002-01-03

    IPC分类号: H03F102

    摘要: According to one aspect of the invention, an apparatus is provided which includes a first amplifier and a common mode feedback circuit. The first amplifier includes a first input, a second input, a first output, and a second output. The first input and the second input are coupled to receive a first input voltage and a second input voltage, respectively. The first and second outputs provide a first output voltage and a second output voltage, respectively. The common mode feedback circuit has first and second switched capacitors coupled to provide a common mode feedback signal based on the first and second output voltages to the first and second inputs of first amplifier.

    摘要翻译: 根据本发明的一个方面,提供一种包括第一放大器和共模反馈电路的装置。 第一放大器包括第一输入,第二输入,第一输出和第二输出。 第一输入和第二输入分别耦合以接收第一输入电压和第二输入电压。 第一和第二输出分别提供第一输出电压和第二输出电压。 共模反馈电路具有第一和第二开关电容器,其耦合以基于第一和第二输出电压向第一放大器的第一和第二输入提供共模反馈信号。

    Method and apparatus for integrating a plurality of analog input signals
prior to transmitting a communications signal
    3.
    发明授权
    Method and apparatus for integrating a plurality of analog input signals prior to transmitting a communications signal 失效
    用于在发送通信信号之前对多个模拟输入信号进行积分的方法和装置

    公开(公告)号:US5634202A

    公开(公告)日:1997-05-27

    申请号:US149486

    申请日:1993-11-09

    CPC分类号: H03H19/004

    摘要: A method and apparatus for integrating a plurality of analog input signals. A first integrator(725) having a first pole frequency integrates a first of the input signals and a second integrator(730) having a second pole frequency different than the first pole frequency integrates a second of the input signals. A summer(735) is connected to the first and second integrators to then sum the integrated first and second signals and provide a composite integrated signal prior to transmitting a communications signal.

    摘要翻译: 一种用于集成多个模拟输入信号的方法和装置。 具有积分第一输入信号的第一积分器(725)和具有与第一极点频率不同的第二极点频率的第二积分器(730)积分第二输入信号。 夏天(735)连接到第一和第二积分器,然后对集成的第一和第二信号求和,并在发送通信信号之前提供复合的积分信号。

    Radio telephone and method for operating a radiotelephone in slotted
paging mode
    5.
    发明授权
    Radio telephone and method for operating a radiotelephone in slotted paging mode 失效
    无线电话和方法,用于在时分页方式中操作无线电话

    公开(公告)号:US5910944A

    公开(公告)日:1999-06-08

    申请号:US808555

    申请日:1997-02-28

    摘要: Prior to entry into a low-power sleep mode, a radiotelephone (104) in a radiotelephone system (100) calculates in advance the timing required to wake up selected portions of the radiotelephone and stores the calculated wakeup times in registers (216). Also prior to entry into sleep mode, local timing of the radiotelephone is synchronized to received PN roll boundaries from the radiotelephone system. In the sleep mode, the radiotelephone uses a sleep timer (210) to simulate system timing. When the sleep timer (210) matches the stored wakeup times, the radiotelephone re-activates the selected portions of the radiotelephone, such as an oscillator (116) and a radio frequency portion (109) of an analog front end (108), to exit the sleep mode and reacquire communication with the system. This also permits an early exit from sleep mode, for example to service an interrupt, while maintaining system timing.

    摘要翻译: 在进入低功率睡眠模式之前,无线电话系统(100)中的无线电话(104)预先计算唤醒无线电话机的所选部分所需的定时,并将所计算的唤醒时间存储在寄存器(216)中。 此外,在进入睡眠模式之前,无线电话机的本地定时被同步到从无线电话系统接收的PN卷边界。 在睡眠模式中,无线电话机使用睡眠定时器(210)来模拟系统定时。 当睡眠定时器(210)匹配所存储的唤醒时间时,无线电话机重新激活诸如模拟前端(108)的振荡器(116)和射频部分(109)的无线电话机的所选部分, 退出睡眠模式并重新获取与系统的通信。 这也允许早期退出睡眠模式,例如在维护系统时序的同时服务中断。